Noticed today with the AC on there is a rattling/buzzing coming from the left front of the engine. Can't tell if its the compressor or anything else. The belly pan is on tight as it can be, all plastic bits were given a check and nothing.

Arthur Dalton helped me out on this and this should help anyone else

http://www.peachparts.com/shopforum/tech-help/247446-93-190-e-2-3-timing-chain-question-post2139566.html?highlight=ring+shock#post2139566

I have that same noise on my M103. I replaced the tensioner and belt shock though. Only in drive at idle. Weird.

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1991 300E - 212K and rising fast...