Question about 1991 Pontiac Firebird
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??
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
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Mar 02, 2013 | 1998 Chevrolet Cavalier
Aug 28, 2011 | 1991 Pontiac Firebird
Feb 25, 2011 | 1992 Cadillac DeVille
Oct 21, 2010 | 1991 Ford F350
Jan 01, 2010 | 1991 Ford F150
Oct 14, 2009 | 1991 Pontiac Firebird
Jun 23, 2009 | 1991 Chevrolet Camaro
Jul 01, 2008 | 1991 Toyota 4Runner
410 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: