Bad CAT Identification
08-18-2013, 08:20 PM
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Bad CAT Identification it appears I have a bad high flow CAT. Stinks like rotten eggs...lol
Question, do you think using a lazer temperture gauge is a good way to identify which one is bad or do you suggest changing both?
Question, do you think using a lazer temperture gauge is a good way to identify which one is bad or do you suggest changing both?
08-18-2013, 09:15 PM
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Not necessarily. Cats can fail in several ways, some of which do not include being clogged. If the cat is still flowing as normal, but simply has a reduced oxygen storage capacity (thus increased tail pipe emissions and SES light) then you won't see any difference in temp reading, but the cat is still "bad" for the purposes of emissions reductions.
08-19-2013, 12:09 PM
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Rotten eggs may not be the cat at all; could be the gas
mixture is just so far wrong that it can't possibly do its
job. You need a balanced "soup" of {NOx, excess O2} and
{CO, HC} for the cat to be able to play them off against
each other. Either dead even, or flickering so fast that it
all averages out within the "storage time".
mixture is just so far wrong that it can't possibly do its
job. You need a balanced "soup" of {NOx, excess O2} and
{CO, HC} for the cat to be able to play them off against
each other. Either dead even, or flickering so fast that it
all averages out within the "storage time".