Question about 1991 Pontiac Firebird

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1991 5.7 TPI trans am wont start back up after warming up

I have had this car about two years. It is a 1991 factory 5.0 TPI automatic car. I purchased it in perfect running condition.The 5.7 block was installed before I purchased the car and ran just fine. (to date the engine-the valve covers have the homd down screws in the middle of the covers.) Last year it started this problem- I would be driving and it seemes to stall out when it warmed up- then, after new distrib,cap,rotor,plugs,timing chain,fuel pressure regulator, new plenum gaskets, remanufactued computer and PROM-and much more- I still cannot find this problem. I also removed the exhaust from the Cat back (needed to be replaced and the Cat would glow RED when I allowed it to sit and run before I shut it off-so I thought maybe the cat was clogged but I removed it and still the problem persists.)
I have NOT done anything within the fuel tank but it has about 45-50psi at the fuel rail up on the injection. I checked the injectors with a test light and they all SEEM to be working-
You can start the car-it will run choppy and will sit and idle all day long-(correct temp. and all)
If you sut the car off when it is warm- It WILL NOT RESTART at all.-seems to be electrical??


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  • s60six May 11, 2010

    check the ignition timing and the firing order


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This is my own take on your problem, i don't think thats enought pressure from fuel pump, thats pressure you get from throttle body injection. I believe fuel injection should be around 60 psi. Just a few pounds below that it won't run right.

Posted on Feb 09, 2009

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suggest the first thing you do, is to pull the codes off the ECM, and go from there...more than likely it's a TPI, idle sensor or fuel pump relay thats dirty or sticking thats causeing the problem...
Your local AutoZone can perform the scan and explain the results to of charge.
Good luck, hope this helps,please rate me a fixya.

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