Question about 1991 Pontiac Firebird

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Have 1991 Pontiac Firebird 3.1 engine replaced fuel and fuel injectors and now the gas in filling up the oil pan overnight while not running.

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The o-rings on the injectors have torn....I have seen this happen before,,
The o-rings keep fuel from going into engine...You will have to remove injectors and replace the o-rings...all of them....Get some vaseline or electrical lube and coat the o-rings with it so they will become slick and install them very slow and carefully twist it slightly left to right while pushing in slightly until contact....Then change the oil of course...You have to be very careful.
I hope this helps.....................................................Metalpoet......Level 2 certified tech.

Posted on Mar 28, 2011

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Auto choke is stuck open unplug and try

Posted on Mar 28, 2011


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1 Answer

My 1991 pontiac firebird only starts and runs when you hold the key in the start position. As soon as key is released the car shuts off. I have replaced the ignition module and ignition switch, but the...

Sounds like something is getting power only in the start position.
If it shuts off like you are loosing fuel pressure, I would check the fuel pump relay for power and a ground signal from the computer. The computer grounds the relay for 3 seconds while cranking, then only if it sees oil pressure to know the engine is running. There may be a faulty relay that is affecting the ignition system too.

Sep 28, 2012 | 1991 Pontiac Firebird

1 Answer

I just purchased a 1990 pontiac firebird w/3.1 litre engine. It has been sitting since 2005... I bought it from a neighbor and have worked on car trying to get it running in 2005.... I did get it running...

These cars where prone to problems in the stock antitheft system. This causes injector shutdown. Might be something to look into. Here's a link on that.

Oct 27, 2011 | 1990 Pontiac Firebird

1 Answer

Easiest way to drop the oil pan out of a '91 firebird without hoisting the engine up? Can you drop the cross member that prevents it from being able to drop straight down to remove the oil pan?

Don't think it can be done dude,by the time you disconnect everything(including the tranny)
to get enough clearance for the pan,you may as well pull it the rest of the way,crossmember is not removable.

May 09, 2011 | 1991 Pontiac Firebird

1 Answer

I have 1991 firebird v6 engine it will start everytime but some thimes it will run smooth and some times it ask as if its not getting gas it start to sputter the engine was rebuilt about a year ago, the...

indicates problem injectors
a cheap test is to run a couple of cans quality injector cleaner through the fuel tank and if that doesn't improve it have the injectors cleaned and checked
while that is happening run the fault codes to check for other problems

Nov 18, 2017 | 1991 Pontiac Firebird

1 Answer

Bad fuel milage!.

Perform fuel injector check, check the Air filter, clean MAF sensor with the MAF sensor cleaner.Dirt sometimes accumulate on the sensor and that could cause for poor mileage.Before changing your engine oil
clean fuel injectors and sludge from the engine using 3 oz pure acetone and 2 oz xylene on 10 gallons of the fuel. Drive vehicle and then change your oil. You will notice a lot of sludge coming out of the pan. After draining oil, remove pan and gasket and clean with solvents and dry with the compressed air. DO NOT clean with the rag because that can contaminate your engine and oil.

Feb 21, 2010 | 1991 Ford F150

3 Answers

91 firebird won't stay running

you must not add gas, you must drain all the gas from the tank and fuel pump and clean the carburator also the spark plugs. then put a new gas.

Apr 20, 2009 | 1991 Pontiac Firebird

1 Answer

Wont start

Have you done a vacuum leak test?Around the injector seals is a place to start Do you have a manifold vacuum gauge and if so what is the reading that your getting?another thing to check would be the idle bypass and pcv are clear/unblocked and operating correctly.Does this happen wether engine hot or cold?or both

Oct 14, 2008 | 1991 Pontiac Firebird

1 Answer

1969 pontiac firebird oil pan.

you can take the oil pan off by just undoing the bolts just lift the car up then since it is just pin holes you can probly just spot weld them or maybe use a high streangth solder

Jun 24, 2008 | Pontiac Firebird Cars & Trucks

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