What Causes a Truck to Emit Black Smoke?

[DanielDella]

The reasons for a truck emitting black smoke are: 1. Use of low-quality fuel; 2. Clogged air filter, leading to an overly rich air-fuel mixture and insufficient oxygen supply to the engine, resulting in incomplete combustion; 3. Spark plug leakage, weak high voltage, or weak spark; 4. Poor driving habits when starting, insufficient cylinder pressure, or excessively low engine temperature. The solutions for a truck emitting black smoke are: 1. Repair or replace relevant components, such as the air filter, fuel injector, valve seals, cylinder liner and piston assembly, and oxygen sensor; 2. Clean relevant components to prevent clogging, such as the air filter and fuel injector; 3. Change driving habits.