Question about 2002 Pontiac Grand Prix

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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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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

Posted on Dec 21, 2016

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Most likely bad axle shafts

Posted on Dec 21, 2016

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1 Answer

I have a 2004 grand prix, When you are driving down the highway, and you take foot off gas, there is vibration


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I have a 1997 landcruiser,when driveing at 40 to 50mph a vibration appers when accelerating up to 70mph it gets worse take foot of accelerater goin down hill thers is no noise or vibration


Check your universal joints in the drive shaft. When you remove your foot fromt the accelerator you are no longer applying power to the rear wheels and in turn there is no load on the drive shaft. When you accelerate below 40mph, there isn't enough centrifugal force to cause the driveshaft to wobble, but once you go above 40mph, it begins to show slop.

Another thing to check is your wheel bearings.

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How many miles on your Durango? This could be a failing U joint on either driveshaft. Could also be a ties out of balance or going bad.

Since the vibration goes away when coasting, I am voting for a driveline issue.

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