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.
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.
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