Question about 1989 Pontiac Grand Prix

2 Answers

89 Grand Prix will quit after running

My car will start and run great till it gets warm then it quits. Wait till it cools off and it will start again. I have replaced the coil pack, computer.
Could it be the fuel pump, maf, I'm not sure I yust looking for some where to start.

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  • rednergs1dm Sep 01, 2008

    what is the best way to check the fuel pump?




  • rednergs1dm Sep 01, 2008

    the check eng light has not come on as of yet will there still be codes?

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2 Answers

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Starting point is some checks and tests.First,scan the car for diagnostic trouble codes.If a manfunction is occuring,it is highly likely that the vehicle computer has recorded and stored a trouble code or two.The trouble code will point to the system or subsytem or sensor that is malfunctioning.Every trouble code has a diagnostic route to resolve the problem.If you suspect a fuel problem,a pressure gauge should be hooked to the fuel injection rail to verify proper fuel pressure.Also look for vacuum lines that are cracked,deteriorated,or sucking air.Good luck.

Posted on Sep 01, 2008

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  • Master
  • 3,614 Answers

Could be your fuel pump must b check

Posted on Sep 01, 2008

  • micromaster
    micromaster Sep 01, 2008

    Do
    a quick ignition check, check your distributor for cracks or corrosion,
    check your plug wires with an ohmmeter to makesure that they aren't
    breaking down from the heat (check when cold and warm to be accurate),
    and check your plugs to make sure that they aren't fouled or damages
    (clean and regap if they are to bad get some more). Finally check your
    timing and the distributor advance line (vacuum if it isnt electronic).
    Hopefully this will solve your problem, it sounds like your timing
    isn't advancing correctly.

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