Black smoke from a car's exhaust typically indicates an overly ... Black and blue smoke are more common in diesel engines, and there's a dedicated article explaining why it occurs.

Diesel engines, typically known to be ... A clear sign of fuel-related EGT problems is black smoke coming from the exhaust. Restricted airflow, such as a clogged turbocharger or blocked exhaust ...

The practice known as “rolling coal” occurs when a diesel truck is modified so that it can intentionally blast black smoke in abundance ... that inhaling toxic exhaust fumes can put ...