C400 Knocking noise on idle - with video!
It could be the Camshaft, look to see if you see any oil around the left side and right side.
Also, since it goes away when you revv the car, you could have a leak in the vacuums system or it could also be the idler or tensioner whereas the bearings are going.
I can’t hear it inside engine bay at all. Only inside cabin (sounds like it’s coming from the front) and inside gas cap
https://www.youtube.com/watch?v=MuZJSGN8qZ4&t=282s
the threads include:
The birth thread: https://mbworld.org/forums/e-class-w...ml#post8621276
derivatives:
https://mbworld.org/forums/mercedes-...ification.html
https://mbworld.org/forums/showthrea...9&goto=newpost


