Question about Pontiac Grand Prix

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2002 Grand Prix. Service engine soon light on. steady at times. Flashing at times. Sputtering and running very rough. Machine says all plugs are misfiring.

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  • Pontiac Master
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Check or replace your ignition coils and wires.

Posted on Oct 14, 2013

Testimonial: "Coil pack replaced. Still doing the same thing. What next?"

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SOURCE: 2002 grand prix runs rough,dies service engine

sounds like you have a vacuum leak, check all the vacuum hoses and replace any broken or kinked ones, also check around the intake manifold gasket for leaks. any air leaks after the air flow meter creates 'un-metered' air which inturn will make the car run rough and stall, hope this helps

Posted on Apr 04, 2009

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2002 grand prix runs rough,dies service engine


sounds like you have a vacuum leak, check all the vacuum hoses and replace any broken or kinked ones, also check around the intake manifold gasket for leaks. any air leaks after the air flow meter creates 'un-metered' air which inturn will make the car run rough and stall, hope this helps

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If you unplug the MAF sensor it should run using the default mapping. I'm having the same problem, but I want to figure out why it won't run with the sensor connected.

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