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02-12-2017, 05:23 PM | #1 |
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Join Date: Dec 2014
Location: Coal City, IL
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Advancing ignition timing on 5.7 vortec
I have a 1996 Cheyenne with a 5.7 vortec, 5-speed, and 3.42 locker rear. I was wondering if I can physically advance the ignition timing by turning the distributor. Or can it only be adjusted through programming?
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Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker |
02-12-2017, 07:29 PM | #2 |
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Re: Advancing ignition timing on 5.7 vortec
Nice truck! Nope, no dice on advancing with the distributor. The ignition module takes the signal from the crankshaft position sensor and only sends a charge as each cylinder reaches TDC. Turning the distributor only moves the cylinder contact away from where the rotor tip is trying to send a charge. No ignition advance there, I'm afraid.
I suppose the reluctor that rotates past the crank sensor could be modified to advance timing a few degeees, but I doubt that you'd want to go that route if it can be done with a computer.
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02-12-2017, 09:55 PM | #3 |
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Re: Advancing ignition timing on 5.7 vortec
Thanks for the info. That's what I was thinking but not sure about.
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Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker |
02-13-2017, 08:11 AM | #4 |
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Re: Advancing ignition timing on 5.7 vortec
You would need a tune.
Even if you did advance/retard the reluctor at the crank, you would get a cam/crank correlation fault code. You could then perform the cam/crank relearn with a scan too, which would get you back to square one. |
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