Question about 2000 Pontiac Grand Prix

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Front end vibration

2000 grand prix, front end vibrates when you press gas pedal while driving, does not vibrate when you let off gas pedal.

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To build upon what emissionwiz posted, the inner boot on the drivers side axle on the Grand Prix's seems susceptible to tearing. If this is the case you will see a greenish looking grease slug everywhere, even up on the bottom side of the hood.

I will second also that the CV joint can cause the vibration you speak of having personally experienced it in a Grand Prix.

Posted on Jan 06, 2009

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This is most often caused by worn out drive axle constant velocity joints or CV joints as we tech's call them, have them checked for torn boots or excessive wear, I am sure one or both will be found.

Posted on Jan 06, 2009

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It sounds as though your car has two seperate problems. The first problem with the vibration that goes away when you let off the gas pedal is caused by a bad INNER CV joint. It only vibrates when you are accelerating because that is when the joint is under stress. Your vehicle has two axles, each with an inner and an outer joint. My suggestion is to have a competent shop determine which is the bad side and replace the entire axle. The second vibration which occurs at any speed is most likely cause by either a bad tire, or a bent rim.

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