Look for anything hitting on the engine to firewall or frame, downpipe included. It should be more constant than what you are seeing if it's true knock. Engine temp and IAT2's make a difference in the timing tables also. Is it always when fully warmed up?
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DD - '08 Cobalt SS/TC, Trifecta & HP Tuners combo tune, 3 bar GMPP MAPs, MAFless SRI, Injen hot side CP,
ZZP cold side CP & MAF relocate, Catless DP & adj clutch rod, SPEC Stage 2+ Clutch & Lightweight Flywheel, OTTP Stage 1 mounts
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02-06-2010, 07:17 AM
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