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Old 09-11-2011, 08:09 PM   #1
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Default 2002 Pontiac Grand prix - laurching

My 2002 Pontiac Grand Prix is doing weird things like lurching and down shifting weird - even at a stand still at a traffic light. Any ideas?
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Old 09-11-2011, 08:21 PM   #2
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Check your motor mounts.
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Old 09-11-2011, 08:29 PM   #3
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I know the upper ones need replacing but someone told me the trans selenoid might be the problem too.
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Old 09-11-2011, 08:37 PM   #4
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Have the car scanned. Several trans codes don't trip a light. Try rocking the car back and forth and watch the mounts.
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Old 09-11-2011, 08:46 PM   #5
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Will do ...your the man ! ...Dan. Thank you
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Old 09-12-2011, 02:04 AM   #6
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Thread moved to Pontiac Grand Prix mechanical and maintenance section
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Old 09-12-2011, 07:59 AM   #7
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Lurching and odd behavior can also be caused by MAF and TPS sensors. Try and take a look for codes, and scan those sensors to see if all looks well.

Double check your trans fluid color and proper level.
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