Question about GMC Sierra 1500
1. Remove the alternator & accessories drive belt out from the engine, and start again the engine. Listen the engine running regarding this very noticeable knock. If it will dissappear, check the crankshaft pulley, the belt tensioner, ... Replace bad pieces.
2. If the very noticeable engine knock still occurs, you need to use an engine stethoscope tool for carefully listening the engine block area & cylinder head area. It could be a valve rocker arm knock or a piston knock, depending of the noise area.
Posted on Apr 10, 2011
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Posted on Jan 02, 2017
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