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NEUMANNZZ · 10-23-2008, 10:48 AM

A timing light is good for checking to see if timing is advancing. setting timing. checking timing to see if the ecm retards timing due to knock. checking for erratic timing(internal mechanical issues, ie timing chain loose)

10-23-2008, 10:48 AM	#78
NEUMANNZZ GMC RULZZ Join Date: Mar 2005 Location: San Diego Age: 43 Posts: 9,764	Re: 1991 chevy 1500 5.7 tbi erratic idle A timing light is good for checking to see if timing is advancing. setting timing. checking timing to see if the ecm retards timing due to knock. checking for erratic timing(internal mechanical issues, ie timing chain loose) __________________ O2 GMC RCSB 4.8L V8 AUTO 3.73's rebuilt/beefed up 4L60E(at 43,000miles) Matching Ninja 500r