bhardwaaj Posted March 30, 2011 Report Share Posted March 30, 2011 the engine is having a knocking noise which only starts on high speed i have done 80,000 on my Silverado LT 6.0L Link to comment Share on other sites More sharing options...
chevydude Posted March 31, 2011 Report Share Posted March 31, 2011 It may need major service and some consumable at engine level too. Check the manual and see what all is needed, do that first and see if still have knocking. All u know it cud be low oil level, or bad spark plug. If not, it might get serious to open the half engine to check and repair so in that case get the computer test done and if you cant find any reason in that. Go for compression test for all cylinders and see if all reading is in +- 10 -20 PSI range. Link to comment Share on other sites More sharing options...
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