Clonking sound rear BMW F11 when accelerating

rbm · 28. März 2022

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 !

MunichMark · 29. März 2022

A good BMW Garage can work the active suspension front and back throughout its full range and can perhaps find something more on a lift with and without weight on wheels.

The Guibo’s should have no cracks whatsoever although hard to believe that’s the issue.

Since it does this with full left deflection I almost wonder if it’s up front but if so one would normally feel something in the the steering.

rbm · 29. März 2022

Dear MunichMark. Thanks for your answer. I definetely feel it in the rear so I don't thinks it's comming from the front. It's really strange that not one garage has found the problem so far. It almost seems to come from close to the camera https://photos.app.goo.gl/581yLps66VoFuuAGA in this movie. The guibos don't look to wrong. See pictures. Have no idea where to go from here.

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MunichMark · 29. März 2022

Can’t hear anything with the Video… what I do see is that the Guibo’s appear to be oily… Any leaks from the Differential or other points ?

Was the Differential Oil ever changed ? If not Drain / Suction out and look for any metal debris ? just a WAG…

(Für die Deutschen WAG = Wild Ass Guess… SWAG = Silly Wild Ass Guess

MunichMark · 30. März 2022

Another WAG… When the Differential Mounts are replaced the entire Exhaust has to be lowered / removed. I found a post where there also was some thud like noises but mostly when cold and warming up.. It turned out to be the exhaust was not hung right and under load.

**AltinB1306** · 30. März 2022

I believe that it‘s the differential. HSR wouldn‘t do that clonk. It‘s a different sound.

rbm · 30. März 2022

Dear MunichMark: It really doesnt sound that its coming from the exaust because you all so feel the back of the car moving. So not only sound but also something in the suspension or differential.

Dear AltinB1306: Is there an easy way to check the differential. Maybe use the GoPro? Do I need a repair set something like this than?

https://www.auto'doc'.nl/gsp/10016733

sincerley

MunichMark · 31. März 2022

Just fyi; https://www.bimmerfest.com/thr…ms.1347129/#post-13673194

rbm · 2. April 2022

Tried to find play in the rear axle couldn't find any when both rear wheels where on stands and the gear in neutral. Today I was thinking don't you guys think it could be the active rear sway bar because there isn't any play in the suspension? See movie

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rbm · 2. April 2022

Just made a movie there is a little bit of play when I feel the clunk. Do you guys think this could be the problem?

New video by rbmm

photos.app.goo.gl