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Originally Posted by bobcowan
You can't reliably clean an O2 sensor. Once you get it all fixed and tuned, replace it.
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Bob - I didn't make it clear. I meant I cleaned the mass air flow sensor. The throttle body looks like a carb, with flow sensor sitting on top. With the cam and the low rpm cold idle it tossed oily fumes up on the sensor. At least that is my theory.