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Fuel trims - negative
I'm chasing a negative fuel trim issue on both banks (running rich); stock DME tuning (241E).
About -17% at idle, about -3% while driving, never really going positive. These are the long-term trims, short-term isn't significant. Seems a bit excessive. The numbers are similar on both banks.
Bad MAP sensor or O2 sensors? Leaky injectors? Overzealous pressure regulator?
Plugs changed 8k ago, already changed fuel pressure sensor, fuel tank breather valve, and donut gaskets after the header.
Is this normal? What else should I check?
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-Mike M.
2013 M3 [E92, Alpine White, ZCP, DCT]
2003 530i
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