AaronC

I have this vibration that I can starting at 45MPH through 75MPH. It seems to be the most pronounced at around 60MPH. I can feel both through the seat, and by touching the console. The odd thing is that I cannot feel it through the steering wheel.

I can also hear it, with the frequency of the vibration being a pulse about every .75-1 second, depending on speed. The sound is very bass in tone.

It makes the same vibration 4th 5th and Neutral, and the "pulsing" frequency never changes based on the gear.

I had the local shop manager ride with me, and he told me he had never heard a vibration like it. He is going to get the Mercedes Factory Rep, or whatever to look at it. I am not sure what that means.

Anyone else had this problem?

dsC32

Check the runout on your rear wheels. I had the same thing on an E-Class and it was a bent rear wheel. At slow speeds it was not noticable, but became very noticable above about 40mph.

AaronC

I had the vibration with the stock AMG wheels, and now I still get it with my SSRs.

dsC32

Since it is not in the steering wheel, I would have the dealer check out the rear suspension, bushings etc. The driveshaft could also cause this if there is a problem with a U-joint, or any part suspending the driveshaft. I am not sure but on some cars there is a support in the center part of the drive shaft. I am suprised that some of the techies who have a lot more knowledge than I have not responded to your question.

CHATMANR

I had the same problem a few months ago...broken motor mounts...

AaronC

Really? Did they say how it happened? What part of the mount broke?

CHATMANR

Tey ackknowledged that it is one of the weaker parts in the engine bay. Since I have about 70k miles on the odo, I'm glad I splurged on the ext. warr.; the bill came to 1250, to replace all of them...on 2 had broken. They replaced them all because it was the smart thing to do [no repeat repairs].