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my dad's car just failed smog at 15mph (1908rpm)
it says: NO (PPM) max is 517 and he got 536
how would he get this number down. you think sense its so close an oil change would do it. its been at least 6K sense the last oil change. im doing the oil tomorrow but is there anything else.
well replace the PVC, tune up, back the time off about 5 degrees, hotter stat. make sure all vacuum lines are not leaking..if these don't work then look at the o2 sensor then the converter