Hi,

My car is an 07 Cls 550. I have this strange problem for about 10kmls now. The conditions that lead to the vibration must be the following

- Driving on the highway and the car is on it's last gear (i guess 7th). Speed is around 105km/h (62mph). RPM is at 2000rpm

Description:

When you accelerate from 62mph to 72mph (rpm 2000 to 2500), you can feel a light vibration (no noise..) on the floor. Past 72mph, no more vibration even if the car is accelerating. Acceleration must be done without the need of downshifting. When crusing, car is perfect. When on other gears, same RPM, car is perfect. When going WOT, car is perfect.

Just read the car with SDS, no codes so far...

Anyone has an idea ?

Thanks

 

When is the last time you had all four wheels balanced? Most likely the culprit.

 

Hi,

It can't be the tires... since it does not happen in 6th gear

 

It isn't tires, it is wheels. Wheels cause vibration at those speeds so you need to get them balanced. Didn't know 7th gear would be at 70mph...I have 5 gears

 

Wonder when was the last time you did tire and wheel balancing. Did you get it done at a shop with a road force balance machine. I had a similar experience on a different car with new high performance winter tires and it required road force balancing before it would settle down. Vibrations only at 65-75 mph, not above and not below.

 

Get the wheels checked for straightness before they balance them. MB wheels bend easily. I've had to have all 4 of mine straightened, one needed it a 2nd time.