What causes the Great Wall Wingle 5 diesel version to emit black smoke?

[KadenLynn]

Great Wall Wingle 5 diesel version causes: 1. Overly rich air-fuel mixture: Need to check if the oxygen sensor is faulty. If the oxygen sensor fails, the vehicle loses its ability to automatically adjust fuel injection volume, making it prone to black smoke when accelerating hard. Corresponding parts need maintenance or replacement, including air filter, fuel injector, valve seals, cylinder liner and piston fit, oxygen sensor, etc. 2. Excessive fuel impurities: If low-quality fuel is used, gasoline will produce many impurities after combustion. Always refuel at reputable gas stations. 3. Decreased or failed spark plug performance: Spark plugs are components that ignite the combustible mixture. If spark plugs age, they cannot effectively ignite gasoline, resulting in incomplete combustion. In this case, the only solution is to replace the spark plugs.