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Buzzing Noise at 1350 rpm

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E-Class (W211) 2003-2009

Buzzing Noise at 1350 rpm

 
Old 05-09-2019, 09:52 AM
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E320 CDI
Buzzing Noise at 1350 rpm

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?
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Old 05-09-2019, 03:10 PM
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2006 E320 CDI
Read this for some information:
https://www.benzworld.org/forums/w21...ng-1200-a.html
Mike T.
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Old 05-09-2019, 03:48 PM
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Thanks, looks very similar to the issue I'm having. I appreciate it!
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