Question about 2004 Pontiac Grand Prix

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Car sputters under acceleration. If the throttle is pushed down more than half way, the engine chuggs and spark knocks. Almost like it is running on 4 cylinders. Just put a different Mass Air Flow Sensor in it today and it made no difference. Ehaust smell funny like raw fuel

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  • jnixon_8 Oct 06, 2010

    The car is a 07 grand prix. when I floor it, it misses and spark knocks. is there an egr valve? could it be a catalytic converter? and where would the fuel filter be?

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Hi, you definitely need a full tune up, plugs, wires, fuel & air filters, fuel system service, etc
Check the fuel filter, fuel pump and fuel pressure regulator to make sure they are all functioning properly. Also, check the catalytic converter to make sure they are not plugged.

Posted on Oct 05, 2010

  • Tunde Autos
    Tunde Autos Oct 06, 2010

    It sound more to be the catalytic converter and the fuel filter is inside the tank they are, you have to bring down the tank to replace it because it is not serviceable......

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