Question about Pontiac Cars & Trucks
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Posted on Jan 02, 2017
Have your car raised up to check the engine/transmission mounts. Also the turbo-charger needs inspection to be sure carbon deposits not
affecting its rotation
Posted on Oct 25, 2009
vibration at highway speeds is normally a tire balance issue. take it to a tire shop and have them inspect and balance the tires.
Posted on Feb 21, 2010
I would first check the u-joints on the driveshaft if the problem only happens when the speed is between 62-75mph. Then check all the tires for lumps or bulgesin the sidewall or tread surface. The tires may also be out of balance and bouncing at that speed. If the vibration occurs only when the engine is around 2000rpm, check the pulleys, serpentine belt and anything driven by it for looseness. Also, check the trans mount to see if it is loose or broken. If everything checks out ok, have the OBD codes checked to see if anything might be causing the engine to surge.
Posted on Aug 17, 2010
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