Hi Konigstiger, so I went to the dealership to get a diagnosis on the knocking sound on a cold start because in order to request a goodwill repair it needs to be diagnosed by a Mercedes-Benz dealership. So I went and explained to the service advisor that my engine is within that range of the bulletin and left the car overnight for diagnosis. Next day, service advisor explained me that this is normal for direct injection engines having high pressure and thats the way they run. I made a video of a cold start: https://vimeo.com/296284511
I have heard a knocking (?) engine sound following rpm (link is to video of the sound.) and i am a little bit worried. Cant seem to find anything about this elsewhere and no video. This seems to be a normal sound on e55 amg kompressor from a video i found, but nothing on the m278. The car runs great but i need to know what to do.
Responding to your post, to which i have copied below:
"I have heard a knocking (?) engine sound following rpm (link is to video of the sound.) and i am a little bit worried. Cant seem to find anything about this elsewhere and no video. This seems to be a normal sound on e55 amg kompressor from a video i found, but nothing on the m278. The car runs great but i need to know what to do.
Please can anyone help me and give me advice?
Tiesan, I have the same noise from my M278, it does not go away after it warms up, as such we do not believe in our case it is timing chain adjuster related. It sounds like it is a noisy hydraulic lifter. How did you go with yours, did you find out what is causing it. Your input would be greatly appreciated, Thank You Paul
Did your noise end up being the timing chain tensioners ? I have what seems to be the same noise, however it does not go away even once engine is warm. I have been told by a tech that he believes it is a hydraulic lifter, just wondering what yours was ?
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I have read both yes and no to this question that a battery charging software needs to be reset with a new battery. If yes, how is it done without a SDS tool?
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