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scarceller scarceller is offline
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Join Date: Oct 2006
Location: Southern MA
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I'm sure a new CAT will help pass emissions.
But what has my eye is the high NOx number, this is usually the result of a lean running condition.

I suggest the base mixture be checked and reset if need be. It can easily be done with a CO meter or better yet a Wide Band O2 gauge. If you use the WBO2 you should target a base mixture at idle of about 14.0AFR with the O2 sensor disconnected. Just follow the Bently manual for this procedure.

You really should double check the base mixture after you replace the cat.
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1984 911 Carrera Cab M491 (Factory Wide Body)
1975 911S Targa (SOLD)
1964 356SC (SOLD)
1987 Ford Mustang LX 5.0 Convertible
Old 02-20-2019, 07:40 AM
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