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BMW 3-Series (E90 E92) Forum
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Serious STFT and AFR issues
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11-02-2019, 05:58 PM | #1 |
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Serious STFT and AFR issues
I am attaching a link to my datazap. I uploaded two logs while cruising that show how my STFT and AFR bounce all over the place. This issue is only at cruising. My WOT logs look nice. I have changed the spark plugs with one step colder, index 12 injectors, and both rear oxygen sensors. After reading alot I thought it was the o2 sensors but after changing them (with Bosch OE ones), the problem persists.
Current mods: dps, full custom exhaust, dcis, fmic, chargepipe and BOV, MHD stage 2. I have not changed My pre turbo O2 sensors. Not sure the age. My coils are about three years old. Eldors. Please help. This issue is super annoying. https://datazap.me/u/devildog0905/st...og=1&data=3-24
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2007 335i Coupe // DIY Single Turbo kit // JB4 with MHD BEF // Custom Exhaust
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11-03-2019, 07:01 AM | #3 |
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12-07-2019, 02:22 PM | #4 | |
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Quote:
Problem is still ongoing. I am including my most recent log showing what is still happening. So far I have changed: Front and rear o2 sensors with Bosch OE NGK spark plugs Index 12 injectors I don't know what else can be causing this. https://datazap.me/u/devildog0905/stft-issues-still?log=0&data=18-24 |
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12-07-2019, 04:19 PM | #5 |
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Both are used to determine trims. Primaries are just more important.
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2009 335i xDrive AT / 177k+ miles
PSP 750ic / Fuel-It! Stage 1 / BMS CP / Sutphin Tuning / RFP E50 11.61 @ 117.5 New setup; Covid 19Ts on RFP 93 + ARM inlets, dp, VTT cp and PSP outlets |
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12-08-2019, 06:31 PM | #7 |
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+1 for adaptation reset, use INPA
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2010 e90 335i LCI - xHP - Mishimoto - BMS - CPe - Turbosmart - MHD - Eibach - Koni - VMR - LUX
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12-08-2019, 10:00 PM | #9 |
Davy Jones, Giant Squid
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You can and see if it improves, though the only proper way to reset A/F adaptations is through INPA.
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2010 e90 335i LCI - xHP - Mishimoto - BMS - CPe - Turbosmart - MHD - Eibach - Koni - VMR - LUX
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12-09-2019, 06:07 PM | #11 |
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Unfortunately I don't have the back tech tool. I am going to try to borrow a laptop so I can try inpa (I have a MacBook). I'll see if that works. I have protools and mhd.
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12-11-2019, 07:50 AM | #12 |
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Would ProTools do it?
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ARM CP, DP, 7.5 FMIC, TiAl Q Bov MHD Stage2+/xHP/xDelete Road to 500hp daily on the way (ya right lol) -------------------------------------------------------- |
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01-08-2020, 06:21 PM | #13 |
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01-08-2020, 06:32 PM | #14 |
Davy Jones, Giant Squid
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Post a 3rd gear WOT log, curious to see if the trims are lean under load
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2010 e90 335i LCI - xHP - Mishimoto - BMS - CPe - Turbosmart - MHD - Eibach - Koni - VMR - LUX
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01-12-2020, 10:34 AM | #16 |
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01-13-2020, 04:30 PM | #17 | |
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Quote:
https://datazap.me/u/devildog0905/st...og=0&data=3-24 Small pull: https://datazap.me/u/devildog0905/sm...og=0&data=3-24 WOT pull (best I can get around here on snow tires): https://datazap.me/u/devildog0905/wo...og=0&data=3-24 Last edited by Devildog0905; 01-13-2020 at 04:55 PM.. |
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01-14-2020, 12:34 AM | #18 |
Davy Jones, Giant Squid
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Your WOT throttle trims don't look too bad but yes you are running a bit lean on both banks. I would keep searching for a vacuum leak of some sort.
Many things can cause 29E0/29E1 mixture codes, could be a sensor/air leaks/injectors
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2010 e90 335i LCI - xHP - Mishimoto - BMS - CPe - Turbosmart - MHD - Eibach - Koni - VMR - LUX
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01-15-2020, 03:39 PM | #19 |
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I just ordered 20 ft of vacuum line. I'm gonna just replace all of the lines and see what happens
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01-21-2020, 03:03 PM | #20 |
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I replaced all of the vacuum lines and the issue is exactly the same. Not sure how to do a smoke test. I am wondering if I got a bad set of injectors.
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01-21-2020, 05:23 PM | #21 |
Davy Jones, Giant Squid
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Could be...did you buy them from FCP? if so they have a lifetime warranty so you can return them
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2010 e90 335i LCI - xHP - Mishimoto - BMS - CPe - Turbosmart - MHD - Eibach - Koni - VMR - LUX
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02-10-2020, 06:02 PM | #22 | |
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Quick update. I installed my dp fix for my emission test. Seems like the problem is almost non existent now. Wierd. Any idea what that could mean? |
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