SL55/63/65/R230 AMG: Vibration around 600-650 rpm. Not engine mounts!
Thread Starter
Junior Member
Joined: Oct 2017
Posts: 16
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2003 SL55 AMG
Vibration around 600-650 rpm. Not engine mounts!
Hi all- I have an 03 SL55 that I have brought back from the deferred-maintenance grave which its previous owner dug. I have fixed everything except one annoying problem. When passing through the 600-650rpm range, I get a hum/buzz/vibration. It is most apparent when accelerating from a stop. It occurs in all gears, though it is most obvious when under load in D or R. The vibration is not particularly intense, but it nonetheless is unacceptable in such a vehicle.
I have replaced:
All ABC accumulators and pulsation dampers
Engine mounts
Transmission mount
Valve cover gaskets
The PO replaced the harmonic balancer, plugs and ABC pump not long before he sold the car to me. In addition, I have cleaned out the throttle body and reprogrammed it via the instructions on the W211 forum. Nothing seems to help (though the engine mounts did improve it slightly).
Any ideas?
I have replaced:
All ABC accumulators and pulsation dampers
Engine mounts
Transmission mount
Valve cover gaskets
The PO replaced the harmonic balancer, plugs and ABC pump not long before he sold the car to me. In addition, I have cleaned out the throttle body and reprogrammed it via the instructions on the W211 forum. Nothing seems to help (though the engine mounts did improve it slightly).
Any ideas?
Thread Starter
Junior Member
Joined: Oct 2017
Posts: 16
Likes: 0
2003 SL55 AMG
For anyone suffering from the same issue that finds this thread, check your ABC lines! I did the transverse control arm bushings a couple days ago, and found that there was a rubber ABC line bushing missing in the driver's side wheel well. This was causing the ABC line to touch the metal bracket and cause a persistent buzz/hum around 600-650 rpm. Replacing the rubber bushing caused the issue to disappear completely.
Last edited by gone_fission; Jan 9, 2018 at 02:32 PM.
Junior Member
Joined: May 2009
Posts: 32
Likes: 2
From: Austin, TX
Porsche, Mercedes, Cadillac
If you have checked the above mentioned items with no luck. Find out if the engine has ever been out of the car. If the flex plate is installed backwards (yes, it has happened) it will setup an annoying vibration at low RPM.
