Thread: SMOG help
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Old 09-27-2012, 07:24 PM
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drivinfaster drivinfaster is offline
bimmerfest Supporting Member
Location: in the sticks you piney
Join Date: Nov 2007
Posts: 11,753
Mein Auto: rescued bmw's
nox is caused by high combustion temps, so i'd suggest a can of seafoam through the intake. clean out the carbon.

also, i'd replace the o2 if you do not kow how old it is. it costs less to replace it than to have it scoped at a shop.

check your fan clutch as well, and in the end, if nox does not change, you may need to replace the cat.

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