mitaka

Often when I re-start the vehicle (after a short stop at the store etc) I hear very clearly a flapping, rattling noise on start up that goes way quickly within 2, 3 sec max. The noise never happens on cold start. I had a loaner recenty a C 300 and that car was doing the same thing as my R350. Does anyone know exactly the problem. Some people attribute it to purge valve, the oil, or taming chain. Any specifics?

Jae Duk

All mercedes engine are like that. Don't worry too much about it. If you are really concerned you can take it to the dealer and they can try to turn down the "clicking" sound but not completely turn it off.

akbro93704

Not sure what it is. But my C300, my friends C350, and my parents ML350 and E350 all do it....

Glyn M Ruck

Frequently timing chain slap before the oil pressure comes up & the hydraulic tensioners shut it up. It should not happen but it does.

The only thing to watch for are the Cats - if they start rattling because of broken honeycomb. Stay away from speed bumps & pot holes. The biggest killer of Cats when the catalyst is incandescent.

mitaka

Thanks that's very helpful.