Tingle/buzz in steering wheel at idle
 

I'm getting a "tingle" in the steering wheel while sitting idling in Drive or Reverse. Been doing it over a year now. Feels like a vibrator on slow speed. Can't feel it in the shifter, can't really detect it much through the armrests or dash or floor. Goes totally away if I rev it just a hair above 600, or if I shift to neutral. Did all the usual suspects - tune-up, injectors, motor mounts, little motor mount shocks, exhaust hangers, motor touching frame/etc. Did the tensioner shock. Even took the belt off and ran it a few seconds - still did it. Motor is running really smooth, compression is pretty equal on all cylinders.

It's so consistent, seems to vibrate at the frequency of the motor RPM (Buzzzzzz). So I've kinda ruled out a miss or a bad injector at that idle speed.

I'm thinking maybe something in the torque converter or tranny front pump - but just cant feel a thing thru the shifter. I did loosen and retighten the flex converter bolts.
Next suspect is harmonic balancer - seems to run straight though. And as I said, rev it from 600 to 700, or shift to neutral and it virtually goes away.

Anyone ever experience this on the 103 engine ('91 300SE)???

DG

Sounds like the beginning of motor mount failure to me.

So I thought also, but I'm on my second set since this started last year.
Even got an OEM for the passenger side.

DG, from what I have read aftermarket motor mounts can have a short life ... in terms of months, not years ... especially URO brand. Best to install genuine MB motor mounts so they last many years.

vibration
 

Try loosen whole exhaust in mounts esp at trans and retighten bolts that helps sometimes, you did do the trans mount?

Yeah, I know well the life of Uro parts, especially mounts. I did all the usual suspects; it's been going on over a year, actually replaced both mounts twice, and the tranny mount once, and replaced center muffler and all hangers and repositioned the entire exhaust a couple times.
Yesterday I put a jack under the motor and took some of the load off the mounts; no change. But, I changed the oil and the tingle actually got a lot better. I thought I was imagining it, but I drove it today and it really is almost gone - is that weird or what.

DG