Tuned port injection problems

Nov 02, 2008 · The 2 vacuum ports that come out of the rear of the upper plenum on the passengers side get brittle and break, check there for a vacuum leak. Also check for a vacuum leak around the throttlebody butterfly shafts, spray a little carb cleaner where the shafts go into the TB and listen for a change in RPM. Chevrolets Tuned Port Fuel Injection System, or TPI as it is more commonly referred to, first appeared on production vehicles in 1985 and, since then, has been used on all Corvettes and on many specially equipped Camaros and Firebirds. GM advertising claims of up to a 20% improvement in torque, horsepower and mileage, over equivalent carbureted ...Jun 30, 2011 · 1989 corvette tuned port injection. Problem : car cold starts and runs great but once warmed up will not restart until about a 30 to 45 min cool down. Two local Chevy dealers say they cannot read computer and believes prob is an electrical heat resistance prob and may need a new distributor as fuel flow has proven not to be the prob. Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. Aug 24, 2004 · Basics for fixing common problems with Tuned Port Induction. Cam Benty Writer. Aug 24, 2004. When the Tuned Port fuel-injection system arrived in 1985, it was asignificant improvement on the ... Aug 24, 2004 · The Tuned Port MAF sensor is a sensitive piece of equipment thatincorporates a thin piece of wire that reads air intake and reports tothe computer the current air conditions. If the wire is damaged... Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. Jan 03, 2022 · Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet. When using the 1987-92 F-Body injection systems, the two center bolts on each side will not fit the earlier engines without being re-drilled for the proper angle to match the early heads. Also 1985-88 manifold plenums have a cold-start passage and ninth injector for start-up.May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... Jun 30, 2011 · 1989 corvette tuned port injection. Problem : car cold starts and runs great but once warmed up will not restart until about a 30 to 45 min cool down. Two local Chevy dealers say they cannot read computer and believes prob is an electrical heat resistance prob and may need a new distributor as fuel flow has proven not to be the prob. In this video I go into detail regarding the vacuum circuit of the GM TPI fuel injection system and show what vehicle systems it controls.Be sure to check ou... May 09, 2020 · Engine malfunction light appears or service engine light. Reduced power and performance. 5. EcoTec3 and Active Fuel Management Problems. One of the biggest issue with the 5.3L vortec, and really all vortec engines for that matter, was excessive oil consumption caused by the active fuel management system. Mar 07, 2009 · The injectors could be stuck open, but all the right side are electrically connected together, same with the left. Both sides are ground controlled. There would be ALOT of fuel running into the engine, engine would hydrolock. The fuel pump relay is ecm controlled (ground), also the oil pressure switch is a redundant power supply to the pump. Oct 22, 2015 · when the minimal throttle position sensor voltage is not at 0.53 closed.. your computer may think you are in clear flood mode.. reducing the injector pulse width to almost nothing while cranking. when the minimum voltage varies.. you will not drop into the idle fuel control settings with the injectors at 1.2 to 1.4ms. they will be up around 2.1 … Aug 24, 2004 · Basics for fixing common problems with Tuned Port Induction. Cam Benty Writer. Aug 24, 2004. When the Tuned Port fuel-injection system arrived in 1985, it was asignificant improvement on the ... I have a 1986 Corvette with a 5.7L v8 L98 tuned port injection engine. Usually when i start the car, it idles around 7 to 8rpm on the dash, but lately, after driving the car, when i slow down, the car just dies. It can run fine one minute, then when stopped at a red light, the rpm will drow down to 6, then 5, down to 3, back to 5, and die.Jul 12, 2008 · The first step is to remove the plenum from the runners. This includes the throttle body as well. At this point, it can be removed as one unit. You can also drain the coolant from the engine and... May 09, 2020 · Engine malfunction light appears or service engine light. Reduced power and performance. 5. EcoTec3 and Active Fuel Management Problems. One of the biggest issue with the 5.3L vortec, and really all vortec engines for that matter, was excessive oil consumption caused by the active fuel management system. Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. Part one of the TPI tear down and rebuild on the VetteSource 1988 Yellow Gold Firebird Formula 350. In this video I detail the removal of the air intake, thr...Porting the intake, adding a larger throttle body and runners, and higher flow injectors will help a high performance engine. But, just as a high- flowing carburetor can be too big for a mild to...May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money Aug 24, 2004 · Basics for fixing common problems with Tuned Port Induction. Cam Benty Writer. Aug 24, 2004. When the Tuned Port fuel-injection system arrived in 1985, it was asignificant improvement on the ... Aug 24, 2004 · The Tuned Port MAF sensor is a sensitive piece of equipment thatincorporates a thin piece of wire that reads air intake and reports tothe computer the current air conditions. If the wire is damaged... verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your …Mar 07, 2009 · The injectors could be stuck open, but all the right side are electrically connected together, same with the left. Both sides are ground controlled. There would be ALOT of fuel running into the engine, engine would hydrolock. The fuel pump relay is ecm controlled (ground), also the oil pressure switch is a redundant power supply to the pump. Aug 24, 2004 · Basics for fixing common problems with Tuned Port Induction. Cam Benty Writer. Aug 24, 2004. When the Tuned Port fuel-injection system arrived in 1985, it was asignificant improvement on the ... Tuned Port Injection was introduced back in 1985, and was used on Camaros and Firebirds by GM up until 1992. The Corvettes used it up until 1991, as they moved on to the LT1 in 92. ... ECM number 16198259 is equivalent and can be used in its place without any problems. The same computer was used both for 305 and for 350 engines. The only ...Dec 09, 2014 · have an s10 built and swapped a 383 stroker and dropped it in. converted to tuned port injection off of a 86 camaro non VATS. New fuel pump, and relays, new #24 injectors, new MAF, New knock, new elec … May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve.Oct 22, 2015 · when the minimal throttle position sensor voltage is not at 0.53 closed.. your computer may think you are in clear flood mode.. reducing the injector pulse width to almost nothing while cranking. when the minimum voltage varies.. you will not drop into the idle fuel control settings with the injectors at 1.2 to 1.4ms. they will be up around 2.1 … world market sectional verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your …Joined Nov 22, 1999 10,164 Posts #9 · Feb 23, 2000 15-coolant temp low 22-throttle position sensor signal voltage low. 23-manifold temp sensor circut low 34- map sensor signal voltage low. Check your grounds, the engine and computer. check bat voltage. All these circuts can't be bad. JimM Premium Member Joined Dec 7, 1999 22,122 PostsAug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. Using direct injection also allows your car's engine computer to allow greater control of where and how much fuel is injected into the engine cylinder. This typically means that an engine equipped with direct injection will get better gas mileage than an engine equipped with port injection. Direct injection is the newer technology and why it ...224/224 Dur. Hyd. Flat Tappet Cam 1955-86 SBC ... Essentially this is our flat tappet version of our ZZ409 cam. Specs are 224/224 Dur. @ .050 .47...Nov 02, 2008 · The 2 vacuum ports that come out of the rear of the upper plenum on the passengers side get brittle and break, check there for a vacuum leak. Also check for a vacuum leak around the throttlebody butterfly shafts, spray a little carb cleaner where the shafts go into the TB and listen for a change in RPM. Feb 26, 2004 · Speed density is preferable for many reasons. First, although the TPI units through the years remained about the same, the computers kept getting smarter. GM hasn't updated the '85-89 MAF computer ... Options include working R134 A/C with new compressor, power steering, power disc brakes, windows, mirrors, driver's seat and door locks. Rally gauges includi... Feb 19, 2009 · verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your … Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. 224/224 Dur. Hyd. Flat Tappet Cam 1955-86 SBC ... Essentially this is our flat tappet version of our ZZ409 cam. Specs are 224/224 Dur. @ .050 .47...Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet.May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money Options include working R134 A/C with new compressor, power steering, power disc brakes, windows, mirrors, driver's seat and door locks. Rally gauges includi... Jan 10, 2018 · The throttle bodies could flow the air. Compression was up and a more aggressive cam was installed from the factory. Even choked with catalytic converters, the exhaust flowed respectably thanks to header-like manifolds. The problem was that GM shrank the size of the intake runners down to just 2/3rds of the size of the intake ports. 1988 camaro iroc z 350 tune port injected. need to reset timing on the computer. jodie To set the ignition timing you will need to disconnect the electronic timing control. It is usually a dark brown and black wire located on the passenger side foot well where the carpet meets the firewall. yfz450r handlebars Feb 26, 2004 · Speed density is preferable for many reasons. First, although the TPI units through the years remained about the same, the computers kept getting smarter. GM hasn't updated the '85-89 MAF computer ... Jan 10, 2018 · The throttle bodies could flow the air. Compression was up and a more aggressive cam was installed from the factory. Even choked with catalytic converters, the exhaust flowed respectably thanks to header-like manifolds. The problem was that GM shrank the size of the intake runners down to just 2/3rds of the size of the intake ports. Feb 26, 2004 · Speed density is preferable for many reasons. First, although the TPI units through the years remained about the same, the computers kept getting smarter. GM hasn't updated the '85-89 MAF computer ... ''Corvette Experience''Corvette C4 Automatic Tuned Port Injection.Engine: 5.7 L V8 Year: 1987 Welcome to Harris Performance, this site dealing with the TPI Tune Port Injection system used by GM from 1985 through 1992. I have posted pages to help those with these systems overcome the limitations of those systems and point out what those limitations are. While I specialize more in the daily driver type fuel injection aspects rather than ...Computer-controlled engines benefit from improved fuel mileage and crisp throttle response derived from accurate control of the fuel and spark curves. In 1985, GM introduced its Tuned Port...1988 camaro iroc z 350 tune port injected. need to reset timing on the computer. jodie To set the ignition timing you will need to disconnect the electronic timing control. It is usually a dark brown and black wire located on the passenger side foot well where the carpet meets the firewall. 1988 camaro iroc z 350 tune port injected. need to reset timing on the computer. jodie To set the ignition timing you will need to disconnect the electronic timing control. It is usually a dark brown and black wire located on the passenger side foot well where the carpet meets the firewall. Oct 21, 2008 · TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve. Welcome to Harris Performance, this site dealing with the TPI Tune Port Injection system used by GM from 1985 through 1992. I have posted pages to help those with these systems overcome the limitations of those systems and point out what those limitations are. While I specialize more in the daily driver type fuel injection aspects rather than ...I have a 87 Iroc 305 Tuned Port Injection that is having some nasty issues. The engine starts without issues, however it will attempt to die at idle if you do not keep you're foot on the gas. It also smells like it is running really rich. At highway speeds, it seems fine, but driving around the city is horrible.May 09, 2020 · Engine malfunction light appears or service engine light. Reduced power and performance. 5. EcoTec3 and Active Fuel Management Problems. One of the biggest issue with the 5.3L vortec, and really all vortec engines for that matter, was excessive oil consumption caused by the active fuel management system. May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... Using direct injection also allows your car's engine computer to allow greater control of where and how much fuel is injected into the engine cylinder. This typically means that an engine equipped with direct injection will get better gas mileage than an engine equipped with port injection. Direct injection is the newer technology and why it ...91 Camaro 350 tuned port injection will not start. fuel pressure good, injectors pulse, timing and spark good. - Answered by a verified Chevy Mechanic. ... It looks like I will have to buy a new set. I think the computer is good, but can't be sure until I get the injector problem fixed. There is also a slim possibility that the distributor ...Symptoms of excessive carbon build-up on the FA20 turbo direct injection engine include: Misfires Rough idle Stuttering / hesitation Power loss Misfires are typically the start of the problems with carbon deposits on the intake valves. You’ll also likely notice rough idling and stuttering or hesitation while accelerating. May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... A: The Tuned Port Injection engines in these cars have a reputation for developing both vacuum leaks and dirty throttle bodies. Either of these can cause the idle and off-idle stumble problems you're having. We recommend looking at both to find a solution to your problem. Also, be sure to check your fuel pressure. It should be 36 psi at idle.Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. Symptoms of excessive carbon build-up on the FA20 turbo direct injection engine include: Misfires Rough idle Stuttering / hesitation Power loss Misfires are typically the start of the problems with carbon deposits on the intake valves. You’ll also likely notice rough idling and stuttering or hesitation while accelerating. Feb 19, 2009 · verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your … Jan 03, 2022 · Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet. Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. The first production TUNED PORT INJECTION (TPI) appeared on General Motors vehicles in 1985. ... Sequential Central Port Injection is a standard on the 4.3L/4300, 5.0L/5000 L30, 5.7L/5700L31, and 7.4L/7400 L29 engines. ... what we make we offer tech support and are familiar with the problems you encounter and can diagnose and take care of ...Tuned Port Injection was introduced back in 1985, and was used on Camaros and Firebirds by GM up until 1992. The Corvettes used it up until 1991, as they moved on to the LT1 in 92. ... ECM number 16198259 is equivalent and can be used in its place without any problems. The same computer was used both for 305 and for 350 engines. The only ...In this video I go into detail regarding the vacuum circuit of the GM TPI fuel injection system and show what vehicle systems it controls.Be sure to check ou... Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... In this video I go into detail regarding the vacuum circuit of the GM TPI fuel injection system and show what vehicle systems it controls.Be sure to check ou... 224/224 Dur. Hyd. Flat Tappet Cam 1955-86 SBC ... Essentially this is our flat tappet version of our ZZ409 cam. Specs are 224/224 Dur. @ .050 .47...I have a 87 Iroc 305 Tuned Port Injection that is having some nasty issues. The engine starts without issues, however it will attempt to die at idle if you do not keep you're foot on the gas. It also smells like it is running really rich. At highway speeds, it seems fine, but driving around the city is horrible.Aug 24, 2004 · The Tuned Port MAF sensor is a sensitive piece of equipment thatincorporates a thin piece of wire that reads air intake and reports tothe computer the current air conditions. If the wire is damaged... When using the 1987-92 F-Body injection systems, the two center bolts on each side will not fit the earlier engines without being re-drilled for the proper angle to match the early heads. Also 1985-88 manifold plenums have a cold-start passage and ninth injector for start-up.I have a 1986 Corvette with a 5.7L v8 L98 tuned port injection engine. Usually when i start the car, it idles around 7 to 8rpm on the dash, but lately, after driving the car, when i slow down, the car just dies. It can run fine one minute, then when stopped at a red light, the rpm will drow down to 6, then 5, down to 3, back to 5, and die.When using the 1987-92 F-Body injection systems, the two center bolts on each side will not fit the earlier engines without being re-drilled for the proper angle to match the early heads. Also 1985-88 manifold plenums have a cold-start passage and ninth injector for start-up.May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... 05-11-14 09:01 AM - Post# 2451974 In response to 65_Impala AS always its a test and isolate deal where your forced to test the function of components to verify each until you find the faulty component,the TPI efi fuel injection system, was on chevy engines from 1985-1991-it was designed to run on 37-42 psi fuel pressure the fuel pump should provide a minimum of 42 psi and the fuel pressure ...what weve checked: verified that the motor was timed on the compression stroke. verified firing order. verified wiring to the hei was correct. motor starts to run a little better at about 30 degrees advanced, but we cant crank more into it due to the coil hitting the intake. weve checked and double checked everything, goig so far as to hook up …Oct 22, 2015 · when the minimal throttle position sensor voltage is not at 0.53 closed.. your computer may think you are in clear flood mode.. reducing the injector pulse width to almost nothing while cranking. when the minimum voltage varies.. you will not drop into the idle fuel control settings with the injectors at 1.2 to 1.4ms. they will be up around 2.1 … Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet.05-11-14 09:01 AM - Post# 2451974 In response to 65_Impala AS always its a test and isolate deal where your forced to test the function of components to verify each until you find the faulty component,the TPI efi fuel injection system, was on chevy engines from 1985-1991-it was designed to run on 37-42 psi fuel pressure the fuel pump should provide a minimum of 42 psi and the fuel pressure ...Symptoms of excessive carbon build-up on the FA20 turbo direct injection engine include: Misfires Rough idle Stuttering / hesitation Power loss Misfires are typically the start of the problems with carbon deposits on the intake valves. You’ll also likely notice rough idling and stuttering or hesitation while accelerating. External Ignition Wiring The R pin is the HEI module’s tach output. Connect it to pin 24 on the Megasquirt main board, or the Tach pin on the relay board. Note that the DIY Autotune wiring harness has a shielded wire – connect only the inner wire to this pin! Connect the E pin to MS3X pin 14 to send the timing signal to the HEI module. I have a 87 Iroc 305 Tuned Port Injection that is having some nasty issues. The engine starts without issues, however it will attempt to die at idle if you do not keep you're foot on the gas. It also smells like it is running really rich. At highway speeds, it seems fine, but driving around the city is horrible.May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money Jan 10, 2018 · The throttle bodies could flow the air. Compression was up and a more aggressive cam was installed from the factory. Even choked with catalytic converters, the exhaust flowed respectably thanks to header-like manifolds. The problem was that GM shrank the size of the intake runners down to just 2/3rds of the size of the intake ports. Joined Nov 22, 1999 10,164 Posts #9 · Feb 23, 2000 15-coolant temp low 22-throttle position sensor signal voltage low. 23-manifold temp sensor circut low 34- map sensor signal voltage low. Check your grounds, the engine and computer. check bat voltage. All these circuts can't be bad. JimM Premium Member Joined Dec 7, 1999 22,122 PostsAug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. There were two especially notable high performers for the 305 Chevy engine, the L69 High Output 5.0 engine and the LB9 Tuned Port Injection 5.0 engine. This is in keeping with their placement in high-performance sports cars to deliver plenty of power to the wheels when the driver needed it most. ... 1979 Buick Regal Limited 5.0 High Output ...Aug 24, 2004 · The Tuned Port MAF sensor is a sensitive piece of equipment thatincorporates a thin piece of wire that reads air intake and reports tothe computer the current air conditions. If the wire is damaged... Oct 21, 2008 · TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve. May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... 05-11-14 09:01 AM - Post# 2451974 In response to 65_Impala AS always its a test and isolate deal where your forced to test the function of components to verify each until you find the faulty component,the TPI efi fuel injection system, was on chevy engines from 1985-1991-it was designed to run on 37-42 psi fuel pressure the fuel pump should provide a minimum of 42 psi and the fuel pressure ...Under Pressure. Back in 1992, General Motors introduced a new type of fuel injection system known as "Central Port Injection" (CPI), which GM also refers to as "Central Multi-point Fuel Injection" (CMFI). The system was used on 4.3L V6 Vortec engines through 1995, and was redesigned in 1996 and renamed "Central Sequential Fuel ...Computer-controlled engines benefit from improved fuel mileage and crisp throttle response derived from accurate control of the fuel and spark curves. In 1985, GM introduced its Tuned Port...I have a 1986 Corvette with a 5.7L v8 L98 tuned port injection engine. Usually when i start the car, it idles around 7 to 8rpm on the dash, but lately, after driving the car, when i slow down, the car just dies. It can run fine one minute, then when stopped at a red light, the rpm will drow down to 6, then 5, down to 3, back to 5, and die.Jan 10, 2018 · The throttle bodies could flow the air. Compression was up and a more aggressive cam was installed from the factory. Even choked with catalytic converters, the exhaust flowed respectably thanks to header-like manifolds. The problem was that GM shrank the size of the intake runners down to just 2/3rds of the size of the intake ports. Feb 26, 2004 · Speed density is preferable for many reasons. First, although the TPI units through the years remained about the same, the computers kept getting smarter. GM hasn't updated the '85-89 MAF computer ... asian curly hair products Dec 09, 2014 · have an s10 built and swapped a 383 stroker and dropped it in. converted to tuned port injection off of a 86 camaro non VATS. New fuel pump, and relays, new #24 injectors, new MAF, New knock, new elec … Chevrolets Tuned Port Fuel Injection System, or TPI as it is more commonly referred to, first appeared on production vehicles in 1985 and, since then, has been used on all Corvettes and on many specially equipped Camaros and Firebirds. GM advertising claims of up to a 20% improvement in torque, horsepower and mileage, over equivalent carbureted ...Nov 02, 2008 · The 2 vacuum ports that come out of the rear of the upper plenum on the passengers side get brittle and break, check there for a vacuum leak. Also check for a vacuum leak around the throttlebody butterfly shafts, spray a little carb cleaner where the shafts go into the TB and listen for a change in RPM. Apr 27, 2009 · I have a 1989 Chevrolet corvette that runs and idles nice on a cold engine but once the car heats up it runs and idles rough. The car has the 5.7l 350 small block with the Tuned Port Fuel Injection. W … read more Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. Oct 21, 2008 · TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve. May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... Part one of the TPI tear down and rebuild on the VetteSource 1988 Yellow Gold Firebird Formula 350. In this video I detail the removal of the air intake, thr...''Corvette Experience''Corvette C4 Automatic Tuned Port Injection.Engine: 5.7 L V8 Year: 1987 Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet.Feb 26, 2004 · Speed density is preferable for many reasons. First, although the TPI units through the years remained about the same, the computers kept getting smarter. GM hasn't updated the '85-89 MAF computer ... Aug 24, 2004 · Basics for fixing common problems with Tuned Port Induction. Cam Benty Writer. Aug 24, 2004. When the Tuned Port fuel-injection system arrived in 1985, it was asignificant improvement on the ... ''Corvette Experience''Corvette C4 Automatic Tuned Port Injection.Engine: 5.7 L V8 Year: 1987 Tuned Port Injection was introduced back in 1985, and was used on Camaros and Firebirds by GM up until 1992. The Corvettes used it up until 1991, as they moved on to the LT1 in 92. ... ECM number 16198259 is equivalent and can be used in its place without any problems. The same computer was used both for 305 and for 350 engines. The only ...5,277 Posts. #2 · Mar 7, 2009. If you ever suspect a fuel pump isn't working, I'd recommend pulling the fuel pump relay and jumpering the wires from B (+) to the pump supply. The pump should run as long as the jumper is installed. The ECM controls the fuel pump relay.Welcome to Harris Performance, this site dealing with the TPI Tune Port Injection system used by GM from 1985 through 1992. I have posted pages to help those with these systems overcome the limitations of those systems and point out what those limitations are. While I specialize more in the daily driver type fuel injection aspects rather than ...Oct 21, 2008 · TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve. Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet.1988 camaro iroc z 350 tune port injected. need to reset timing on the computer. jodie To set the ignition timing you will need to disconnect the electronic timing control. It is usually a dark brown and black wire located on the passenger side foot well where the carpet meets the firewall.Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. Oct 22, 2015 · when the minimal throttle position sensor voltage is not at 0.53 closed.. your computer may think you are in clear flood mode.. reducing the injector pulse width to almost nothing while cranking. when the minimum voltage varies.. you will not drop into the idle fuel control settings with the injectors at 1.2 to 1.4ms. they will be up around 2.1 … May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... There were two especially notable high performers for the 305 Chevy engine, the L69 High Output 5.0 engine and the LB9 Tuned Port Injection 5.0 engine. This is in keeping with their placement in high-performance sports cars to deliver plenty of power to the wheels when the driver needed it most. ... 1979 Buick Regal Limited 5.0 High Output ...Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet.Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. Welcome to Harris Performance, this site dealing with the TPI Tune Port Injection system used by GM from 1985 through 1992. I have posted pages to help those with these systems overcome the limitations of those systems and point out what those limitations are. While I specialize more in the daily driver type fuel injection aspects rather than ...TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve.Jan 03, 2022 · Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet. Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. A: The Tuned Port Injection engines in these cars have a reputation for developing both vacuum leaks and dirty throttle bodies. Either of these can cause the idle and off-idle stumble problems you're having. We recommend looking at both to find a solution to your problem. Also, be sure to check your fuel pressure. It should be 36 psi at idle.Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. If it just one day started running like garbage, that sounds more like a faulty component, unless of course a vac line got disconnected. Either way all are good suggestions; be sure to give your car a thorough diagnosis and as was stated by others, don't just throw your money away at what you think is wrong. C4TPI Registered Joined May 9, 2011''Corvette Experience''Corvette C4 Automatic Tuned Port Injection.Engine: 5.7 L V8 Year: 1987 I have a 1986 Corvette with a 5.7L v8 L98 tuned port injection engine. Usually when i start the car, it idles around 7 to 8rpm on the dash, but lately, after driving the car, when i slow down, the car just dies. It can run fine one minute, then when stopped at a red light, the rpm will drow down to 6, then 5, down to 3, back to 5, and die.When using the 1987-92 F-Body injection systems, the two center bolts on each side will not fit the earlier engines without being re-drilled for the proper angle to match the early heads. Also 1985-88 manifold plenums have a cold-start passage and ninth injector for start-up.Feb 26, 2004 · Speed density is preferable for many reasons. First, although the TPI units through the years remained about the same, the computers kept getting smarter. GM hasn't updated the '85-89 MAF computer ... Tuned Port Injection was introduced back in 1985, and was used on Camaros and Firebirds by GM up until 1992. The Corvettes used it up until 1991, as they moved on to the LT1 in 92. ... ECM number 16198259 is equivalent and can be used in its place without any problems. The same computer was used both for 305 and for 350 engines. The only ...In this video I go into detail regarding the vacuum circuit of the GM TPI fuel injection system and show what vehicle systems it controls.Be sure to check ou... 5,277 Posts. #2 · Mar 7, 2009. If you ever suspect a fuel pump isn't working, I'd recommend pulling the fuel pump relay and jumpering the wires from B (+) to the pump supply. The pump should run as long as the jumper is installed. The ECM controls the fuel pump relay.May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money 5,277 Posts. #2 · Mar 7, 2009. If you ever suspect a fuel pump isn't working, I'd recommend pulling the fuel pump relay and jumpering the wires from B (+) to the pump supply. The pump should run as long as the jumper is installed. The ECM controls the fuel pump relay.Nov 02, 2008 · The 2 vacuum ports that come out of the rear of the upper plenum on the passengers side get brittle and break, check there for a vacuum leak. Also check for a vacuum leak around the throttlebody butterfly shafts, spray a little carb cleaner where the shafts go into the TB and listen for a change in RPM. Jul 12, 2008 · The first step is to remove the plenum from the runners. This includes the throttle body as well. At this point, it can be removed as one unit. You can also drain the coolant from the engine and... In this video I go into detail regarding the vacuum circuit of the GM TPI fuel injection system and show what vehicle systems it controls.Be sure to check ou... May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... Apr 27, 2009 · I have a 1989 Chevrolet corvette that runs and idles nice on a cold engine but once the car heats up it runs and idles rough. The car has the 5.7l 350 small block with the Tuned Port Fuel Injection. W … read more Tuned Port Injection was introduced back in 1985, and was used on Camaros and Firebirds by GM up until 1992. The Corvettes used it up until 1991, as they moved on to the LT1 in 92. ... ECM number 16198259 is equivalent and can be used in its place without any problems. The same computer was used both for 305 and for 350 engines. The only ... examples of biblical theology Nov 02, 2008 · The 2 vacuum ports that come out of the rear of the upper plenum on the passengers side get brittle and break, check there for a vacuum leak. Also check for a vacuum leak around the throttlebody butterfly shafts, spray a little carb cleaner where the shafts go into the TB and listen for a change in RPM. TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve.Oct 22, 2015 · when the minimal throttle position sensor voltage is not at 0.53 closed.. your computer may think you are in clear flood mode.. reducing the injector pulse width to almost nothing while cranking. when the minimum voltage varies.. you will not drop into the idle fuel control settings with the injectors at 1.2 to 1.4ms. they will be up around 2.1 … Using direct injection also allows your car's engine computer to allow greater control of where and how much fuel is injected into the engine cylinder. This typically means that an engine equipped with direct injection will get better gas mileage than an engine equipped with port injection. Direct injection is the newer technology and why it ...Aug 28, 2017 · A: The Tuned Port Injection engines in these cars have a reputation for developing both vacuum leaks and dirty throttle bodies. Either of these can cause the idle and off-idle stumble problems you’re having. We recommend looking at both to find a solution to your problem. Also, be sure to check your fuel pressure. It should be 36 psi at idle. Nov 02, 2008 · BlackCamaro. I have a 1986 Chevy camaro with the 305 TPI with a HEI distributor (coil/cap). Vehicle trys to start, runs rich, will run with throttle wide open, did tune up, when running it will run very rough like cylinders not firing but all get fuel and spark. Compression is good. set timming triple checked firing order. Oct 21, 2008 · TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve. Jul 01, 2002 · The TPI manifold was originally designed for 305ci engines with 19 lb/hr fuel injectors operating at 36 psi, and employs a long and narrow runner to enhance bottom and midrange torque. The 350ci ... Using direct injection also allows your car's engine computer to allow greater control of where and how much fuel is injected into the engine cylinder. This typically means that an engine equipped with direct injection will get better gas mileage than an engine equipped with port injection. Direct injection is the newer technology and why it ...May 09, 2020 · Engine malfunction light appears or service engine light. Reduced power and performance. 5. EcoTec3 and Active Fuel Management Problems. One of the biggest issue with the 5.3L vortec, and really all vortec engines for that matter, was excessive oil consumption caused by the active fuel management system. The L98 TPI is known for being a bit of a pooch over 4,200rpm. Our effort today for tuned port injection performance upgrades was put into porting a stock TPI plenum to prepare it for the upgraded Arizona Speed & Marine Runners as well as the larger throttle body opening. Our goals for this 1991 Camaro Z28’s 3rd gen TPI setup is 400hp at the ... verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your …''Corvette Experience''Corvette C4 Automatic Tuned Port Injection.Engine: 5.7 L V8 Year: 1987 May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money The first production TUNED PORT INJECTION (TPI) appeared on General Motors vehicles in 1985. ... Sequential Central Port Injection is a standard on the 4.3L/4300, 5.0L/5000 L30, 5.7L/5700L31, and 7.4L/7400 L29 engines. ... what we make we offer tech support and are familiar with the problems you encounter and can diagnose and take care of ...Chevrolets Tuned Port Fuel Injection System, or TPI as it is more commonly referred to, first appeared on production vehicles in 1985 and, since then, has been used on all Corvettes and on many specially equipped Camaros and Firebirds. GM advertising claims of up to a 20% improvement in torque, horsepower and mileage, over equivalent carbureted ...Part one of the TPI tear down and rebuild on the VetteSource 1988 Yellow Gold Firebird Formula 350. In this video I detail the removal of the air intake, thr...DescriptionIn this video I go into detail regarding the vacuum circuit of the GM TPI fuel injection system and show what vehicle systems it controls.Be sure to check ou... left side of body energy Aug 24, 2004 · Basics for fixing common problems with Tuned Port Induction. Cam Benty Writer. Aug 24, 2004. When the Tuned Port fuel-injection system arrived in 1985, it was asignificant improvement on the ... Joined Nov 22, 1999 10,164 Posts #9 · Feb 23, 2000 15-coolant temp low 22-throttle position sensor signal voltage low. 23-manifold temp sensor circut low 34- map sensor signal voltage low. Check your grounds, the engine and computer. check bat voltage. All these circuts can't be bad. JimM Premium Member Joined Dec 7, 1999 22,122 PostsMay 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money Aug 24, 2004 · The Tuned Port MAF sensor is a sensitive piece of equipment thatincorporates a thin piece of wire that reads air intake and reports tothe computer the current air conditions. If the wire is damaged... Oct 21, 2008 · TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve. Aug 28, 2017 · A: The Tuned Port Injection engines in these cars have a reputation for developing both vacuum leaks and dirty throttle bodies. Either of these can cause the idle and off-idle stumble problems you’re having. We recommend looking at both to find a solution to your problem. Also, be sure to check your fuel pressure. It should be 36 psi at idle. DescriptionPorting the intake, adding a larger throttle body and runners, and higher flow injectors will help a high performance engine. But, just as a high- flowing carburetor can be too big for a mild to...Options include working R134 A/C with new compressor, power steering, power disc brakes, windows, mirrors, driver's seat and door locks. Rally gauges includi... Jul 01, 2002 · The TPI manifold was originally designed for 305ci engines with 19 lb/hr fuel injectors operating at 36 psi, and employs a long and narrow runner to enhance bottom and midrange torque. The 350ci ... what weve checked: verified that the motor was timed on the compression stroke. verified firing order. verified wiring to the hei was correct. motor starts to run a little better at about 30 degrees advanced, but we cant crank more into it due to the coil hitting the intake. weve checked and double checked everything, goig so far as to hook up …May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money Nov 02, 2008 · The 2 vacuum ports that come out of the rear of the upper plenum on the passengers side get brittle and break, check there for a vacuum leak. Also check for a vacuum leak around the throttlebody butterfly shafts, spray a little carb cleaner where the shafts go into the TB and listen for a change in RPM. May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... Nov 02, 2008 · The 2 vacuum ports that come out of the rear of the upper plenum on the passengers side get brittle and break, check there for a vacuum leak. Also check for a vacuum leak around the throttlebody butterfly shafts, spray a little carb cleaner where the shafts go into the TB and listen for a change in RPM. A: The Tuned Port Injection engines in these cars have a reputation for developing both vacuum leaks and dirty throttle bodies. Either of these can cause the idle and off-idle stumble problems you're having. We recommend looking at both to find a solution to your problem. Also, be sure to check your fuel pressure. It should be 36 psi at idle.I have a 87 Iroc 305 Tuned Port Injection that is having some nasty issues. The engine starts without issues, however it will attempt to die at idle if you do not keep you're foot on the gas. It also smells like it is running really rich. At highway speeds, it seems fine, but driving around the city is horrible.Jul 01, 2002 · The TPI manifold was originally designed for 305ci engines with 19 lb/hr fuel injectors operating at 36 psi, and employs a long and narrow runner to enhance bottom and midrange torque. The 350ci ... Jan 03, 2022 · Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet. May 09, 2020 · Engine malfunction light appears or service engine light. Reduced power and performance. 5. EcoTec3 and Active Fuel Management Problems. One of the biggest issue with the 5.3L vortec, and really all vortec engines for that matter, was excessive oil consumption caused by the active fuel management system. Jan 10, 2018 · The throttle bodies could flow the air. Compression was up and a more aggressive cam was installed from the factory. Even choked with catalytic converters, the exhaust flowed respectably thanks to header-like manifolds. The problem was that GM shrank the size of the intake runners down to just 2/3rds of the size of the intake ports. Jul 12, 2008 · The first step is to remove the plenum from the runners. This includes the throttle body as well. At this point, it can be removed as one unit. You can also drain the coolant from the engine and... If it just one day started running like garbage, that sounds more like a faulty component, unless of course a vac line got disconnected. Either way all are good suggestions; be sure to give your car a thorough diagnosis and as was stated by others, don't just throw your money away at what you think is wrong. C4TPI Registered Joined May 9, 2011Jan 10, 2018 · The throttle bodies could flow the air. Compression was up and a more aggressive cam was installed from the factory. Even choked with catalytic converters, the exhaust flowed respectably thanks to header-like manifolds. The problem was that GM shrank the size of the intake runners down to just 2/3rds of the size of the intake ports. Joined Mar 2, 2013 Messages 9,855 Location The Midwest Apr 25, 2017 #2 My dad had an Iroc-Z with TPI. Tuned Port Injection was ideally tuned and sized for the 305, not the 350. The small intake runners is why the 350 only had 10 more HP. I would rather have a good carb setup on a 383 or a better fuel injection system. OVERKILL $100 Site Donor 20211988 camaro iroc z 350 tune port injected. need to reset timing on the computer. jodie To set the ignition timing you will need to disconnect the electronic timing control. It is usually a dark brown and black wire located on the passenger side foot well where the carpet meets the firewall.Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. Jun 30, 2011 · 1989 corvette tuned port injection. Problem : car cold starts and runs great but once warmed up will not restart until about a 30 to 45 min cool down. Two local Chevy dealers say they cannot read computer and believes prob is an electrical heat resistance prob and may need a new distributor as fuel flow has proven not to be the prob. Under Pressure. Back in 1992, General Motors introduced a new type of fuel injection system known as "Central Port Injection" (CPI), which GM also refers to as "Central Multi-point Fuel Injection" (CMFI). The system was used on 4.3L V6 Vortec engines through 1995, and was redesigned in 1996 and renamed "Central Sequential Fuel ...Oct 21, 2008 · TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve. Jul 12, 2008 · The first step is to remove the plenum from the runners. This includes the throttle body as well. At this point, it can be removed as one unit. You can also drain the coolant from the engine and... May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money Jul 12, 2008 · The first step is to remove the plenum from the runners. This includes the throttle body as well. At this point, it can be removed as one unit. You can also drain the coolant from the engine and... verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your …Welcome to Harris Performance, this site dealing with the TPI Tune Port Injection system used by GM from 1985 through 1992. I have posted pages to help those with these systems overcome the limitations of those systems and point out what those limitations are. While I specialize more in the daily driver type fuel injection aspects rather than ...May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... Jul 12, 2008 · The first step is to remove the plenum from the runners. This includes the throttle body as well. At this point, it can be removed as one unit. You can also drain the coolant from the engine and... Aug 27, 2008 · Chevy Mechanic: HelloCustomer Check the fuel injectors for injector pulse. We have a tool called a noid light. It is basically a LED with 2 prongs that plug into the injector connector. When you crank the car is should flash very brightly to indicate the computer is pulsing the injectors. ''Corvette Experience''Corvette C4 Automatic Tuned Port Injection.Engine: 5.7 L V8 Year: 1987 Symptoms of excessive carbon build-up on the FA20 turbo direct injection engine include: Misfires Rough idle Stuttering / hesitation Power loss Misfires are typically the start of the problems with carbon deposits on the intake valves. You’ll also likely notice rough idling and stuttering or hesitation while accelerating. Jun 30, 2011 · 1989 corvette tuned port injection. Problem : car cold starts and runs great but once warmed up will not restart until about a 30 to 45 min cool down. Two local Chevy dealers say they cannot read computer and believes prob is an electrical heat resistance prob and may need a new distributor as fuel flow has proven not to be the prob. Feb 19, 2009 · verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your … 5,277 Posts. #2 · Mar 7, 2009. If you ever suspect a fuel pump isn't working, I'd recommend pulling the fuel pump relay and jumpering the wires from B (+) to the pump supply. The pump should run as long as the jumper is installed. The ECM controls the fuel pump relay.Part one of the TPI tear down and rebuild on the VetteSource 1988 Yellow Gold Firebird Formula 350. In this video I detail the removal of the air intake, thr...what weve checked: verified that the motor was timed on the compression stroke. verified firing order. verified wiring to the hei was correct. motor starts to run a little better at about 30 degrees advanced, but we cant crank more into it due to the coil hitting the intake. weve checked and double checked everything, goig so far as to hook up …I have a 1986 Corvette with a 5.7L v8 L98 tuned port injection engine. Usually when i start the car, it idles around 7 to 8rpm on the dash, but lately, after driving the car, when i slow down, the car just dies. It can run fine one minute, then when stopped at a red light, the rpm will drow down to 6, then 5, down to 3, back to 5, and die.Apr 27, 2009 · I have a 1989 Chevrolet corvette that runs and idles nice on a cold engine but once the car heats up it runs and idles rough. The car has the 5.7l 350 small block with the Tuned Port Fuel Injection. W … read more Aug 24, 2004 · Basics for fixing common problems with Tuned Port Induction. Cam Benty Writer. Aug 24, 2004. When the Tuned Port fuel-injection system arrived in 1985, it was asignificant improvement on the ... Feb 19, 2009 · verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your … Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. Aug 24, 2004 · Basics for fixing common problems with Tuned Port Induction. Cam Benty Writer. Aug 24, 2004. When the Tuned Port fuel-injection system arrived in 1985, it was asignificant improvement on the ... Oct 21, 2008 · TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve. Dec 09, 2014 · have an s10 built and swapped a 383 stroker and dropped it in. converted to tuned port injection off of a 86 camaro non VATS. New fuel pump, and relays, new #24 injectors, new MAF, New knock, new elec … In this video I go into detail regarding the vacuum circuit of the GM TPI fuel injection system and show what vehicle systems it controls.Be sure to check ou... Tuned Port Injection was introduced back in 1985, and was used on Camaros and Firebirds by GM up until 1992. The Corvettes used it up until 1991, as they moved on to the LT1 in 92. ... ECM number 16198259 is equivalent and can be used in its place without any problems. The same computer was used both for 305 and for 350 engines. The only ...May 18, 2009 · i'm having a problem with my 1990 iroc-z camaro. the engine is a 5.0 tuned port injection motor, and when the motor gets warmed up it runs very bad. when the car ran like this last time the dealer said that i had some bad fuel injectors and charged me alot of money Mar 07, 2009 · The injectors could be stuck open, but all the right side are electrically connected together, same with the left. Both sides are ground controlled. There would be ALOT of fuel running into the engine, engine would hydrolock. The fuel pump relay is ecm controlled (ground), also the oil pressure switch is a redundant power supply to the pump. Welcome to Harris Performance, this site dealing with the TPI Tune Port Injection system used by GM from 1985 through 1992. I have posted pages to help those with these systems overcome the limitations of those systems and point out what those limitations are. While I specialize more in the daily driver type fuel injection aspects rather than ...A: The Tuned Port Injection engines in these cars have a reputation for developing both vacuum leaks and dirty throttle bodies. Either of these can cause the idle and off-idle stumble problems you're having. We recommend looking at both to find a solution to your problem. Also, be sure to check your fuel pressure. It should be 36 psi at idle.May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... TPI requires the timing set to 6 degrees initial timing with the esc bypass wire disconnected. The pull the battery cable to clear the code set when finished. You might want to look at your TPS. It should be set to .54 Your hunting idle is caused by a mis-adjusted throttle blade, or bad IAC. There's a reason GM put a plug on the throttle valve.verify your fuel pressure stays up in the 37-40 psi range without falling much after the cars shut off for at least 5 full minutes, and it should stay at 37-42 psi if the fuel rail pressure does drop off in the first few minutes its almost always a leaky injector or bad fuel pressure regulator, and check for vacuum leaks either could cause your …In this video I go into detail regarding the vacuum circuit of the GM TPI fuel injection system and show what vehicle systems it controls.Be sure to check ou... May 10, 2010 · 350 tuned port injection problems again. Reply Subscribe . Thread Tools 05-10-2010, 04:29 PM #11 burnskustomz. Senior Member. DYNO OPERATOR. Thread Starter . Join ... Jan 03, 2022 · Port Injection is a kit that installs between the intake manifold and cylinder head and runs on a low pressure supply to deliver more fuel to the engine than the stock system can do. It's a relatively easy system to install, usually no permanent changes required on your car. The injection nozzles are located at the port injection at the air inlet. ''Corvette Experience''Corvette C4 Automatic Tuned Port Injection.Engine: 5.7 L V8 Year: 1987 Using direct injection also allows your car's engine computer to allow greater control of where and how much fuel is injected into the engine cylinder. This typically means that an engine equipped with direct injection will get better gas mileage than an engine equipped with port injection. Direct injection is the newer technology and why it ...1988 camaro iroc z 350 tune port injected. need to reset timing on the computer. jodie To set the ignition timing you will need to disconnect the electronic timing control. It is usually a dark brown and black wire located on the passenger side foot well where the carpet meets the firewall.Tuned port injection / Induction received its name because of the runners, as the air enters the throttle body, through the upper plenum, it is driven down a series of 8 runners that are all equally tuned, by length and size. Down to the lower intake port, thus the name was born Tuned Port Injection / Induction. Joined Mar 2, 2013 Messages 9,855 Location The Midwest Apr 25, 2017 #2 My dad had an Iroc-Z with TPI. Tuned Port Injection was ideally tuned and sized for the 305, not the 350. The small intake runners is why the 350 only had 10 more HP. I would rather have a good carb setup on a 383 or a better fuel injection system. OVERKILL $100 Site Donor 2021Jul 12, 2008 · The first step is to remove the plenum from the runners. This includes the throttle body as well. At this point, it can be removed as one unit. You can also drain the coolant from the engine and... Jan 10, 2018 · The throttle bodies could flow the air. Compression was up and a more aggressive cam was installed from the factory. Even choked with catalytic converters, the exhaust flowed respectably thanks to header-like manifolds. The problem was that GM shrank the size of the intake runners down to just 2/3rds of the size of the intake ports. central arizona florence correctional complex mugshotsxa