[icyhot12]

Hello to everyone,

I have a serious problem with strange sound in my car. It started 2-3 months ago and I don't have new ideas what it could be.

It happens only when I am accelerating, there is no dependence between cold and hot engine.
When I am trying to "generate" this sound I notified that it occurs between 3k-6k RPM's.
I don't have any other problems with engine. During this sound the engine is still running smooth and the car has it's power.
Here is link to my record:

https://soundcloud.com/user6981240/e90-325xi-chrobotanie-silnika

You can hear it exactly from 3:20 and later too.

There are some days when I don't hear the sound and enigine is running good for few kilometers.

I will appreciate any ideas.