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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > E90 N55 lean/rough start issues



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      02-08-2021, 01:48 PM   #23
Jritzgarage
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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.
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Last edited by Jritzgarage; 02-08-2021 at 03:39 PM..
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      02-09-2021, 10:06 AM   #24
9krpmrx8
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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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      02-11-2021, 10:56 PM   #25
Jritzgarage
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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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hpfp, lean, rough start, vanos solenoid


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