Hello,

I have an issue with my CLK 320 (w209.365) now 6 years old and 80k miles.

I notice a vibration in the car that is comming stronger lately when ticking over, the rpm seem to go up down very slightly and even sometimes the car seems to be about to stall. I also noticed that when the vibration gets harder even the lights switch off for a milisecond.

I made a diagnostic and I have an error in the secondary air pump that it's going to be replaced soon. I don't know if there can be any relation. The vibration doesn't disappear when the engine reaches working temperature and as far as I know this pump only works at low temps.

Anyone has an idea of where that vibration can come from?

Many thanks in advance