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      12-06-2011, 11:29 AM   #13
M3DCTBT
First Lieutenant
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Drives: E92 M3
Join Date: May 2011
Location: New England

iTrader: (2)

The problem is quite simple: I had that AFR problem / curve with my stock tune almost exact to that OE AFR. It was based on a primary 02 fault I was experiencing. I had to clear the 02 fault first. When that lean the car will lose a ton of power from timing retard. I rectified the issue and it's a brand new car.