Question about 1997 Pontiac Grand Am

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I ha ve a grand am 97 when i acelered to 40,000 rpm the motor rumble and go down to 30,000 rpm and go up and down i don't know what happen

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You must mean 4000 to 3000rpm. A 1997? Unless it was't taken good care of it shouldn't have hurt it. A lot of front wheel drives have "rumbles" from normal wear and tear. Check all of the belts and pumps for any things that may unbalance the motor such as loose belts or the devices themselves. Automatic transmissions can make this rumble too. Do not go that high in acceleration unless motor has a load on it for that vehicle being old.

Posted on Jan 02, 2011


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