How many 02 sensors are on an 89 Chevy 454 dually?
My emissions on the high rpm test were too
high and I was told it was probably the 02
sensor or the cat. The cat is only a year old
and the rebuilt motor has less than 1k miles
on it so I don't think it's the cat.
should only be one, I would like to know what gas it was that was too high
Co% max is 1.5 my amount measured was was 2.91 on the idle test. At 2544 rpm.It passed everything else
ya, o2 sensor seems like a good place to start
Thank you very much
If not the sensor any other guesses?
if its not a bad sensor then something is throwing it off and its not burning clean, high fuel pressure (not likely unless you have modified it), leaky injector, timing issue, or the new cat isn't working as they should.
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