Quote:
Originally Posted by knucklesplitter
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.
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At idle, you could easily draw atmosphere into the exhaust and then push it into the 02 sensor on the next pulse.