W211 om642 exhaust smell interior

[JohnnyW202]

When idling I can smell exhaust fumes in the cabin goes away with the recirc button and when moving.

Checked the exhaust at the rear no leaks or soot deposits on the egr pipe, turbo to cat, manifold inlet pipes to turbo.

It's quite choking! Changed the charcoal cabin filter and it blocked the smell for a couple of weeks but now it's back.

Anyway to modify the air intake so it's away from the back of the engine seems a stupid design.


Sent from my iPhone using Tapatalk

 

[Daveml350]

Hi. I had the same problem with my ML, turned out to be a copper washer that one of the injectors tightens down onto. I think they call it chuffing. My mechanic fitted new washer and is now all sorted.