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kevinph

05-01-2011 08:44 AM

Spark Advance Variation at Idle

2 Attachment(s)

I am surprised at the amount of spark advance variation I see at Idle on two blazers I am working on. One is a 96 and the other is a 98. The two attached graphs are from the 96. Same range on the 98.

Does anyone have an opinion on what is normal spark timing variation?

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