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Any duramax techs here? I have a 04 d-max with about 150,000 miles it has a knock almost like low octane knock. Still runs great. Does anyone know anything about this??
 

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I feared for my life!!!
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Not a tech, but it sounds like a sticky injector...

A pint of two stroke oil per tank quieted mine down in just two tanks.
 

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a couple friends of mine put 2 oil caps full of automatic tranny fluid in every tank of fuel and it seems to really help the sticky injector problem.
 

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Does it have a lopey idle? It may be a regulator going bad on the cp3 pump. Is you have a tech 2 or a snap on scanner you can check the pressure at idle. Watch to see if it jumps up and down. Jeff
 
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