mika_silber1

Mercedes R Klasse Diesel Engine Problems

My 2005 Mercedes R Klasse diesel is giving me fits It's got 240028 km on the clock and the check engine light is on I'm losing power when accelerating it smokes when I put my foot down the engine runs rough and my fuel consumption is high There's also jerking and a loud hissing noise when I accelerate like a vacuum leak Anyone else had this misery

4 comment(s)

I had a similar issue with my R Klasse diesel Symptoms sound awfully familiar The hissing is interesting I'd definitely suspect the EGR valve as a starting point but have you considered checking for vacuum leaks in the hoses connected to the EGR system Sometimes a split hose can cause similar issues Also has the catalytic converter ever been checked A blocked catalytic converter can mimic EGR problems Does it idle rough

Thanks for the reply Vacuum leaks I hadn't really thought about that Where exactly should I be looking for these leaks And how would I check the catalytic converter without taking the whole exhaust system apart As for the rough idle yes it's definitely idling rough especially when cold

I am no expert but given the rough idle the smoke and the hissing it really does sound like the EGR valve I would go to a workshop They can properly diagnose the vacuum lines If the valve is jammed open or closed it will cause havoc As for the catalytic converter I am not sure how to check this myself

Thanks I appreciate the help Took it to a mechanic and you were spot on – EGR valve was completely shot New valve fitted total cost 355€ and the car is running like a dream again No more smoke power is back and the hissing has gone Cheers

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