LT1-LT4 Modifications 1993-97 Gen II Small Block V8

spark adv timing

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Old 07-18-2010, 11:07 PM
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Exclamation spark adv timing

I data logged my car while it was running cause it keeps dieing and desieling after it dies. when car is at idle it says -17to -20 if i rev it it shoots from -3 to -35. something tells me thats not right. if not what would cause it?
Old 07-19-2010, 09:20 AM
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anyone?
Old 07-19-2010, 09:45 AM
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bad gas? might be optispark...

have you had it tuned? timing tables might be screwed up..
Old 07-20-2010, 12:48 AM
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opti spark is less than 4 months old (dont mean anything tho). it programmed with hypertech but i took it off. i changed the icm and seems to be better.
Old 07-20-2010, 08:28 AM
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have you checked the coil?
Old 07-20-2010, 02:16 PM
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Most of the scanners read timing in negative #s for some reason. If you actually had negative timing it wouldn't run.
Old 07-20-2010, 09:01 PM
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Wrong timing is always a negative number as in before TDC. Some scanners just do not list it as negative because that is assumed.
Old 07-21-2010, 11:03 AM
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i took a icm off of my cuzins wrecked truck and it was a 96 4.3. i beleive that was my problem cause it hasnt messed up since.



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