F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Suspension | Chassis | Brakes > Adaptive suspension knocking at low speeds
proTUNING Freaks
Post Reply
 
Thread Tools Search this Thread
      04-13-2021, 09:38 AM   #1
Juice247
Private First Class
84
Rep
157
Posts

Drives: '17 BMW 440xi Gran Coupe
Join Date: Jun 2019
Location: Chicago

iTrader: (0)

Adaptive suspension knocking at low speeds

I swear I'm not crazy. At super low speeds, like 5mph or so, there is a very slight knocking sound from the suspension. You can hear it from time to time at higher speeds, but it's really hard to focus on. I can't get my dealer to hear it or understand what it could be, but I don't hear this particular sound on any of my other cars. Does anyone know what could cause this, so I can point my mechanic in the right direction?? Is there a point that commonly fails on the adaptive suspension?
__________________
'17 440xi GC THP, MPPSK, AA Catted DP, Dinan CF CAI, TU HPFP, BM3, xHP, E-Sys
Appreciate 0
      04-13-2021, 11:32 AM   #2
FaRKle!
Colonel
United_States
2685
Rep
2,819
Posts

Drives: '17 328d Wagon, '21 M2 Comp
Join Date: Sep 2016
Location: Bay Area, CA

iTrader: (2)

Garage List
When does the knocking occur (types of surface features, front or rear, only high speed, ect.)? It's unlikely it's active suspension specific.
__________________
-328d Wagon Build Log (with helpful reference links)
-My YouTube Channel for some of the best DIYs and in depth information

Please don't PM me for suspension recommendations unless interested in paid private consultations.
Appreciate 0
      04-13-2021, 12:17 PM   #3
cfm56d7b
Major General
United_States
3418
Rep
7,611
Posts

Drives: 2017 440i Gran Coupe & 2015 X5
Join Date: Nov 2012
Location: Orange County, CA

iTrader: (2)

There are no known common M adaptive suspension weak points. The shocks are quite sturdy and have a decent life span - well beyond 50K miles.

Few questions (while acknowledging that remote diagnostics are rarely effective):

- When did the sound start?
- Is there a distinct metal-over-metal pitch or something more dull?
- As FaRKle! indicated earlier: front or rear?

Also - measure the gap between the wheel and the fender. If the gap is substantially different, this is worth investigating. The shock (more probable) or spring (less probable) could be failing.
Appreciate 1
AllaVodka302.50
      04-13-2021, 02:08 PM   #4
frchdragon
Lieutenant
frchdragon's Avatar
Canada
306
Rep
400
Posts

Drives: 13 335ix MSport
Join Date: Feb 2021
Location: ON, Canada

iTrader: (0)

Could also be any suspension part, control arm, sway bar link.
My front M adaptive suspension were leaking badly but were still handling better than the stock F30 suspension, they did make a noise that I thought was a bad ball joint, but it was the shock because the noise went away when I replaced them with Bilsteins B4.
__________________
'85 635csi M30 turbo race car (for sale)
'13 335ix Msport BM3 stage 0+ - MAD FMI - FTP CP - Bilstein B4
Appreciate 0
      04-13-2021, 11:25 PM   #5
Juice247
Private First Class
84
Rep
157
Posts

Drives: '17 BMW 440xi Gran Coupe
Join Date: Jun 2019
Location: Chicago

iTrader: (0)

I have had the car for only 2500 miles of it's 25k miles. It has had this sound for as long as I can remember, but it's really faint so I blamed it on the run flats until I changed them to go-flats and had an alignment done. Now the noise is more clear. It happens over slightly uneven pavement and can be heard best going slowly around a parking lot. It is definitely coming from the front and the sound reminds me of a poorly fitting knuckle or ball joint.

The wheel gap measures 4.875" on all but the front passenger side, where it measures 4.75". This is from the top of the rim to the to of the fender arch on an X-drive car with factory adaptive suspension and springs.
Appreciate 0
      04-14-2021, 03:51 AM   #6
Skyhigh
Colonel
Skyhigh's Avatar
1031
Rep
2,425
Posts

Drives: BMW F36
Join Date: Apr 2018
Location: Europe

iTrader: (0)

Unrelated, but could you please measure your distance(s) from the centre of the wheel vertically to the arch? Just want to compare...

On-topic: I have the same suspension and have bought the car new. Already at the beginning I heard a knock a few times when going over speed bumps. Not every time and obviously very dependent on the speed (I never go too fast over them). It was a single knock coming from the front, like metal hitting metal. I have not heard it for quite some time now....
__________________
"Large increases in cost with questionable increases in performance can be tolerated only in cars and women."
Appreciate 0
      04-15-2021, 12:41 AM   #7
rooosh798
Private
rooosh798's Avatar
United_States
23
Rep
64
Posts

Drives: 2017 340i
Join Date: May 2020
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by Juice247 View Post
I swear I'm not crazy. At super low speeds, like 5mph or so, there is a very slight knocking sound from the suspension. You can hear it from time to time at higher speeds, but it's really hard to focus on. I can't get my dealer to hear it or understand what it could be, but I don't hear this particular sound on any of my other cars. Does anyone know what could cause this, so I can point my mechanic in the right direction?? Is there a point that commonly fails on the adaptive suspension?
Does it sound like something is loose? had a similar situation to you recently where low speed bumps would make slight knocking noises. Sounded almost like something was loose in the front suspension and made a very faint sound. My SA at the dealer diagnosed it to be a faulty front strut which was replaced under warranty and solved the issue. Happened on both sides so now I have new 2 new front adaptive suspension struts installed at 35k miles. Try to drive around in sport mode to see if it makes the sound louder. In my case, the stiffer damper settings of sport mode made the noise distinctly audible.
__________________
_______________
340i Mineral Grey - M Sport package - Adaptive M Suspension

Last edited by rooosh798; 04-15-2021 at 12:47 AM..
Appreciate 0
      04-15-2021, 01:07 AM   #8
franky818
Private First Class
180
Rep
174
Posts

Drives: e90 2010 , g20 2020
Join Date: Dec 2020
Location: SFV

iTrader: (0)

I have the same problem with H&r springs on though ... thinking it's that
Appreciate 0
      04-15-2021, 02:14 PM   #9
rooosh798
Private
rooosh798's Avatar
United_States
23
Rep
64
Posts

Drives: 2017 340i
Join Date: May 2020
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by franky818 View Post
I have the same problem with H&r springs on though ... thinking it's that
There's a bunch of threads on here about aftermarket springs not playing nice with the stock strut top mounts. Maybe that could be your issue.
__________________
_______________
340i Mineral Grey - M Sport package - Adaptive M Suspension
Appreciate 0
      04-17-2021, 04:53 PM   #10
Stucks
Lieutenant Colonel
Stucks's Avatar
United_States
149
Rep
1,899
Posts

Drives: 2017 F30 340i Xdrive
Join Date: Oct 2010
Location: Montgomery County, MD

iTrader: (12)

I have the same thing with my 17 340i xdrive with adaptive suspension. faint knocking sound at low speeds. had a driver side front strut replaced and the issue was still present. also replaced leaking thrust arms, still present. right side front strut is next thing on the list, as it is leaking a little bit but not sure if its enough to cause the noise. the springs have been stock.
__________________
Current: 2017 F30 340i xdrive
Previous: 2008 e92 335i coupe: RB turbos, mach 116 race fuel, methanol, alot of boost.
Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold)
Appreciate 0
      04-18-2021, 01:51 PM   #11
Uni-Rapide
Private
Uni-Rapide's Avatar
Netherlands
38
Rep
70
Posts

Drives: 2019 F30 340i
Join Date: Jul 2017
Location: Netherlands

iTrader: (0)

Quote:
Originally Posted by Juice247 View Post
I swear I'm not crazy. At super low speeds, like 5mph or so, there is a very slight knocking sound from the suspension. You can hear it from time to time at higher speeds, but it's really hard to focus on. I can't get my dealer to hear it or understand what it could be, but I don't hear this particular sound on any of my other cars. Does anyone know what could cause this, so I can point my mechanic in the right direction?? Is there a point that commonly fails on the adaptive suspension?
How old is your car?
I've heard that early F-series with adaptive suspension had noise/sound issues.
My 340i (10-2018 production) with adaptive suspension is fine, no strange sounds from the suspension
__________________
Mods: 19" HRE FF15, M Performance diffuser, Bilstein B16 Damptronic, VRSF catted downpipe, Remus catback, Dorch St1, Pure 800
Appreciate 0
      04-19-2021, 12:22 PM   #12
Juice247
Private First Class
84
Rep
157
Posts

Drives: '17 BMW 440xi Gran Coupe
Join Date: Jun 2019
Location: Chicago

iTrader: (0)

Quote:
Originally Posted by Uni-Rapide View Post
How old is your car?
I've heard that early F-series with adaptive suspension had noise/sound issues.
My 340i (10-2018 production) with adaptive suspension is fine, no strange sounds from the suspension
Mine is MY17, 10/16 production, so it's an early LCI. I have an appointment with an Indy in my area to take a drive and a look on Wed so I'll report back!
__________________
'17 440xi GC THP, MPPSK, AA Catted DP, Dinan CF CAI, TU HPFP, BM3, xHP, E-Sys
Appreciate 0
      04-29-2021, 12:17 PM   #13
Juice247
Private First Class
84
Rep
157
Posts

Drives: '17 BMW 440xi Gran Coupe
Join Date: Jun 2019
Location: Chicago

iTrader: (0)

So I now have had 3 shops look at this, along with an alignment, and there is nothing wrong. The slight knocking sound is just that this suspension/tire combo is noisier than the stock non-adaptive setup. Crisis averted.
Appreciate 1
      05-07-2021, 02:32 PM   #14
BurtMacklin
New Member
6
Rep
27
Posts

Drives: 2014 435i Xdrive
Join Date: Jul 2015
Location: Oregon

iTrader: (1)

I had a knocking from the front left at low speeds over almost any type of road surface. Mileage is 69xxx.

I started with-
replacing the steering box bushing- no change
torsion arm- it was leaking/bad but no change
lower control arm and upper strut mount- no change despite the strut mount being utterly shot
strut- this was the culprit. I bought a pair of Bilstein B4 dampers so that I could save a few bucks over oem and I wasn't ready to commit more money for the b6. I'm so much happier driving it as it's been noisy since I bought it used in Feb of this year.
Appreciate 0
      05-07-2021, 10:56 PM   #15
Shred Sled
Private First Class
55
Rep
115
Posts

Drives: 2016 BMW 328ixDrive Touring
Join Date: May 2013
Location: United States

iTrader: (2)

I have a gravel driveway and hear the knocking sound everyday. Seems to be more prevalent in colder temperatures. The sound was there with my 2016 F31 328ix with adaptive and stock springs. Now running Eibach springs and the sound is still there. Dealership could not hear/replicate the sound. I thought I'd seen a thread some time ago with an SIB software fix for the adaptive struts. To me the sound is like shaking dice in cup with your hand over the open end.
__________________
Appreciate 0
      05-08-2021, 05:39 AM   #16
Watsey
Major General
United Kingdom
4028
Rep
6,976
Posts

Drives: F31 330D sDrive M Sport
Join Date: Jun 2015
Location: On sabbatical.

iTrader: (1)

Sorry to contradict some of the replies that state that there's no known problems with the adaptive dampers, but...

To the contrary, there was/is a problem with these units, depending on the age of the car. The adaptive damper valves are known for their opening/closing to not be optimised with the inputs that they are trying to control, which results in a knocking/clunking noise. It's typically heard at low speeds, say up to 20mph.

There is a PUMA case on BMW's systems which (from memory) resulted in a QE (Quality Enhancement) which includes a software update to change the operation of the damper valves.

I had this update applied to my car and it cured the problem. Ironically this only happened after BMW replaced both front adaptive dampers because it couldn't sure the knocking noise.

Of course that's not to say that all knocking noises originate from the adaptive dampers, but it's certainly worth investigating.
__________________
Current : F31 330sD, DMS remap, XHPflashtune, Ohlins Road & Track, Millway Motorsports top mounts, SuperPro poly bushes, Quaife LSD, Stoptech Trophy front BBK / MSport rear discs and calipers, Pagid RSL1 pads all round, Eibach ARBs, Michelin P4S.
Appreciate 1
cfm56d7b3418.00
      05-08-2021, 11:14 AM   #17
cfm56d7b
Major General
United_States
3418
Rep
7,611
Posts

Drives: 2017 440i Gran Coupe & 2015 X5
Join Date: Nov 2012
Location: Orange County, CA

iTrader: (2)

Quote:
Originally Posted by Watsey View Post
Sorry to contradict some of the replies that state that there's no known problems with the adaptive dampers, but...

To the contrary, there was/is a problem with these units, depending on the age of the car. The adaptive damper valves are known for their opening/closing to not be optimised with the inputs that they are trying to control, which results in a knocking/clunking noise. It's typically heard at low speeds, say up to 20mph.

There is a PUMA case on BMW's systems which (from memory) resulted in a QE (Quality Enhancement) which includes a software update to change the operation of the damper valves.

I had this update applied to my car and it cured the problem. Ironically this only happened after BMW replaced both front adaptive dampers because it couldn't sure the knocking noise.

Of course that's not to say that all knocking noises originate from the adaptive dampers, but it's certainly worth investigating.
Very helpful. By any chance, is the PUMA case number available?
Appreciate 0
      05-08-2021, 02:36 PM   #18
Watsey
Major General
United Kingdom
4028
Rep
6,976
Posts

Drives: F31 330D sDrive M Sport
Join Date: Jun 2015
Location: On sabbatical.

iTrader: (1)

Quote:
Originally Posted by cfm56d7b View Post
Very helpful. By any chance, is the PUMA case number available?
I checked my emails and I did ask (2016) the service manager (at the BMW supplying dealership that I used to take my car to) for the PUMA reference/number but he replied to say that he wasn't permitted to disclose it.

His reply does at least confirm that a PUMA case does/did exist on BMW's systems for this issue.
__________________
Current : F31 330sD, DMS remap, XHPflashtune, Ohlins Road & Track, Millway Motorsports top mounts, SuperPro poly bushes, Quaife LSD, Stoptech Trophy front BBK / MSport rear discs and calipers, Pagid RSL1 pads all round, Eibach ARBs, Michelin P4S.
Appreciate 1
cfm56d7b3418.00
      05-08-2021, 05:21 PM   #19
cfm56d7b
Major General
United_States
3418
Rep
7,611
Posts

Drives: 2017 440i Gran Coupe & 2015 X5
Join Date: Nov 2012
Location: Orange County, CA

iTrader: (2)

Quote:
Originally Posted by Watsey View Post
I checked my emails and I did ask (2016) the service manager (at the BMW supplying dealership that I used to take my car to) for the PUMA reference/number but he replied to say that he wasn't permitted to disclose it.

His reply does at least confirm that a PUMA case does/did exist on BMW's systems for this issue.
Thanks for checking - always appreciated.
Appreciate 0
      05-09-2021, 12:19 AM   #20
M140_BCS
First Lieutenant
M140_BCS's Avatar
158
Rep
309
Posts

Drives: 440i Gran Coupe
Join Date: Dec 2019
Location: UK

iTrader: (0)

Puma GB 62569674-04
Attached Images
 
__________________
2016 440i F36 RWD - Quaife LSD - MHD Stage 2 HPFP - xHP - 200 Cell DP - MP Silencer - B6 Damptronics - Eibach Pros - BBS CH-R - MPS4S - AFE Drop In
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 09:10 AM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST