Question about 2000 Pontiac Firebird

2 Answers

96 firebird is having problems, runs very rough, misfire, burning one spark plug, replaced coil pack, full tune up x2, egr replaced. check engine light flashes when the car is running rough ( shaking, hesitation) feels like it is going to stall out. But sometimes it will run perfect for a day or so then right back to running bad?????? PLEASE HELP..

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  • flmi0313 Apr 24, 2009

    I see what you are saying, see I have had it to auto zone, reads NO codes, so I took it to the mechanic to run diagnostics, not throwing any codes at all, so he says I really think it has to be the egr so after hesitating, I replaced the egr ($130.00) this was last night and still running the same, strange thing is when I unplug the NEW egr and the car is running, it runs the exact same???? But sometimes it does it and sometimes it will run great for a day or so. I replaced a coil pack the other day that was bas and the sparkplug that is run on it was absolutely BURNT.. Keep in mind, I did all the plugs and wires less than 2 months ago... When I bought the car she swore it was kept up on totally, I changed the oil when I got it to start it fresh and it looked as if it had not been changed in quite some time, then a week or so later, I had a small amount of white smoke from the exhaust but by the time I turned it around and went home, ( 1 block) it was gone and never re-appeared. Then it was overheating ( days later ) and found out it was a fan, so I replaced that replaced a coil pack and full tune up, replaced a few vaccuum lines. This is the absolute 1st t ime I have ever been stumped on a car. I have had a few people tell me maybe it is the brain?? Help.. Confused and Frustrated in Cape Coral Florida.

  • Anonymous May 01, 2009

    my 94' firebird 3.4L runs perfect some days and on others it runs really rough. the fuel pump, plugs, plug wires, coils, and air filter are all brand new, plus i just did an oil change. any suggestions?

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Have you ran a diagnotic check to see what codes are coming up?
Throwing parts at the problem will get expensive. It will also ruin other parts (Like your catalytic converter), when your engine is misfiring and not running properly. Your vehicle is an OBDII system, fix the problems in the order they appear (then clear, run and recheck)...meaning, one problem can cause another and so on. Fixing one problem may correct the other ones too.
You may get lucky with the shotgun approach, but usually not.
Run a diagnostic test, at least you'll know where to start looking for the problem.

Posted on Apr 24, 2009

  • Dale Long Apr 24, 2009

    GM had a lot of problems with intake manifold gaskets. If you still have the dexicool antifreeze in the car it will turn to a brown gooey mess when it gets air to it. This also is one of the causes of the manifold leak. Might have caused the white smoke emitting from the exhaust.

    Also, did you clean the egr passages out when you replaced the egr? They get clogged and the replacement part isn't able to work.

    Under the coil packs, there can be vacuum leaks coming from the main vacuum leads off of the intake manifold. That would cause the engine to run rough and stall as you described. Check the spark plugs for proper gap, don't forget to put a light coating of anti-seize compound on the threads of the plugs before you install them.

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  • 3 Answers

Sounds like a bad injector.
I'd have them ohm tested.

Posted on May 19, 2009

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