TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

Someone please help!!!

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Old 12-10-2008, 11:45 AM
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Car: 1988 Pontiac Firebird
Engine: 5.0 TBI
Transmission: W/C T5
Axle/Gears: 3.08 Posi
Someone please help!!!

OK so i had this posted in the tech / general engine section with no success. I am hoping that posting it here someone might know what problem i have. Here is a link to the posts https://www.thirdgen.org/forums/tech...ssing-wot.html

Also here is a video of the problem i am having http://s495.photobucket.com/albums/r...Carproblem.flv

This is my D/D so i am really in need of having her up and running again. Any response, reply, suggestion, ANY help is greatly appreciated -Russ
Old 12-10-2008, 05:27 PM
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Car: 1988 Pontiac Firebird
Engine: 5.0 TBI
Transmission: W/C T5
Axle/Gears: 3.08 Posi
Re: Someone please help!!!

Ok so should i assume that NO ONE knows what my problem could be ? This is driving me !!!!!!
Old 12-10-2008, 06:57 PM
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Car: 1991 RS
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Re: Someone please help!!!

You mentioned that you replaced the wires. Is the firing order correct?
----------
Is the distributor in correct? (why is the hood off?)

Last edited by Jono4820; 12-10-2008 at 07:01 PM. Reason: Automerged Doublepost
Old 12-10-2008, 07:39 PM
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Car: 1988 Pontiac Firebird
Engine: 5.0 TBI
Transmission: W/C T5
Axle/Gears: 3.08 Posi
Re: Someone please help!!!

I have checked the firing order quite a few times. I achieved TDC by pulling the #1 plug and cranking it over with my finger over cylinder untill it blew off my finger .The car was working fine then all of a sudden she started to miss at WOT, then the problem kept getting worse. As to tell you why my car don't have a hood on..... I just bought the car within the last 4 months. The previous owner hit a Bear on the highway, and destroyed the headlight assembly, upper core support, hood, passenger fender, and last but not least the windshield.

So here I am trying to save this bird from being crushed. I have around $4500 Including the price of the car put into it. I fell in love with F-bodys, when i bought my 99 TransAm in 2000. Then i had my daughter in 2002 , and as soon as she was born i had to sell my Bird .

Last edited by akmusclecar; 12-10-2008 at 07:42 PM.
Old 12-10-2008, 07:47 PM
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Car: 91 rs,1 92 rs,92 b4c/1le
Engine: 5.0tbi,5.7 tune port/5.0tpi
Transmission: 5spdx2 and t56
Axle/Gears: 3.08,3.73,3.42
Re: Someone please help!!!

i had the same problem when my egr was opening replaced the solenoid and the problem was fixed. other than that i swa a plugged muffler cause a similar problem
good luck
Old 12-10-2008, 09:07 PM
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Car: 1988 Pontiac Firebird
Engine: 5.0 TBI
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Axle/Gears: 3.08 Posi
Re: Someone please help!!!

I have replaced the EGR valve. That was one of the first things i had to do to get the car to pass emissions. I think the car maybe running rich. I have a rich smelling exhaust that i just noticed.and some blackened snow after i rev'd the engine up.Also my fuel pump has had a whine since i bought the car, but i have never had a lack of fuel issue. Oh yeah for all the replies. Even if i don't have the bird running well right now, i still appreciate the suggestions. - Russ

Edit: also under slight throttle i can rev the engine up to 5000rpms no problem. It's only giving me grief under wide open throttle.

Last edited by akmusclecar; 12-10-2008 at 10:11 PM.
Old 12-13-2008, 06:18 PM
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Re: Someone please help!!!

Have you hooked up a fuel pressure gauge yet?
Old 12-13-2008, 06:32 PM
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Re: Someone please help!!!

I have not yet. I don't have acess to one right now. I do have a air/fuel gauge to install to see atleats if i am running rich or lean. I have an idea that i may be running lean at WOT. If my pump is going out it would be loosing pressure and causing a lean condition at higher rpms. I also have a Holley 12-903 255lph pump to install over the weekend.
Old 12-13-2008, 11:24 PM
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Re: Someone please help!!!

try setting your base timing up 4-8* any modified tbi seems to like that it will even help a stock one. also before u spend another dime check your fp anything less than 11 psi and they run horrible.




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