Question about 1996 Pontiac Grand Prix

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96 Grand Prix Bad Idle, runs fine when moving

I have a 1996 Pontiac Grand Prix with 180000 miles. When cranked it sits and idles horribly, quickly rotating between hard and soft idle. When I put it in gear and head down the road it runs fine, until I come to a complete stop. What could be causing this? its a 3.1 engine. A second question on the same vehicle, Are the headlights supposed to be on all the time? Even when I turn the geadlight control switch to off they stay on. As soon as I turn it past the run position on the ignition.

Tanks for any help.

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  • jameshd81 Dec 20, 2008

    I appreciate any help offered. what is your take on what could be causing the main problem. The Lights I really am not to worried about, as I think its just the re-wiring my uncle did when he was under the dash about a year ago.

  • jameshd81 Dec 22, 2008

    dgjtex your asking for ratings is inappropriate anyways, therefor ur lucky I did not rate it as such. Post your take or dont bother with helping. There is no reason to say "I will help you if you give me ratings, had you posted your take on the issue then maybe I would have ranked you as helpful if it was a logical take on it or FixYa if it actually helped.

    John thanks for the input, I have went over all the vacuum lines and replaced the ones which needed to be, no leaks, I have also test the fuel rail and there are no clogs in the fuel system. Thanks for helping. The Vacuum lines did help to ease the bad idle but did not eliminate it.


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Hey bro i am a proud owner of grand prix beauties my self lol . The grand prix's have a outside light sensor that turns the your lights on automaticly when dark or gloomey, or driving under a bridge, eliminateing the need to use the switch. Your sensor could be dirty or broken if the lights are staying on on a suny day.

Posted on Oct 04, 2009

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Hey i have the same problem with mine. except mine is constant. a good tip is if your check engine light is on. i'd take it too your local auto store and use a OBD 2 code scanner. mine is being caused by malfuntion sensors. they really are a pain. but i'd check your sensors. take and check for leaks in your intake plumbing. if you have air leaking in after the MAF (mass air flow) it will cause the car to run lean which causes knock (diesel) effect inside the motor. these cars are complicated. im a mechanic myself and with these cars there is alot of varibales into a motor. i miss the good old carbs. but like i said go through your sensors and check for air leaks after the MAF

Posted on Dec 26, 2008

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Vaccum leak. Look on top of the throttle body, there'll be sometype of line splittier that goes into the throttle body, a piece of correct size hose from your local auto parts dealer will fix it. It only takes an inch or so of hose to fix! good luck!

Posted on Dec 20, 2008

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Can help i honestly believe, i am free help. all i want in return is a fixa rating, I honestly believe I can help you save money

Posted on Dec 20, 2008

  • David Johnson
    David Johnson Dec 22, 2008

    When you vote thanks for trying you immediatly hurt a persons rating who is trying to help you..:(

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