Question about Pontiac Grand Am

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RPMs rev up while driving, mechaninc said the compression was not correct. Replaced fuel pump, filter, and throttle position sensor. It will run fine until it warms up, then the problems occur, will stall when stopped, but will restart. After it is warm it will act up, then run okay for a few miles. Any suggestions?

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  • gdrill1 Jul 29, 2009

    Replaced fuel pump because it was giving a false gas gauge reading once it begin acting up. The motor has less then 50,000 miles on it. Has never ran hot. I believe the mechanic was just grasping for straws when he stated that the compression was in correct. Just trying to verify, his diagnosis.
    After it has been driven for 15-20 miles is when the problem will begin to occur, then it will run fine for a bit, if you get into city traffic, it will then stall, but start right up again, when you place it in drive it will usually stall 5-6 times before you will be able to drive on again.

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Why would you replace the fuel pump and filter for a compression problem. You either have a bad cylinder head, or a bad motor. Those are the only 2 things that will give you low compression. If you are talking about the engine revving up while driving down the road, you have a transmission problem.

Posted on Jul 29, 2009

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