i do have an CLS 55 amg and after the car have been unused for an 2 days or something like that its make an sound like beeb beeeb beeb from the rear left in the trunk and then its gone ? 3-4 four times every time ?

Some on who know about it ?

And something more iam wondering about.

When cold start its like it missfire a little or something like that.

No codes at all ? i have heard its normal ?

When the engine is hot its going up and down in slowly mayby 50 rpm ?

Normal ?

 

Any chance you can record an audio clip of the sound?

Possibly the DVD drive for your navigation? It could be the laser motor seeking on the disc, especially if the laser is out of spec or dying. Can't think of much else from that side of the trunk that would make noise.

 

i have solved the problem with the idle, i changed all 16 plugs and two cabels and now its going lika a dream.