What Causes a Car to Emit Black Smoke?

[AnnaLee]

The reasons for a car emitting black smoke are as follows: Carbon buildup in fuel injectors: Carbon buildup in fuel injectors can lead to insufficient car power, unstable idling, difficulty starting, and increased fuel consumption. Carbon deposits can be removed by using a fuel system cleaner. Carbon buildup in the throttle body: Carbon buildup in the throttle body is a major factor affecting its operation. Not cleaning the throttle body for a long time can cause errors in the throttle opening and allow air with impurities to enter the engine cylinders, resulting in poor combustion and black smoke. Dirty air filter: A dirty air filter can cause insufficient air intake, which can directly lead to a dirty throttle body and carbon buildup.