canyucel

I have a weird shake coming from the rear of my 2002 automatic Mercedes Benz CL500, with 200,000km.

This only occurs when accelerating from a stop, and causes the car to shake violently until i hit about 20km/h, after which, the car operates as normal. Here are some clues I've gathered.

-occurs only when accelerating from a stop (longer and more pronounced when accelerating slowly)

-no noise is heard past 20-30km/h

-no noise is heard if you allow the car to move forward without stepping on the gas

-occurs regardless of what gear you accelerate from stop with (1st, 2nd, 3rd, can be selected through shift knob despite being an automatic)

-occurs during turning as well

-causes the car to shake, and not accelerate as normal

-traction light comes on during the rumble

-a pump can be heard from the engine bay

I've taken it to a mechanic, who said it was the wheel bearings, but I wasn't convinced, as there is no noise at high speed, and very little play in the wheel.

Thanks for any reply

ItalianJoe1

I was thinking torque converter until I got to the end... Traction light and pump from the engine bay means it's the car fighting acceleration with the brakes via ASR/Traction control.

You probably do have a wheel bearing or speed sensor fault, causing an erratic signal and attempted intervention that doesn't work, until maybe it hits a speed where it won't try anymore, not really sure why it stops at a point.

I'd suggest having the car scanned properly with SDS, will tell you more than me guessing at it.

canyucel

Thank you so much ItalionJoe1!!!


I was turning off the traction control (ESP) from inside, but this time, I pulled the fuses (2,34) and the problem is gone! So time to replace the speed sensors I guess