C220d knocking in cold
#1
C220d knocking in cold
Hello
my 2014 c220d does this knocking sound ( see attachements ) when I first start it in the morning,
knocking goes stays when I accelerate and almost disappears after half hour of driving, car runs fine though.
any ideas ?
edit: new video added
my 2014 c220d does this knocking sound ( see attachements ) when I first start it in the morning,
knocking goes stays when I accelerate and almost disappears after half hour of driving, car runs fine though.
any ideas ?
edit: new video added
Last edited by sc57rider; 03-15-2023 at 03:49 PM.
#2
Super Member
I can't hear anything. Is it coming from the inside of the car or outside of the car. Also, I only hear knocking when you move your phone.
#3
#5
MBWorld Fanatic!
I've not listened to your file, but mine (M274 2.0 gas engine) has done what you described since I bought it 5 years ago. At first I thought it may be something wrong but I'm thinking it may be normal (?). At least on mine, if it was a problem, I would think something would've happened by now. ![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
Good luck!
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
Good luck!
#6
#7
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#8
Junior Member
I assume your car has the OM651 diesel engine. It's really hard to tell from the video but I think my car has a similar noise. If the noise is coming from the passenger side in the engine bay, in the general area of the turbo and filter housing it could be the turbo bypass valve. The bypass valve is made from metal and if the spring in the part looses tension, it can develop a rattling sound.
Here is a Xentry Tips document describing the issue https://static.nhtsa.gov/odi/tsbs/20...19692-9999.pdf
And here are videos describing the issue:
Again it's hard to tell from the video, it could also be the belt tensioner or the chain/chain tensioner or many other things.
EDIT: Here is a thread from the W212 forum with a similar issue: https://mbworld.org/forums/e-class-w...old-start.html
Here is a Xentry Tips document describing the issue https://static.nhtsa.gov/odi/tsbs/20...19692-9999.pdf
And here are videos describing the issue:
Again it's hard to tell from the video, it could also be the belt tensioner or the chain/chain tensioner or many other things.
EDIT: Here is a thread from the W212 forum with a similar issue: https://mbworld.org/forums/e-class-w...old-start.html
Last edited by denis550; 03-17-2023 at 05:20 AM. Reason: added link to w212 thread