Please help me diagnose an issue

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IFFY100

Active Member
Joined
Jun 8, 2020
Messages
311
Location
SCOTLAND
Car
Cls 350 cdi 2010 grand edition
ENGINE - 350CDI 2010 OM642

Firstly I need to know if I have an issue.

Problem:
  • At cold start the engine sounds pretty heavy, You can hear a vibration that isn't a missfire
  • The engine sounds as if it is blowing through a hole at around 2200 rpm.
  • When warmed up, I can hear a slight misfire at idle.
Questions:
  • Is the above an issue or characteristic of the engine?
  • what are all the points where an air leak could occur?
 
Definitely not a characteristic of the engine
 

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