[Dr.Dinkelberg]

2015 bm3 fbo stage 2 M235i 60k miles is stuttering in first and second gear as I accelerate.

It won't stutter after 3.5k rpms or higher gears.

I have changed spark plugs and coil packs. No codes are showing up but if I turn the car on and drive it won't stutter. Once the car becomes warm it starts to stutter and get worse.

In the video you can slightly see the stutter.

Does anyone know what it could be? Been through it? Hear of something like this before?

[MechEngineer]

Is your car xDrive? This sounds like a pretty common issue where the transfer case fluid goes bad and you get some clutch slip.

I had this exact same issue and changing the transfer case fluid fixed it for me. You can also try the xDelete app which disables xDrive by leaving those clutches open.

[whoismorggan]

Originally Posted by MechEngineer

Is your car xDrive? This sounds like a pretty common issue where the transfer case fluid goes bad and you get some clutch slip.

I had this exact same issue and changing the transfer case fluid fixed it for me. You can also try the xDelete app which disables xDrive by leaving those clutches open.

+1 transfer case, same happened to me. Turned on xDelete and it's smooth sailing