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ive got same with my c200k 2009 w204 dealer couldnt diagnose and said noisy egr valve and normal
Yogi bear said:C180k engine from a W203....on idol it's making some knocking noises from what sounds like deep down somewhere!
Any ideas or feedback is appreciated.
Hi
could be big-ends going, main bearings usually rumble rather than knock
I would take a 'listening stick' to it and see if you can localise the noise, it can be misleading as to where the noise is actually coming from.
If it is big-ends you would probably get some loss of oil pressure and or mpg/performance
Is it continuous at idle, hot or cold, worse uphill or anything like that?
cheers
Nothing like stating the obvious there!
I'm assuming it could be bottom end or a crank bearing
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