[taragachov]

Hello everyone. i have MAF readings around 12-16 lb/min at idle, and i have rough idle on cold start only at first stop light, it almost stall one time and then runs without any problems. I have already cleared MAF Sensor, no luck. wondering if my sensor is faulty. any help would be appreciated. P.S. Screenshot from BM3 datalog uploaded.

[thejeremyman9]

- You need to post the actual datalog, not a screenshot
- idle/part throttle log generally not helpful unless you log the specific issue/event occuring, need WOT log https://f30.bimmerpost.com/forums/sh...php?p=26340913
- provide info on car/miles/mods/tune/mileage/etc
- did you try running with MAF unplugged and confirm issue does not occur
- scan for codes

[taragachov]

Originally Posted by thejeremyman9

- You need to post the actual datalog, not a screenshot
- idle/part throttle log generally not helpful unless you log the specific issue/event occuring, need WOT log https://f30.bimmerpost.com/forums/sh...php?p=26340913
- provide info on car/miles/mods/tune/mileage/etc
- did you try running with MAF unplugged and confirm issue does not occur
- scan for codes

Yes, today i unplugged MAF sensor and it runs smooth, seems to be a vacuum leak?

[thejeremyman9]

Vacuum/boost leak post MAF, MAF itself, or MAF wiring. Depends on the codes you are getting.