Question about 2002 Pontiac Grand Prix

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2002 grand prix starts but wont idle it will stay running if u keep rpms high---changed fuel filter and pump fluids are good

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  • James Karels May 22, 2014

    The Common Problem first is the inside of the throttle body is gummed up.since you cant see through the screen to check it take off the IAC valve and stick your pinky finger in the hole and pull it out-as in most cases if your finger is black, it needs to be cleaned out. Second- If the "check Engine" light stays on while engine is running, Use a scanner/code reader and run the codes- if it shows code 102 or Mass Air Flow Sensor- "Low Voltage" most likely the connector that plugs into sensor is loose or bad- carefully pinch the prongs abit in the connector to give it a tight connection- (remember to also clear the code) if after your still getting same code then replace the connecter plug.the other job is to take off the throttle body housing from the plentum, along with all sensors attached to it and clean out the insides of it (use Q-tips in the tight area's) with carb cleaner spray or gas. also spray the idle control valve and wipe clean with cloth. then reinstall.and the problem will be fixed.

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I just had this problem it was the mass air flow sensor

Posted on Jun 18, 2012

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  • Pontiac Master
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Have the fuel pump pressure tested,also,check out the idle air control.

Posted on Jul 07, 2010

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