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BMW 3-Series (E90 E92) Forum
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What can cause fuel trims to not work sometimes?
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09-16-2012, 11:38 PM | #67 |
Reborn
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It believe the AFR reading is correct. The trim flatlines, then AFR shoots up, car loses power, and then I let off. I think there is some condition (caused by tune) that causes the DME to not add fuel trims.
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09-16-2012, 11:53 PM | #68 | |
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What BMS is doing with the Cobb base flash and Vishnu with their base flash, is to proactively target the correct AFR/scalar instead of having to bump up against this DME limit. Historically, pump gas with methanol injection proved to be more than adequate for stock turbos with the piggyback fuel approach, however with the new E85 craze, the DME is operating closer to those limits due to the increased flow requirements of E85 thus forcing BMS/Vishnu to stack piggyback with a base flash.
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11-09-2012, 09:49 AM | #70 |
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Had identical issues here
As odd as this sounds (trust me I know it sounds stupid) Take the car into redline in 2nd... Before shifting to 3rd... Seriously, it solved this same issue for me |
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10-10-2013, 11:07 PM | #71 |
Black on Black on Black.
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Holy bump... What was the fix for these cars? I'm running into the same problems. Maxed +34% fuel trims OL set to 100% and I'm not running any e85 at all. In fact I installed an inline pump hoping it would help. No change. Firmware / maps recently reflashed with no change.
Is this a dying hpfp? Injector? |
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10-14-2013, 10:28 PM | #72 | |
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This was a long time ago though. May have been fixed, or maybe it's something inherent to the DME. Not really sure. I was never able to confirm this 100%, but it seemed like the problem/solution.
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Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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01-14-2016, 05:13 PM | #73 | |
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04-30-2018, 09:21 AM | #75 |
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Bumping an old thread because I’m having the same issue. Bank 1 trims occasionally flatline at 0 under mid throttle causing lean condition then it recovers seconds later. Anybody find the solution?
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03-18-2019, 10:11 AM | #77 |
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Drives: 2010 335i
Join Date: Jan 2011
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bump... having same issue now.. any update?
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2010 335i Coupe / 6MT / MHD | FBO+ MMP S3 /AUBURN WDE / PATRIOTS / CELTICS / REDSOX
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09-18-2020, 07:50 PM | #78 |
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Fuel Trim Maxes no codes
My fuel trims are maxed out but I have no codes. The car idles rough and gets worse when I turn on the AC. Also have a loss of power but can still drive around town, just takes a little longer to get up to speed. I have tried the following:
Spark plugs Coils Reset adaptations Replaced 4 O2 sensors MAF and MAP sensors Ignition Coils Not sure what else to do. The exhaust note sounds a little different, kind of fluttery. Could an exhaust leak cause this? |
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