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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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Old 03-28-2011, 08:49 AM
Mikey48 Mikey48 is offline
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Location: Charleston,S.C.
Join Date: Mar 2011
Posts: 502
Mein Auto: BMW Z4 3.0
Unhappy Running rich

I need some help please, My service engine light came on over the weekend. I took my car by the BMW Dealership and got the codes checked and the light reset. The fella in the service dept told me that my car is running rich in bank 1 and bank 2. I do have a k/n airfilter in my car do you think this could have anything to do with my car running rich ? This is the only thing I can think of. If its not the airfilter what do you think it could be. I drove 7 miles back to work and the light did not come back on. Any advice would be greatly appreciated. Thank's. My car is a 2004 Z4 3.0.
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Old 03-28-2011, 10:08 AM
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Location: Bataiva, IL
Join Date: Jan 2007
Posts: 1,578
Mein Auto: '00 M Roadster
Oiled K&N filter ?

Over oiling can affect the MAF. As the MAF reads the airflow and hence tells the ECU how much fuel to add, it would be easy to get a rich mixture.

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