Why is the gasoline engine emitting black smoke?

[OEmiliano]

Gasoline engine emits black smoke due to the following reasons: 1. The injector pressure is adjusted too low; 2. The injector pressure regulating spring is broken or stuck; 3. Carbon deposits on the injector needle valve and valve seat, needle valve stuck or severely worn; 4. Uneven or excessive fuel supply from the high-pressure fuel pump to each cylinder, leading to unstable speed and intermittent black smoke emission. The solutions for gasoline engine emitting black smoke are: 1. Repair or replace corresponding parts, such as air filter, injector, valve seal, cylinder liner and piston assembly, oxygen sensor; 2. Clean corresponding parts to avoid blockage, such as air filter, injector; 3. Change driving habits. If you frequently slam the accelerator, problems like car emitting black smoke will worsen and occur more often.