Question about 1999 Pontiac Grand Prix

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1999 Grand Prix STP Super charged will not run for then 30 secs.

I was out of town for the day got back in town and turn the corner and the car died, tried to start the car would not run more then 10 to 15 secs, cleaned the MAF sensor with the right cleaner will run for about 30 to 45 secs now, I can rev it up and as soon as I take my foot of the gas It dies, what could my problem be. Help

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  • 6 more comments 
  • mark large Apr 20, 2009

    switch out relay # 15 with new one no change. could it be PVC valve?

  • mark large Apr 20, 2009

    Replaced PVC no change.

    Used scan tool no problems or codes problems?

    Can this be a fuel problem fuel pump/ filter/ or anything else.

    I need help my job is on the line.,

  • mark large Apr 21, 2009

    Hey Pentium 22,

    Yes I can hear the fuel pump when I turn on the ING.

    No I did not bend the pin on the relay, I'm sitting with the relay in front of me right now & have the picture in front of me to, looking more closely at the relay tab 85 is at the top left side of the relay,

    looking at the picture it shows it at the bottom left side whitch is tab 87a, whitch one is right, the part numbers are the same as picture.

    If I do bend the tab 85 and it runs like a champ, what is my problem and what needs to be replaced the relay?

    and how long can you drive with it like this? Thanks for your help so far.

  • mark large Apr 22, 2009

    Hey Pentium 22,

    I was reading the side of the relay turned it over and seen where tab 85 was and it was on the bottom left like the picture show.

    It's running like a champ now, so what needs to be done now & what parts need to be replaced to keep it running? I know I have to replace the relay what else?

    I let it run for about 20 mins and notice that black stuff was comming out of the exhaust bettween muffler and pipe?

    Look forward to hearing for you. Thanks

  • mark large Apr 24, 2009

    Hey Pentium,

    Do I need to remove the battery to get to this?

    Also the picture that was attached was not very clear & about what to do is there some where else I can find a better Picture. & INFO.

    And I notices you are a apprentice keep up the great work you are doing, you are a angel. & thanks for all your HELP

  • mark large Apr 28, 2009

    hey Pentium22,

    everthing is working great, took a bit to get the kit in Canada not aviable here any where? go figer. Yea your pretty good Wish luck in what ever your doing.



  • mark large May 07, 2009

    Hey Pentium,

    I have another problem, my trans seems to be shifting hard at times I had the fluid change at xmas this year, when it does this I will pull over and shut off the car for about 2 mins then restart it's find do I need to change the trans filter?

    Yea we are neighbors, From Manitoba go figure?


  • mark large May 09, 2009

    driving in over drive 1st 2nd & 3rd hard shifts? the same in drive.



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I can almost guarantee it’s not anything to do with his "turbo" or a vacuum leak.

Since I believe this person has GTP, which is supercharged, he is having an issue with his fuel pump resistor. See, GM put a resistor on the fuel pump to make it run at a slowly or faster when the car is pushing boost. I guess their idea was something about fuel econ.

But, when this fails to work the car will die after about 5-10 seconds of running. So there is an easy way to diagnose this problem.

Locate your fuse block under your hood; it’s on the pass side by the battery.
Open the box and find relay #15. Pull out the relay in the attached picture and bend the pin out, reseat the relay and start your car. If your car runs like a champ, you know what the problem was.

And yes, you can run it like this, but I wouldn’t.

img. ---à

Posted on Apr 20, 2009

  • 5 more comments 
  • pentium22 Apr 21, 2009

    Can you hear the fuel pump prime when you put the key to the ON position?

    In another words hear it turn on for a few seconds?

  • pentium22 Apr 21, 2009

    Also, did you bend the pin on the relay or just replace it, because replacing it wont fix the problem, it just by-passes the problem.

  • pentium22 Apr 22, 2009

    Alright, well your fuel pump seems to be working fine if you can hear it prime for a few seconds.

    And yes, bend the pin on that relay, its the one that is closes to the passenger side fender. Last time I checked it, they only go in one way, so 

    Also, you can get away driving it for the time being with the fuel pump running in high mode, but like I said, don't do it for months on end, just enough till you can replace the part you are bypassing.

    Picture, if it helps:

  • pentium22 Apr 23, 2009


    Yeah, the relay that you bent the tab on is just peachy, there is nothing wrong with it so just bend it back, or use the new one. The part that needs to be replaced is under the passenger side fender, where the battery sits.

    The part number is...GM Part #8951182, called a Fuel Pump Resistor and should run you about 50 bucks. 

    Also with the black **** coming out of your exhaust is because your car is going to be running rich for the time being since the pump is running in "high mode", thats why I said you are to be able to drive it until you get it fixed, but not for a long period of time, just pick up that part and replace it. 

    Check out this image to kinda give you an idea where and what your looking for. Glad I could help :) Not the mention help you keep your job.

  • pentium22 Apr 24, 2009

    Not bad for someone that doesn't work on cars... 

    Try this, and thanks again.

  • pentium22 Apr 28, 2009

    Thanks a lot, if you were just down the street I would have fixed it for you. I guess Minnesota is close enough to Canada to be called neighbors.

    Hope everything continues to work well for you, especially your car.

    Take care.

  • pentium22 May 08, 2009

    1st - overdrive? Or just a couple of gears?


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Check for vacuum leak .make sure your waste gate actuator working properly. make sure your turbo is over boosting.

Posted on Apr 19, 2009

  • Jonah Oneal Apr 21, 2009

    check fuel pressures+scan it make sure all fuel injectors are working.

  • Jonah Oneal May 08, 2009

    replace mass air flow sensor you not suppose to clean them when they go bad .you replace them.check mass air flow relays first .mass air flow sensors are very expensive.if they go bad they causes engine to run rich .i would get it scan by tech 2 scanner to check be sure .they cost about $400.00.



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