1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
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Car: 1992 Trans Am Convertible
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
I will do that... I have the gasket and new valve covers arriving on friday...
Do you think I should ask Tuned Performance to hold off on the tune until I figure the rest of the Frankenstein Engine?
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
#54
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Here are the photos of the heads without the valve covers... They look new as well nothing loose
Passenger side
Passenger side
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
One more thing to fix...
Does anyone know if I need somehow close this or is this a passage for the coolant that has been blocked off by the cap on the upper right side of the photo?
Does anyone know if I need somehow close this or is this a passage for the coolant that has been blocked off by the cap on the upper right side of the photo?
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Coolant passage on the bottom of the t-body. Helps to keep the T-body from frosting up in certain driving conditions when cold out.
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Those are factory heads for your car. TPI L98 heads. They must have realized the intake wouldn't bolt up to the Vortec heads and swapped the factory heads back on (hopefully with at least a refresh).
The ports on the throttle body are just for throttle body cooling,. You can cut them off and shave down the casting to where it's just the IAC portion. Those ports are both unnecessary. You don't need a plug on them.
GD
The ports on the throttle body are just for throttle body cooling,. You can cut them off and shave down the casting to where it's just the IAC portion. Those ports are both unnecessary. You don't need a plug on them.
GD
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
#61
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Those are factory heads for your car. TPI L98 heads. They must have realized the intake wouldn't bolt up to the Vortec heads and swapped the factory heads back on (hopefully with at least a refresh).
The ports on the throttle body are just for throttle body cooling,. You can cut them off and shave down the casting to where it's just the IAC portion. Those ports are both unnecessary. You don't need a plug on them.
GD
The ports on the throttle body are just for throttle body cooling,. You can cut them off and shave down the casting to where it's just the IAC portion. Those ports are both unnecessary. You don't need a plug on them.
GD
Everything looks new on the heads hopefully it is... I got the injectors in now I am polishing the plenum and painting the rest to remove the Ugly gold color!!!
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Glad they kept the 083s much better than a swirl port tbi head to bad they didn’t turn out to be vortecs.
@GeneralDisorder Is a 183 or does that say 193 a tbi head ?
I didn’t see the 083 on the passengers head
@GeneralDisorder Is a 183 or does that say 193 a tbi head ?
I didn’t see the 083 on the passengers head
Last edited by Tuned Performance; 04-19-2019 at 06:41 PM.
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Glad they kept the 083s much better than a swirl port tbi head to bad they didn’t turn out to be vortecs.
@GeneralDisorder Is a 183 or does that say 193 a tbi head ?
I didn’t see the 083 on the passengers head
@GeneralDisorder Is a 183 or does that say 193 a tbi head ?
I didn’t see the 083 on the passengers head
I have no idea what a 193 head is or what kind of chamber it has compared to the L98 head.
It's starting to look like this is a real mutt.
GD
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
https://www.thirdgen.org/forums/tpi/...4102193-a.html
thats not good probably a larger cc head compared to a 083.
You would of thought this would of changed the compression results.
thats not good probably a larger cc head compared to a 083.
You would of thought this would of changed the compression results.
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Car: 1992 Trans Am Convertible
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Today I cleaned the fuel lines and the fuel rail ran the pump until the gas was 100% clear, replaced the fuel filter again with another K&N, the fuel filter I removed was not bad the gas that came out was clear only a few small specs in the fuel... Installed the new fuel injectors etc... but when I turned on the ignition I had a fuel leak on both middle cylinders on the driver's side... passenger side was 100% dry... I got the injectors from SouthBayFuelInjectors... I had no leaks with the old ones.. could the new ones be defective?
The car continues to run rough and when I disconnect the cable to the injectors the 2 front cylinders on the passenger side don't affect the rpm...
I noticed that if I turn the injectors towards the back of the car they leak a lot less and I was able to run the engine for a short while and make a short video of it...
https://www.dropbox.com/s/jrabotatat...83902.mp4?dl=0
I am really running of ideas on what to do here...
At least most of the gold paint is out
The car continues to run rough and when I disconnect the cable to the injectors the 2 front cylinders on the passenger side don't affect the rpm...
I noticed that if I turn the injectors towards the back of the car they leak a lot less and I was able to run the engine for a short while and make a short video of it...
https://www.dropbox.com/s/jrabotatat...83902.mp4?dl=0
I am really running of ideas on what to do here...
At least most of the gold paint is out
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Car: 1992 Trans Am Convertible
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Vacuum lines on the rear passenger side of the plenum....
The fuel pressure regulator is connected the the small line on the plenum
Now the big port on the plenum was connected to a 90 degree reducer that goes to a dual line connector under the coil... there is another port there that has a broken line and I found a broken hard plastic line under the plenum disconnected... Can anyone that has a TPI check where does two lines connect to?
The fuel pressure regulator is connected the the small line on the plenum
Now the big port on the plenum was connected to a 90 degree reducer that goes to a dual line connector under the coil... there is another port there that has a broken line and I found a broken hard plastic line under the plenum disconnected... Can anyone that has a TPI check where does two lines connect to?
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Not sure what front cylinders your referencing 1 ,3 or 1 and 2.
1 is the first on the drivers side 2 is on the passengers side.
1,3,5,7 are on the drivers side 2,4,6,8 are passengers side.
Are the plug wires on correctly. 1-8-4-3-6-5-7-2 is your firing order.
1 is the first on the drivers side 2 is on the passengers side.
1,3,5,7 are on the drivers side 2,4,6,8 are passengers side.
Are the plug wires on correctly. 1-8-4-3-6-5-7-2 is your firing order.
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
But the ones that are not firing are #2 & #4
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
I am going to check the firing order tomorrow..
When I replaced the cables I did not check just replaced the cables one by one....
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Lets back this up just a bit. THIS ENGINE HAS TWO DIFFERENT CYLINDER HEADS. One is a swirl port TBI head and the other is a 083 TPI head. Heaven only knows what pistons are in it at this point, what the compression ratios are, or if they are even all the same bore.
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Are both types TBI and TPI heads exactly the same on the visible areas?
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
But surely this can't be good. Here's some information on flow rates:
http://garage.grumpysperformance.com...t-heads.10579/
While the static compression may be the same, cylinder filling due to major port difference is probably way off. This is probably resulting in different fueling requirements for each bank, and the TPI only has a single O2 sensor monitoring the driver's side bank. It is *assumed* by the ECM that 1/8 of the total MAF airflow is going into each cylinder - that is not the case when you have radically different airflow through different heads.
Monitor your exhaust temps on the passenger side vs. the driver side. I bet you see significant differences indicating different fuel/air mixture.
GD
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Casting numbers don't lie. The heads are probably very similar by outward appearance. Maybe differences to the pattern on the front/back - the "casting marks"
But surely this can't be good. Here's some information on flow rates:
http://garage.grumpysperformance.com...t-heads.10579/
While the static compression may be the same, cylinder filling due to major port difference is probably way off. This is probably resulting in different fueling requirements for each bank, and the TPI only has a single O2 sensor monitoring the driver's side bank. It is *assumed* by the ECM that 1/8 of the total MAF airflow is going into each cylinder - that is not the case when you have radically different airflow through different heads.
Monitor your exhaust temps on the passenger side vs. the driver side. I bet you see significant differences indicating different fuel/air mixture.
GD
But surely this can't be good. Here's some information on flow rates:
http://garage.grumpysperformance.com...t-heads.10579/
While the static compression may be the same, cylinder filling due to major port difference is probably way off. This is probably resulting in different fueling requirements for each bank, and the TPI only has a single O2 sensor monitoring the driver's side bank. It is *assumed* by the ECM that 1/8 of the total MAF airflow is going into each cylinder - that is not the case when you have radically different airflow through different heads.
Monitor your exhaust temps on the passenger side vs. the driver side. I bet you see significant differences indicating different fuel/air mixture.
GD
It is just hard to believe someone would do that... what were they thinking...
Why spend the money on a crate engine if you are going to do that..
Hopefully tomorrow I will be able to work on the car... The rep on the auto parts store near me had a similar problem with the vibration and 2 cylinders not firing... He told me to try to replace the ignition module on the distributor.. I will try to do that tomorrow and also figure out what to do to stop the gas leak on the injectors...
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Thanks GD...
It is just hard to believe someone would do that... what were they thinking...
Why spend the money on a crate engine if you are going to do that..
Hopefully tomorrow I will be able to work on the car... The rep on the auto parts store near me had a similar problem with the vibration and 2 cylinders not firing... He told me to try to replace the ignition module on the distributor.. I will try to do that tomorrow and also figure out what to do to stop the gas leak on the injectors...
It is just hard to believe someone would do that... what were they thinking...
Why spend the money on a crate engine if you are going to do that..
Hopefully tomorrow I will be able to work on the car... The rep on the auto parts store near me had a similar problem with the vibration and 2 cylinders not firing... He told me to try to replace the ignition module on the distributor.. I will try to do that tomorrow and also figure out what to do to stop the gas leak on the injectors...
GD
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
GD I followed the sequence to the dot.... Contacted South Bay Injectors and Frank told me that it must be the o-Rings I bought new ones and will try to replace.. Not looking forward to do it but what can I do...
Thanks
Thanks
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Hello Everyone...
I was only able to work on the car today...
The engine is running perfect now idles at 700RPM with the TPS set to .054 when the engine is off and it jumps to .061 at idle with the engine turned on...
The two cylinders (#2 & #4) that were not firing are now working perfectly after I changed the distributor module (the old one was kind of melted and had no thermal paste on it)...
Most of the vibration went away but I still have some from 1000RPM to 2300RPM but it is a fraction of what it was before...
Tomorrow I will work on the Flex plate to torque converter bolts that GeneralDisorder on Post #3...
Can I try to run the engine without the bolts to isolate the transmission and converter?
Thanks for all the help!!!
I was only able to work on the car today...
The engine is running perfect now idles at 700RPM with the TPS set to .054 when the engine is off and it jumps to .061 at idle with the engine turned on...
The two cylinders (#2 & #4) that were not firing are now working perfectly after I changed the distributor module (the old one was kind of melted and had no thermal paste on it)...
Most of the vibration went away but I still have some from 1000RPM to 2300RPM but it is a fraction of what it was before...
Tomorrow I will work on the Flex plate to torque converter bolts that GeneralDisorder on Post #3...
Can I try to run the engine without the bolts to isolate the transmission and converter?
Thanks for all the help!!!
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Re: 1989 Trans AM GTA - TPI - Vibration up to 2500 RPM (On Park or Neutral)
Ahh I fixed with the fuel leak with new o-rings from Advanced Auto Parts... I replaced all on the driver's side the ones that came from SouthBayInjectors look a little thiner... well it worked...
Thanks again
Thanks again
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