Discussion Starter · #1 ·
I recently noticed a little bit of black smoke out of the tailpipe when accelerating forward after backing out of my driveway (the engine being cold). I have not really noticed this under any other circumstances. What are the most likely causes of this phenomenon in a 1981 240D, and what (if anything) can I do to mitigate it? I recently changed the air filter, so we can probably rule that out, as a cause. Any thoughts?