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Originally Posted by AUDIOGUY
I cleaned my MAF and cleaned and re-oiled my EVO filter this weekend... car definately runs better. Smoother idle and no bogging out. CEL is back on now though. I may have a bad 02 sensor somewhere??
Who knows. I am not into going to have it looked at by a pro right now. I have a
feeling they wont know any more than myself.
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Well, check the codes again.. If its the same ones, 1128 and 1130, the o2 sensors are kinda ruled out. you have four o2 sensors, two for each bank. one "upstream" of the cat, and one "downstream" of the cat... the chances of one sensor causing both banks to run lean are remote, and the odds of two or more sensors failing at the same time are remote as well.. Keep lookin for a common cause for both banks. Vacuum leaks & stuff. If all else fails, MAF replacement might be in order...
side note: dont forget to check the air tube from the maf sensor to the Throttle body. any cracks or leaks there, will also cause the lean condition. The MAF only measures air that flows across it. any air that gets into the engine behind the MAF will not be accounted for in the fuel delivery calculations...