Post-shift fuel trim flatline... da helllll

335is-dct · 07-07-2016, 11:57 AM

what could be causing bank 2 fuel trim to flatline to 0 immediately post shift, and remain there at wot?

very unsettling, as a/f on that bank leans out noticeably. is the car falling out of closed loop fueling?

muncie21 · 07-07-2016, 01:17 PM

My first WAG would be the O2 sensor on that bank. Swap your O2s and see if the problem follows the O2.

BQTuning · 07-08-2016, 04:08 AM

Too much fuel

07-07-2016, 11:57 AM	#1
335is-dct Second Lieutenant 184 Rep 232 Posts Drives: 335is Join Date: Dec 2015 Location: south florida iTrader: (0)	Post-shift fuel trim flatline... da helllll what could be causing bank 2 fuel trim to flatline to 0 immediately post shift, and remain there at wot? very unsettling, as a/f on that bank leans out noticeably. is the car falling out of closed loop fueling?
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07-07-2016, 01:17 PM	#2
muncie21 First Lieutenant 122 Rep 397 Posts Drives: 335ix Join Date: Sep 2015 Location: PA iTrader: (0)	My first WAG would be the O2 sensor on that bank. Swap your O2s and see if the problem follows the O2.
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07-08-2016, 04:08 AM	#3
BQTuning Banned 469 Rep 4,392 Posts Drives: 2012 Z4 sDrive35i M Sport 6MT Join Date: Nov 2010 Location: bq@bqtuning.com iTrader: (0)	Too much fuel
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