Why Do Diesel Engines Emit Black Smoke?

[ValerieFitz]

Here are the specific reasons why diesel engines emit black smoke: 1. Overly rich air-fuel mixture: It is necessary to check whether the oxygen sensor has failed. If the oxygen sensor fails, the vehicle loses the ability to automatically adjust the fuel injection volume, making it easy to emit black smoke when the accelerator is deeply pressed. Corresponding parts such as the air filter, fuel injector, valve seal, cylinder liner and piston assembly, and oxygen sensor need to be repaired or replaced. 2. Excessive fuel impurities: If low-quality fuel is used, a lot of impurities will be produced after combustion. Always refuel at reputable gas stations. 3. Decreased or failed spark plug performance: The spark plug is the component that ignites the combustible mixture. If the spark plug ages, it cannot effectively ignite the gasoline, resulting in incomplete combustion. In this case, the only solution is to replace the spark plug.