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#9 (permalink)

07-16-2008, 08:06 AM

Jerry Clayton Jerry Clayton is offline

CC Member

Join Date: Jul 2005

Location: Bartlett, Ill

Cobra Make, Engine: Everett-Morrison LS1

Posts: 2,448

Not Ranked

have you been running leaded gas?????We constantly see computer controlled engines that have have leaded fuel run contaminating O2 sensors which then throws off the tune. I would suspect in your case that the fast system thinks everything is alright because of a bad sensor

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