Getting a knocking noise when accelerating or decelerating slowly, particularly notic

Dec 20, 2017 | 08:58 AM

Greece2018

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Newbie

Joined: Dec 2017

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2007 Mercedes ML63

Getting a knocking noise when accelerating or decelerating slowly, particularly notic

Hello,

2007 Mercedes ML63 with 70,000KM

Getting a knocking noise when accelerating or decelerating slowly, particularly noticeable when in very slow stop-start traffic < 20mph.

Thanks to advise

Dec 20, 2017 | 09:17 AM

6172crew

Member

Joined: Oct 2017

Posts: 216

Likes: 17

From: Boerne TX

E63 and GL450, ML350 bluetec

Does the knock slow down with decel? Or speed up when acceleration? Or does it keep up with the RPM of the engine? You post is very vague.

Dec 20, 2017 | 09:43 AM

Greece2018

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Newbie

Joined: Dec 2017

Posts: 2

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2007 Mercedes ML63

Quote:

Originally Posted by 6172crew

Does the knock slow down with decel? Or speed up when acceleration? Or does it keep up with the RPM of the engine? You post is very vague.

Thanks for your response.
On slow speed like in traffic when I accelerate a bit to move the car, this loud clicking sound comes from the front, & when I take my foot of the throttle it does it again. This happens only on low speed.
When the car is still cold this doesn't happen.
Apologies if my English is not so good, but if above is not clear I can upload a video.
Thank YOU

Last edited by Greece2018; Dec 20, 2017 at 10:20 AM. Reason: adding info

May 16, 2019 | 09:38 PM

Defiant81

Junior Member

Joined: May 2019

Posts: 29

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c63s

Did you ever figure out what the noise was? My '19 c63s makes a knocking sound sometimes when accelerating at a regular pace from a stop

May 17, 2019 | 01:32 PM

N_Rob

Member

Joined: Nov 2017

Posts: 198

Likes: 20

2008 BMW M5, 2004 E55 AMG (RIP)

Quote:

Originally Posted by Defiant81

Did you ever figure out what the noise was? My '19 c63s makes a knocking sound sometimes when accelerating at a regular pace from a stop

This thread really should be moved out of W211 AMG but besides that, if you have a 2019 C63 S just take it to the dealer! You must still be under full warranty unless you drove an unreal amount of miles or voided it with mods.

May 17, 2019 | 01:34 PM

Pmarino

Senior Member

Joined: Sep 2017

Posts: 499

Likes: 66

From: N.Y. L.I.

04 E55 AMG BLK/BLK(MyDD), 06 CLK 500 (wife's) 07 ML500, 2012 C300(son's)

Sounds like front suspension is making noise when it is loaded and unloaded (even though I can't hear it)....ball joints, control arms, end links,sway bar bushings, etc.....
When is the last time you did front end work? Do you have over sized rims and tires?

Aug 12, 2021 | 01:34 PM

Ocelot140

Newbie

Joined: Jul 2021

Posts: 5

Likes: 1

C63s

Quote:

Originally Posted by Defiant81

Did you ever figure out what the noise was? My '19 c63s makes a knocking sound sometimes when accelerating at a regular pace from a stop

did you? My dealer is offering me replacing the entire 9g tranny. Aparently something is wrong with the way the electric system works with double clutch generating the sound. Only have 200 miles on the car… brand new…