Vibration at speed


Asked by Jan 18, 2015 at 02:27 PM about the 1996 GMC Sierra 1500 C1500 SL Extended Cab LB

Question type: Maintenance & Repair

My main concern is that I have a vibration.  I notice it mainly under acceleration or at
cruising speed, but not during deceleration.  I shifted into neutral at 55 mph and can't feel
it.  I turned the motor off and coasted and can't feel it.  I checked the motor mounts by
putting it in drive and reverse and revving the engine but didn't notice any lift.

3 Answers


Is the check engine light or service engine soon light on or flashing? -Jim


No, it's not.

1 out of 1 people think this is helpful.

Ok, so we know it's not misfiring. Check things like the harmonic balancer, and the engine cooling clutch fan. HTH. -Jim

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