After few weeks of tractor-like idle, a few codes finally showed up.

[DannyRA]

Hello,

After a few weeks of extremely rough idle, the car finally threw codes. Not sure why there was a delay. The car is on Shell 93 with no aftermarket intakes- in relation to googling air mass too low. It almost sounds as if only one side of the motor is firing for every 3-4x times the other side does. Imagine the most extreme Corvette cam, even more. The car on occasion has some white smoke from the tailpipes but I believe has to do more with external temperatures. I clear codes but they still come back. I have no reliable BMW tech around me now in my new city so I'm trying to find the problem and see if I can fix it myself or find a mechanic that comes to the same consensus. Thank you all.

Here are the codes pulled from bootmod3:
102902 Air mass 2, plausibility: air mass too low
102E11 No description available
102002 Air mass too low
118001 mixture control: mixture too lean
118101 mixture control 2: mixture too lean
119304 rail pressure sensor, plausibility: pressure too high before engine start
102A32 air mass meter, workspace: air mass too low

After clearing, they all returned fairly quickly.

[coldsoup]

How many miles? Maybe clean out the maf sensors? Could be something super minor as that. 🤞 good luck Op.

[DannyRA]

Originally Posted by coldsoup

How many miles? Maybe clean out the maf sensors? Could be something super minor as that. 🤞 good luck Op.

2019, 20k miles. I'll see that as a current option.

[TopJimmy]

Check that all of the connections of the small black air tube are well secured. This air tube runs from the J-pipe up to the front long intake pipe. It's a very common spot to find a leak causing "plausibility" codes.

[DannyRA]

Originally Posted by TopJimmy

Check that all of the connections of the small black air tube are well secured. This air tube runs from the J-pipe up to the front long intake pipe. It's a very common spot to find a leak causing "plausibility" codes.

Checked and seems all secured.

[Suds]

Are you tuned and reluctant to take it to a dealership?
My M2 & M4 are both tuned and get serviced at a local dealer so no shame there.

[Wanted_M]

Sometimes oiled aftermarket filters or dirty filtration slowly foul the sensor, use a MAF spray cleaner from auto part store and see if that works. I had to do this on my daily commuter Lexus IS and its been running great since. I had a CEL and three of the OBD codes you show, fuel lean mixture since affected STFT and LTFT and Air mass flow sensor low. Good luck.

[DannyRA]

Originally Posted by Suds

Are you tuned and reluctant to take it to a dealership?
My M2 & M4 are both tuned and get serviced at a local dealer so no shame there.

Yes. The car has a built motor and upgraded turbos. Unfortunately the dealer most likely wouldn't touch it with a 10 foot pole. I'm roughly 7 hours away now from the original shop that put everything together and the closest some what reputable shop is 3hrs away which is sketchy when the car stutters. I feel that I can trust it for the trip but I am not sure.

[DannyRA]

Originally Posted by Wanted_M

Sometimes oiled aftermarket filters or dirty filtration slowly foul the sensor, use a MAF spray cleaner from auto part store and see if that works. I had to do this on my daily commuter Lexus IS and its been running great since. I had a CEL and three of the OBD codes you show, fuel lean mixture since affected STFT and LTFT and Air mass flow sensor low. Good luck.

I'll try this. Also noted that by coolant is just slightly over the lower level of the yellow "buoy." Not sure why because last time I checked fluids, it was perfectly fine.

[M6Roar]

Did you figure out the issue?