1996 GMC C2500 Setting the timimg

1996 GMC C2500
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FORCHARD
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Engine Performance problem
1996 GMC C2500 V8 Four Wheel Drive Automatic 300000 kilometers

I just had my 350 vortex rebuilt, we just installed it and it starts, just want to check the time to see if it what it should be, some say i need to do a computor scan?? can it be done with a timing light and whats the process.
tks frank
Apr 27, 2009 at 6:37 PM
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PEAR69
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You cannot use a timing light to set the timing on these engines. You can get it close but, the computer advances and retards the timing automaticaly- for this reason you need a scan tool capable of doing the timing proceedure. This usually means a trip to a dealer or a GM tech mechanic with a GM TECH 1 or 2 scan tool and software. The old days of timing your engine with a timing light are gone.

BTW - this proceedure is not easy - even with a scan tool. The setting must be within 1 degree at operating temperature. Also, the transmission is very sensitive to engine timing.
Apr 27, 2009 at 10:12 PM