Exhaust System From headers to exhaust tips

icm

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Old 02-17-2015, 01:15 PM
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icm

just wondering is there a difference in the icm ? for y bodys f bodys or b bodys ? like more spark adv. or less
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Old 02-17-2015, 04:12 PM
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Re: icm

Gotta post in the correct forum to get responses.... this is "Exhaust System".

The ICM does not set spark advance. It simply takes the "fire coil" signal from the PCM, and tells the coil to fire. Ignition timing changes have to be programmed into the PCM.
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Old 02-17-2015, 04:14 PM
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Re: icm

Sorry about that and thanks alot
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