Date registered: May 2015
Vehicle: 2005 Mercedes S500 Designo with ABC
Mentioned: 0 Post(s)
Quoted: 20 Post(s)
Inexplicable Vibrations at ~70mph
The car is in almost perfect condition.
A vibration is plaguing the driving experience. Between 60 and 75mph the vibration is most pronounced, but it rears its ugly face at other speeds as well.
Sometimes the vibration seems to (briefly) go away entirely, while other times it's really bad.
When acceleration hard above 70mph it likes to rear its head, but also when coasting or maintaining speed. It's not dependent on engine speed.
I feel it on the throttle pedal and see it on the passenger headrest.
I don't feel the vibration in the steering wheel at all.
The back tires are new contis, the front tires are older somethings.
I've had 3 balances done, and had a wheel "straightened". I've also done an alignment. I've also replaced the rear flex disk. The disease persists.
Googling yields so many forum posts describing exactly this: vibration at 70mph seen in the passenger headrest, and inevitably everyone suggests everything, and OP invariably tries everything, but rarely does something helpful come out.
WHY IS MY CAR VIBRATING?!?!?!!??!!!