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Old 11-13-2012, 12:47 PM   #3
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Join Date: Jul 2009
Location: Columbus, Ohio
Posts: 1,012
My Ride: e46- 1999 323i
Originally Posted by jfoj View Post
Not likely the MAF sensor, O2 sensors or any other sensors.

Deviation rich means you are running LEAN.

You likely have a vacuum leak.

Check the lower CCV oil return hose, fuel pressure regulator vacuum line at the filter and see the first 2 links below in my signature.
Ahh, ok, had it backwards. Makes sense I guess (ECU trying to richen fuel/air mix and deviated too far in that direction). Thanks. I will continue searching for a vacuum leak. Do you or anyone have suggestions on any other creative ways of tracking it down besides just checking the common places?

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1999 323i - 210,000 miles and counting.
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