2002 Pontiac Grand Prix Logo

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Guillermo Miranda Posted on Dec 21, 2016
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I have a pontiac grand prix 2002 when I accelerate above 40mph there is a vibration. When I remove foot from gas the vibration stops.

I took my car to the mechanic and he stated that it was the motor mount that it was broken charge me and its still doing the same thing now he saying that it is the axel. so I just want an opinion out there just to see what else it could be

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Bill Boyd

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  • Pontiac Master 53,816 Answers
  • Posted on Dec 21, 2016
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A problem axle will vibrate worse the faster you go but the vibration will be there up or down so for the moment I will set that aside.
if it is vibrating during acceleration but stops when the accelerator is released, it indicates and engine /transmission management problem
first I would run the fault codes as the problem could be from a faulty cam position sensor
servo/solenoid that has the cam too far advanced for the engine rpms and power setting
next it could be a problem with injector control or fuel flow/ pressure
have the fuel pressure tested at rpms to ensure that the pressure regulator is operational
what you describe occurs from misfiring or the like so go to an accredited service center for a proper diagnosis and quote
back to the axle --it could be a problem wheel bearing failing or needing adjustment so keep that in the back of your mind if nothing shows up in the fault codes or diagnosis from a shop with experience

Dariusz Zalewski

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Dariusz Zalewski
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It is possible that you have engine problem. Faulty spark plug, wire or dead cylinder may cause that problem. Unbalanced wheel may cause vibration at certain speeds too.

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  • Posted on Jan 01, 2020
Barbara Milligan
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Hello. I had problems with my wheel bearings causing issues. I had them replaced at a local shop and it fixed my vibrations. It caused problems a few months later and thankfully it was still under warranty but again it did the same thing. Vibrations during acceleration but stopped when I let off the gas. Might be worth having them check out. I think my mechanic did a free diagnostic. (We've also used them for years). Good luck and post what you find out. ????

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  • Posted on Dec 21, 2016
Jesse Garcia
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Most likely bad axle shafts

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