Knocking

Asked by Jun 24, 2016 at 09:56 PM about the 1997 GMC Sierra 1500 K1500 SLE 4WD Extended Cab LB

Question type: Maintenance & Repair

My Sierra1500 gmc sle knocks when it
runs. No starting problems.  Lifters?

1 Answer

50,735

There is knocking and there is ticking. Ticking is usually related to lifters and the valve train, but knocking can be rod or main bearings or other serious issues. Check the oil as it may be low.

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