BMW F10 N57 30D with black smoke

[kaleval]

Hi guys,

Maybe here can get a bit help for a correct trouble diagnose.
There is a BMW from 2010. 30d with N57 6 cyl. engine.
EGR off
DPF off
I haven't got more detail about modifications.
MAP sensor and Oxygen sensor replaced in a week, did not solve the problem.

Customer comes for diagnose the engine because feels loss of power and visible black smoke on accelerate.

Measured smooth running : correction stays between -0.8 and not higher than 1.2
With cold engine, start attempt finish with drowing, engine shaking the body.
With a little throttle the rpm stays about 1000 and about one min its stays alive at idle, with huge amount of blue smelly smoke.
After that, when engine warming up, rpm goes flat, smooth running values stays between -0.7 and 0.8

Airmass nominal and measured value about ~60
Tubor charger norminal and measured follows each other.
Rail pressure nominal and measured at idle 350 , on throttle follows.

With warm engine at kickdown the car feels lazy and black smoke behind.

Odo 342 234 km

Can't hear any noise about the timing chain.

Anyone has idea where to start the troubleshooting?

[sniegavirs]

Check swirls in intake manifold. They tend to clog and stuck in closed position.

[Hasnain Amjad]

Hello, praying you are still active. Did you ever get to the bottom of this? My car has the exact same symptoms