Ugh. This JUST started happening on my roommate's 1991 W126 350SDL after I replaced the combination switch, but all I did was remove the steering wheel and the plastic on the steering column. When those parts went back on, they went back on the way they came off.

But when the engine is idling, the steering wheel vibrates and makes a buzzing noise if it's not being held. I'm sure the engine mounts are shot, etc., but it's odd that it started happening right after I replaced the combination switch.

I did also clean the old grease off of the steering column and put new grease on it, as well as slightly loosened the play in the steering box because it's difficult to turn the steering wheel at low speeds, even after rebuilding the power steering pump. Did you do any of these things right before the sound started happening?

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles