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Bimmer55 Bimmer55 is offline
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Join Date: Mar 2017
Car: 2009 335xi
Default N54 single Turbo Vibration and misfire Help!! - 08-06-2019, 12:18 PM

I've been trying things to figure out why my car misfires and vibrate at idle like I have no mounts for a week now, car also feel like its low on power I have used index 12 injectors, rebuild HPFP from FPC Euro with 3k on it. My NGK plugs have about 5k miles on it with correct gaps. I pulled plugs when this all stated and they all looked normal. .When resetting adaptation vibration goes away for a few seconds then comes back. I've changed both wideband sensors 2 days ago the reason I changed it because I was getting too much AFR variations . For example bank 1 would lean out to 15.7 idle 1 week after adaptation rest. Now this same symptom went on bank 2 and bank 1 fine now . Did valve cover gasket, also made sure there was no cracks in valve cover nor its clogged up ( I let my valve cover sit in gasoline overnight then I sprayed it with engine degrease to completely clean it) . No leak in or clogged issues . I changed Purge valve due to RPMs variations at idle , ekpm3 module and programmed it. swapped all 6 coils with used ones, changed fuel sender unit (new) , changed fuel rail sensor with used one I had, cleaned vanos that didnít help , then I got another set of used vanos and tried those too didnít help . Reflashed my tune, updated jb4 with latest software, did a compression test which is normal when hot. Did walnut blasting . My walbro 450 lpfp stays at 62 and I've seen it dip to 55 thatís what prompted me to change Ekpm3 module after the swap I still get same lpfp psi . At this point I have no solution for this issue why my engine is vibrating and misfiring at idle but not at wot but I am still getting vibration by just revving engine to 2k or higher.
I have 0 codes regarding misfires.
Codes I have
2aaf, 2fdb and 2aae sometime is get 30ff code which im not sure why, my car boost fine.

I have 2009 E92 335xi on a single turbo running 93 octane with JB4 and MDH map tuned by Ken. Map 1 only for now.
Log attached 2nd gear not a full range of rpms log.
I noticed my cylinder 1 ing is all over count this be it?
Attached Files
File Type: zip Log.zip (22.1 KB, 12 views)
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Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Posts: 5,423
Join Date: Apr 2014
Car: E92 335XI
Default 08-07-2019, 10:16 PM

Can you upload the CSV File?

Based on symptoms- it could be something hitting the subframe? How violent is the vibration?


e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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