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BMW 3-Series (E90 E92) Forum
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N55 Misfire/rough idle issues
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04-29-2021, 08:59 PM | #1 |
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N55 Misfire/rough idle issues
I'm about done with this car at this point, it's been months since it ran normal.
2011 335xi 105k miles mods:
Both on cold and warm starts now I can tell the engine is misfiring due to some kind of mixture control issue. Here are the codes I am getting: 2775- Air mass, plausibility: air mass too low 2BEA- Mixture control: Fuel-air mixture too lean, large deviation 2EE2, 2EF3, 2EFE, 2F03- misfiring several cylinders and always says cylinder 5 2C42- mixture control multiple fault 2BC0- Mixture control: Fuel-air mixture too lean Also here is a log of a warm idle: https://datazap.me/u/jritzgarage/idle?log=0&data=10-20 I have just changed the spark plugs and coils within less than 2k miles as well as a fresh oil change. HPFP was also done within 4k miles as well as intake valve cleaning. I've tried deleting mhd doesn't affect it. I did recently notice a sensor that it damaged, on the passenger side where the crankcase breather hose attaches right across from the coolant reservoir, I have no idea what this sensor is for however. It was completely unplugged but looks to be broken so plugging it back in did nothing. Any and all help would be much appreciated |
04-29-2021, 09:16 PM | #2 | |
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Drives: 2010 BMW 328i e92 ULEV 90k
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04-29-2021, 09:21 PM | #3 |
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Have you tried cleaning the MAF? Can you take a picture of the broken connector?
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Jritzgarage1.00 |
04-29-2021, 10:02 PM | #5 | |
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I have attached the images of the connector, I looked up the part number but it tell me nothing about what it actually is. Last edited by Jritzgarage; 04-29-2021 at 10:08 PM.. |
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04-29-2021, 10:11 PM | #6 |
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Well it doesn't sound much different from what you describe tgeho_e92 but it's a pretty violent shaking of the car and then smoothens out after about 10-20 seconds. When I pulled the old spark plugs they were covered in black as well.
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05-05-2021, 05:02 PM | #7 |
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Drives: 2010 BMW 328i e92 ULEV 90k
Join Date: Apr 2021
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Garage List 2010 BMW 328i x-Drive [0.00]
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Mine isn't violent. Almost like the computer is trying to change fuel spark and air ratios to find the proper one. I've been in a buddy's Bimmer and his doesn't do it so I'm stumped. Post on the forum when you figure it out I'm curious as hell as to what it's doing.
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09-06-2022, 09:39 AM | #8 |
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I've been getting the same codes and the same rough idle problems
Pls lmk if anyone figures this out. Btw new to the bmw community. I'm pretty sure there's a huge boost leak and I can hear air just going out everytime when I step on the gas.
Stage 1 mhd Vrsf charge pipe I've had the boost leak even before changing the Charge pipe, and I recently got the misfire codes. The car sometimes die on idle and engine struggles rlly hard wherever I put into drive. But everything is fine after a min or two. Plss help |
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10-11-2024, 01:33 AM | #9 | |
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Air was getting past the MAF basically but not enough to make it obvious. |
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