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Old 07-19-2021, 10:18 AM
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andrewwynn andrewwynn is offline
Join Date: Jun 2015
Location: Racine, WI
Posts: 8,214
andrewwynn will become famous soon enough
Originally Posted by 80stech View Post
@andrewwynn There is nothing wrong with your cats. brahahaha!


With new MAF the average voltage dropped 0.2 on post cat sensors and the short term trims flipped from positive to negative. I have to wait a couple drive cycles to see the long term trims to see if they finally match polarity.

When long term and short term trims are opposite, what I've read indicates that's likely MAF. Early indications are that's true

The post cat readings aren't as smooth as I would like but possibly the cats need to burn out some whatever from running lean for so long.

I did order some angled defoulers which should squeeze out another year or three out of the cats as it worked on wife's e53.
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
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