DBurbach

Hey guys, weird problem, my 2005 E320 CDI emits a buzzing sound at exactly 1350 rpm under very light acceleration or going up a slight incline. Noise goes away immediately at either higher or lower revs or with heavier throttle input or at no throttle. I'm stumped, but here are a few possibilities:

1. Something in the trans
2. Driveshaft center support bearing
3. engine or trans mounts
4. A bearing on one of the belt driven accessories (I don't think this is it because if I rev it in park or neutral there is no noise).
5. Just some weird harmonic quirk of this car
6. ???

Any thoughts or ideas?

mtrevelino

Read this for some information:
https://www.benzworld.org/forums/w21...ng-1200-a.html
Mike T.

DBurbach

Thanks, looks very similar to the issue I'm having. I appreciate it!