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What are the main reasons for a gasoline engine emitting black smoke?

1 Answers

VonGage

07/29/25 3:12pm

Gasoline engine exhaust pipe emits black smoke due to reasons such as the injector pressure adjustment being too low; the injector pressure regulating spring being broken or stuck; carbon buildup on the injector needle valve and valve seat, needle valve sticking or excessive wear; uneven or excessive fuel supply from the high-pressure fuel pump to each cylinder, leading to unstable speed and intermittent black smoke emission. Solutions for gasoline engine emitting black smoke: Perform maintenance and replacement of corresponding components, such as the air filter, fuel injector, valve seals, cylinder liner and piston fit, oxygen sensor; clean corresponding components to prevent clogging, such as the air filter and fuel injector; change driving habits, as frequently slamming the accelerator will lead to frequent occurrences of issues like black smoke emission. A gasoline engine is an engine that uses gasoline as fuel to convert internal energy into kinetic energy. Due to gasoline's low viscosity and rapid evaporation, a fuel injection system can be used to inject gasoline into the cylinder. After compression reaches a certain temperature and pressure, a spark plug ignites it, causing the gas to expand and perform work. Gasoline engines are characterized by high speed, simple structure, light weight, low cost, smooth operation, and ease of maintenance. Gasoline engines are widely used in automobiles, especially in small cars.

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