W221 knocking sound at low speeds

Jul 16, 2013 | 05:11 PM

aigarssilins

Thread Starter

Newbie

Joined: Oct 2012

Posts: 10

Likes: 1

Mercedes Benz S320 w221

W221 knocking sound at low speeds

Hello I have w221 diesel with airmatic. The problem is that my car makes not very loud not rhytmical knocking sounds ONLY at low speeds (until 50 km/h). This sound also appears when I sharply turn my steering wheel with 3 inch amplitude. This sound also appears when outside the car pushing down the front fender. Almost forgot - this sound comes from front left side when car is quite enough warm.

Did you have such problems. Please advice. Thanks in advance.

Jul 17, 2013 | 01:08 AM

malahhaor

MBWorld Fanatic!

Joined: May 2003

Posts: 1,100

Likes: 4

From: ChiTown

06 Carrera4

wheel bering might be bad if the sound is constant while on smooth roads. if sound appears when bumpy, then it could be control arm. Take it to mechanic, lift the car, check suspension.

Jul 17, 2013 | 06:42 AM

marthyh

Super Member

Joined: Apr 2012

Posts: 616

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From: Planet Earth

S500

Yeah could be the suspension bushings ,quite common on the W221 for what I have read so far.

Jul 17, 2013 | 03:26 PM

aigarssilins

Thread Starter

Newbie

Joined: Oct 2012

Posts: 10

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Mercedes Benz S320 w221

Hi please describe wht do you mean by suspension bushings? Did you have such issue?

Jul 18, 2013 | 04:17 AM

marthyh

Super Member

Joined: Apr 2012

Posts: 616

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From: Planet Earth

S500

The bushings are the mounts onto where the suspension arms are mounted and the arms swivel around these points.
Bushings are usually made of a sort of rubber or similar nylon material that over time degrades because of this movement/load and the weather/temperature.

Last edited by marthyh; Jul 18, 2013 at 05:26 PM.

Oct 21, 2013 | 02:44 PM

tgeorgiev951

Newbie

Joined: Oct 2013

Posts: 1

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w221 Mercedes S320 cdi

front right knocking

hello!!
did you solve the problem??
it seem that i have the same issue and i have allready changed the stabiliser bar,bushing,and the knocking doesent go away.
b.r

Oct 22, 2013 | 04:03 AM

jwxspoon

Junior Member

Joined: Aug 2011

Posts: 48

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From: Myrtle Beach, SC

08 S-550, 03 BMW Z4, 02 Jeep Wrangler

Early in with my 2008 I had a line, I want to say it was a brake line, slapping against the bottom of the car periodically. My tire people found it and fixed the issue.