Question about 2002 GMC Sierra 2500HD

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Lifter knoking when start up 8.1 gmc moyor - 2002 GMC Sierra 2500HD

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This may be from a worn lifter that is allowing the oil to drain back . Check the viscosity of the oil you are using. If you are using a cheap after market filter be aware that some filters do not incorporate an anti drain back valve in the filter and this allows the lifters to empty m.

Posted on Feb 14, 2014


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Try a cup of tranny fluid, Dextron, or whatever, in the crankcase. Or there are lots of lifter products at your local part store. I would certainly try that first. I assume your oil has been changed recently, and the level is good. You don't have to pull the heads, but you do have to remove the intake, and valve covers.

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