Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here. I have looked through the service bulletins from Mercedes and have one that may apply. I have enclosed in in the link below. Have a look and see if this will help you determine the source of your noise.https://dl.dropboxusercontent.com/u/104923897/Engine%20Noise%20aug%2019.pdf
Unfortunately this is all I have. I will open the post back up for you and perhaps someone else may have something to offer.