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1999 Pontiac Grand Am Question: car won't stay running



febgirl70, 3.4L V6, Pelham, NH, October 21, 2009, 21:32

what is the fuel pressure suppose to be

2 Answers
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  • Medium-star Best Answer
    October 21, 2009, 22:11

    aprox. 38- 42 psi

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  • Answer #2

    patrick mannion from Greg Solow's Engine Room, October 21, 2009, 22:22

    If the car starts the fuel pump must be putting out some fuel pressure or pretty close to the pressure required, could you have a vacuum leak? Has the engine run rough recently or has the Check Engine Light/Service Engine Soon light come on?

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  • Reply

    Blakcboi90, February 11, 2011, 13:58

    Hi Mr. Patrick, hey I have the same exact problem with my 99 grand marquis and yes my check engine light goes on/off every other week or so. First, the "box" that opens&closed when a/c is on&off would make a bangin noise when i turn the a/c on.After a got that "box" replaced, every time I stopped at a stop light I had to make sure I held the brakes because if not the car would jump like it was trying to drive itself. Turn the a/c off and it stops jumping. Now it does that jump thing every blue moon but getting it to stay crunk after it has sat for 5-6hrs. is my new big problem. I changed the mass air flow sensor but it didn't help. Can you?

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