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      08-19-2018, 04:56 PM   #1
adpack82
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Scotland
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Drives: F30 330D M sport
Join Date: Aug 2018
Location: Fife

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Suspension noise - crunch type sound.

Can anyone shed some light on an issue I'm having?

Picked up my 'approved used' 2014 f30 330d, last month. It has 22000 miles on the clock and Its been back in to the dealer twice already, for the same issue.

The car was making a knocking sound over bumps, and a crunching noise, similar to the sound of scraping the undertray off the ground (its definitely not this), crossed with standing on a Coke can. The crunch happens on certain types of undulations, usually mid corner. Sounds like it's bottoming out, but it's not.

The car has adaptive dampers, which have had their software updated. Its also had a new wheel bearing, and both top mounts replaced, as well as 2 new tyres. (so much for approved used "multi pount check by expert technicians, on every approved used BMW" BLA BLA BLA)

The knocking has now gone, and it drives like a different car, with much better turn in and feel. However, the crunching noise is still there. It's very occasional, hard to replicate, making diagnosis difficult. It sounds like it's coming from the o/s front, although I think the rear might be doing it too, but I'm not 100%. (no fault codes on dampers)

It's not the anti roll bar bushes; I've been assured of this by the master tech, and I'm inclined to agree, as I had that problem on a Saab once, years ago.

Any thoughts, as it's driving me mad?

Last edited by adpack82; 08-19-2018 at 05:03 PM..
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