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knucklesplitter · 2007-11-13, 08:34 AM

I don't see how a header crack would affect your idle. The O2 sensor measures the A/F *ratio*, so even if there is a leak the ratio stays the same. But.. I hope it fixes your problem, and if it does I would like to know how.

2007-11-13, 08:34 AM	#26
knucklesplitter EJ205 Real Name: Matt Taylor Join Date: Jun 2005 Location: Cousin-Fck, Carolina Posts: 1,475 Wish in one hand and sht in the other...	I don't see how a header crack would affect your idle. The O2 sensor measures the A/F ratio, so even if there is a leak the ratio stays the same. But.. I hope it fixes your problem, and if it does I would like to know how.