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rnd62 6/24/2012

1994 Chevrolet K2500 Silverado 8 Cyl 5.7L


pre ign knock? hard ping?ROD knock?

under load or just taking off sounds like pre ign knock or ping hard ping. I checked timing with lite and its rite on. Can tbi be running lean and or the knock senser have something to do with it? or can the computer change the timing internally and im not seeing with lite. This just started doing this and happens under load. i have 40psi oil and truck runs ok its kinda always been under powered i thought. Im going to cut oil filter to make sure its not a bearing but with steady oil pressure and no vibration ???? any suggestions

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