What are the reasons for a diesel engine emitting black smoke and lacking power?

[LeMiranda]

Diesel engine emitting black smoke and lacking power may be due to insufficient air intake or excessive fuel injection. When this occurs, the vehicle owner needs to conduct an inspection. The working principle of a diesel engine is somewhat different from that of a gasoline engine. In a gasoline engine, after the compression stroke, the spark plug is required to ignite the combustible mixture, which then enables the engine to perform work. A diesel engine does not require a spark plug to ignite the combustible mixture. Diesel engines do not have spark plugs; instead, they rely on the high temperature and pressure at the end of the compression stroke to ignite the combustible mixture. This ignition method can be referred to as compression ignition. Diesel engines generally operate at low speeds and have relatively low power, but they produce high torque. Therefore, large cargo transport vehicles typically use diesel engines.