I purchased a 2020 GLC 63 2 months ago. It has 41,000 miles on it. It makes a wierd noise when under load and at 50% boost and up. It's coming from the drivers side engine bay. It sounds like maybe some sort of boost leak. My kids say it sounds like a rattle snake. Any help would be greatly appreciated! I uploaded a video on youtube.


https://www.youtube.com/shorts/Muieixy3iKs

https://www.youtube.com/shorts/OrQmP1ZcsZY

 

How about you link the video here, so people don't have to go hunt for it? Not sure what comes up with that title is the right one.

 

Thank you! I couldn't figure out how to add the link. I think I got it now.

 

Ok, that's the one I had found and I listened to it a few times, but not sure what I'm supposed to hear. All I'm hearing is normal engine and what I think is road noise.

 

Sounds like something is loose and rattling. Can just hear it if you listen a few times. Rattle snake is a pretty good description.
I find it impossible to link anything to a thread on the forum.

 

I added another video, maybe you can hear it a little better. It's pretty loud especially when diving between buildings.

 

I appreciate your input, it's only under boost so I don't think it's anything loose. I added another video to the original post. I just can't find much info on the turbo setup. So I don't know know where to begin. I was hoping someone on the forums may have some insight.

 

might be the waste gate on the turbo, probably need a Mercedes mechanic to diagnosis it

 

Any other symptoms you notice when this is happening?

 

No, nothing other than the noise. it seems to be more frequent now though and at lower boost.

 

as mentioned above, take a peek at the waste gates when you are idling and see if they are moving at all. They should not be moving. Maybe come back and report after you do that.