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BMW 3-Series (E90 E92) Forum
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E90 N55 lean/rough start issues
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02-08-2021, 01:48 PM | #23 |
DIY-ER
2
Rep 21
Posts |
Well it still is not complete fixed apparently. I reinstalled mhd after generating and updated backup and I also found my charge pipe map sensor was bad, I now have a 3.5 bar sensor form fcpeuro installed, with the proper selection in mhd and tune at stage 1+. Car seems to run fine most of the time, however I’ve had multiple times now when I start the car and it is misfiring consistently until for like 20 seconds to a full minute if I don’t give it some gas. I noticed my fuel trims when warm where 6-8% which is not a good sign so I reset all the adaptations and it brought it down to 4% pretty steady but it doesn’t seem to stay there after a week or so it goes back up slowly. I still have a lean fuel air mixture code, and it seems that under full throttle it misfires sometimes in the upper rev range.
Last edited by Jritzgarage; 02-08-2021 at 03:39 PM.. |
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02-09-2021, 10:06 AM | #24 |
Clean is the new cool, keep it that way.
814
Rep 1,685
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Can you take at log at idle for 30 seconds, no throttle input, with the engine fully warm and share it here?
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2011 335i, FBO, N55+ Turbo, full E85, S55 intercooler, etc.
2015 X5 35i Xdrive |
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02-11-2021, 10:56 PM | #25 |
DIY-ER
2
Rep 21
Posts |
https://datazap.me/u/jritzgarage/war...og=0&data=4-20
Here’s the link, I noticed the car feels as though it misfires more commonly now while actually driving. |
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Tags |
hpfp, lean, rough start, vanos solenoid |
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