Mixture control codes in cold weather on ethanol fuel mixes?

iqraceworks · 04-26-2022, 12:51 PM

Switched over to my E40 tune (ran 93 all winter). It was really cold this morning (38f)...the car fired up and idled nice and smooth but threw 29E0 and 29E1 mixture control faults. Reset the codes, ran fine all afternoon. Are mixture control faults common on ethanol fuel mixes in cold weather? Ran the same tune all last summer and never had any issues.

Saif2018 · 04-26-2022, 06:00 PM

Quote:

Originally Posted by iqraceworks

Switched over to my E40 tune (ran 93 all winter). It was really cold this morning (38f)...the car fired up and idled nice and smooth but threw 29E0 and 29E1 mixture control faults. Reset the codes, ran fine all afternoon. Are mixture control faults common on ethanol fuel mixes in cold weather? Ran the same tune all last summer and never had any issues.

Could be map related, from what I read if you have mixture codes on both banks. Might be a good idea to ask your tuner.

The other causes are injectors or O2 sensors.

RnmEvo9 · 04-26-2022, 06:05 PM

I always throw mixture codes whenever I run my e85 maps from different tuners. My injectors and o2 sensors are relatively new as well.

iqraceworks · 04-27-2022, 07:02 AM

Maybe it was just a fluke and the DME has to get used to the new ethanol mix? Fired the car up this morning...no issues, runs like a top.

04-26-2022, 12:51 PM	#1
iqraceworks Brigadier General 2002 Rep 3,731 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Mixture control codes in cold weather on ethanol fuel mixes? Switched over to my E40 tune (ran 93 all winter). It was really cold this morning (38f)...the car fired up and idled nice and smooth but threw 29E0 and 29E1 mixture control faults. Reset the codes, ran fine all afternoon. Are mixture control faults common on ethanol fuel mixes in cold weather? Ran the same tune all last summer and never had any issues. __________________ 2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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04-26-2022, 06:05 PM	#3
RnmEvo9 Banned 247 Rep 1,827 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Pembroke Pines, FL iTrader: (2)	I always throw mixture codes whenever I run my e85 maps from different tuners. My injectors and o2 sensors are relatively new as well.
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04-27-2022, 07:02 AM	#4
iqraceworks Brigadier General 2002 Rep 3,731 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Maybe it was just a fluke and the DME has to get used to the new ethanol mix? Fired the car up this morning...no issues, runs like a top. __________________ 2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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