While in Park I can feel the vehicle shake a bit even the Air/heat unit is off. Once in awhile it does this. I took it to MB and said there is nothing wrong with it and I took it to another MB said there were nothing wrong with it. I had service B done like 3-4 weeks ago and I hardly drive the vehicle because I wan't to keep the miles down but it's parked indoor garage. The motor soundsa bit high while idelingbut both MB said it's normal and suppose to sound that way.

Should I be worried about it?

 

mine does the same. And they told me there is no problem with the engine. Just carbon build up..

 

Same here, I took it to the dealer after the second day i got it off the show room. They told me that the noise is normal, and for 4 years now, its still the same and no problems as of yet. (Knock on wood)

 

you may have a problem with an ignition coil-mercedes on the 113 v8 engine run a dual plug per cylinder set up which is two spark plugs per one cylinder-theres a circuit A and circuit B-you can actuate these circuits and turn them off using the sds that obviously the dealer has-if you turn one circuit off and its the bad circuit the car will run fine-if you turn off the good circuit so the bad one is still on the car will definately run alot worse and in most cases during the diagnosis the CEL will illuminate and then it will tell you what cylinder is misfiring-misfires will see th cel but there is a certain threshold that has to be achieved for the ECM to read the misfires and turn on a check engine light

 

My Mercedes is sitting atanother dealership (drop it off yesterday mrng). Getting ready to pick it up in a few hours and then going back in on Monday due to passanger side seat controle module on the door malfunction. That they have to order the part.

They finallyfound out the problem with the shaking in park. The motor is mis-firing. So they replace all sparkplugs and cables. It was under Factory Warrenty. Will see once I pick up the vehicle. The funny is I did not get any CEL light or anything.

 

I just had it fixed last friday. It was mis-firing they replace all sparkplugs and cables.

Thanks