C180 kompressor w204 2008 rough idle.

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johnlewis1964

Active Member
Joined
Aug 17, 2017
Messages
267
Car
2008 C180 Kompressor.
Hi folks I intermittent rough idle on my car I have had all intake pipes checked they are all OK any advice on what to try next thanks.
 
The car needs to be scanned using MB STAR diagnostic computer. If your garage doesn't have one, then see if you can get access to an iCarsoft MB 2 scanner. Otherwise take the car to a specialist that has STAR.

Also, the M271 engine is prone to timing gear failure. If the engine is running on 3 cylinders, then the timing chain may have jumped a tooth or the engine may have even bent a valve. Though in this case, it won't be just rough idle, instead it will sound rough through the rev range.
 
Rough idle is usually an air leak on the engine intake manifold. Since you say you have had the inlet gasket checked and is Ok, what about the vacuum hoses coming from it? (there is normally quite a few). Are any of them perished / Cracked / broken off?
 
Check for oil in the cam magnets electrical connection ? The two round things on the top front of the engine
 
This engine has issues , the internet (and this forum) is full of info . BUT it's not all doom and gloom , many M127's rack up big miles without issues. Do NOT rely on a full MB service history for comfort, even those have had cam chain/sprocket problems.

 

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