Engine Knocking Noise problems of the 1999 GMC Sierra

Two problems related to engine knocking noise have been reported for the 1999 GMC Sierra. The most recently reported issues are listed below.

1 Engine Knocking Noise problem

Failure Date: 02/21/2006

: the contact stated a knocking noise was heard momentarily when starting the vehicle. The vehicle has been taken to the dealership 3 times who determined the pistons were knocking. The problem cannot be repaired. The dealership informed the contact of a TSB #010601028a. Updated 3/9/2006 -.

2 Engine Knocking Noise problem

Failure Date: 03/06/2000

Consumer states there is a loud knocking sound in engine every morning at start up, dealer could not find the cause, the manufacturer offered the consumer a warranty on the engine, consumer still experiencing problem.

Other Engine And Engine Cooling related problems of the 1999 GMC Sierra

Gasoline Engine problems	3
Manifold/header/muffler/tail Pipe problems	3
Engine And Engine Cooling problems	3
Engine problems	2
Engine Knocking Noise problems	2
Engine Cooling System problems	2
Engine Exhaust System problems	2
Engine Failure problems	1
Catalytic Convertor problems	1

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