Mechanics

GMC SIERRA RPM PROBLEM

1992 GMC Sierra • 6 cylinder 2WD Automatic • 170,000 miles

My 1992 GMC 1500 sounds like a jet engine taking off. Could that be a worn fan clutch.
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1992 GMC
March 3, 2011.




My hearing is no good. I'm not good with noises. Your rpms are ok? Exhaust is ok?

JDL
Mar 3, 2011.
The exaust is good but high rpm.

Tiny
1992 GMC
Mar 4, 2011.
Any mil codes? Clean the throttle-body, check iac/idle air control. Check for vacuum leaks. If you block the mouth of the throttle-body any effect on the idle?
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JDL
Mar 4, 2011.
It was the fan. And I replaced the valve stem seals and now it smokes worse than it did before, I was told that will go away?

Tiny
1992 GMC
Mar 7, 2011.
Glad you got it going your way.

JDL
Mar 8, 2011.

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