Dear Experts,
My german ins't that good so I will try it in english. Hopefully no problem.
For approximately a couple of months I have an extremely annoying clunking sound coming from the back of my car when accelerating. It's an BMW F11 530D production year 08/2010. Hopefully I can find the problem, although I already tried a lot of things.
The sound is the most pronounced when you accelerate with the car from standing still with the steering wheel turned completely to the left. I think I feel and hear the sound the best on the left side in the back of the car. But not completely sure. Until now 3 different garages couldn't pin point the problem. The problem is best hearable in this movie filmed from the underside of the car pointed to the left side of the car https://photos.app.goo.gl/581yLps66VoFuuAGA
The things I have tried so far:
1) Replaced both shock absorbers (fairly expensive L ) because they are active shocks problem still persists
2) Replaced the 3 differential rubbers (hell of a job) rubber 11 and 8 see link https://www.realoem.com/bmw/enUS/showparts?id=MX51-EUR-08-2010-F11-BMW-530d&diagId =33_1454
3) One of the garages found a little bit of play in the central part of the right wheel of the active rear steering. The suggestions were that it could be the bearing in this axis. I placed a GoPro under the car to film this HSR system https://photos.app.goo.gl/FscAGVZm6w7A4rpB8 I don't think I can see any play in this joint as you can see in this movie.
4) The garage told me that the problem could be the ball joint number 13 https://www.realoem.com/bmw/en…1-BMW-530d&diagId=33_1453
but that he couldn't find the play in the joint because of the pressure that the air suspensions puts on the rear axle. So I removed the air out the air suspensions and tried to find any play in the rear axle but couldn't find anything even with the air removed.
5) Checked both guibos some small hair pin tears but not as worn as the differential rubbers
I tried a lot of thing but the problem is still persisting. Hopefully one of the experts here has an idea how to continue from here because I am a little bit stocked.
Thanks in advance !