e320 cdi smoking

Car is under warranty... so bring it to dealer or ask the dealer about it. This car is too new for any of us to diagnose.

You can see lots of driven taxis around here which makes the same "puffs" when accelerating. You've been driving on the highway lately? If not, give it shot. Might be some build-up in the engine...

Of course, I'm not a diesel expert so...

Smoke is unburned fuel; diesels are pretty clean when they run at a constant speed but will smoke when dramatically accelerated simply because of the sudden influx of additional fuel vs. the engine's original speed. This is thermal dynamics; accelerate more moderately and there will be less smoke. It's just the nature of a diesel.

Your car probably doesn't have a soot filter or particulate trap as do the newest ones. A particulate trap catches the soot (that you now see) and holds it for later combustion when the car runs at high speed and the exhaust is hot.

There should be no smoke from the new CDI engines. The direct injection system pretty much eliminates uncombusted fuel. I've romped and stomped on several of these engines warm and cold and have never been able to produce any smoke like the older models.

Thats what I thought too. I wonder where the original poster gets his fuel?

it may be possible, that one or more of those injectors are leaky. normally you have to pull them out, clean them and the injectorholes, replace the brass rings and set them back in their position using a special lotion.

this procedure should be done every 50.000 km at a series 1 cdi. if you wait too long, the diesel and oil is glueing the injectors so much, that there is no other way to destroy the injektor to pull them out.