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Old 09-19-2006, 10:07 PM   #11
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I ran through the rest of the 100 LL, and put in premium, and it cleared up......I'm confused, I thought higher octane fuel was supposed to kill KR, not make it worse. Is it the lead?
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Old 09-19-2006, 11:12 PM   #12
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Lead can kill an O2 in short order, and a Cat over a slightly longer period of time. You may have run a small enough (low enough) amount that it only coated the O2 enough that the follow-up fuel removed the residue from the sensor.

You might have just found your problem, AND saved the O2, but keep it in mind in the future.
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