What Are the Reasons for Diesel Vehicles Emitting Black Smoke?

[LeValeria]

Diesel vehicles emit black smoke for the following reasons: 1. Insufficient air supply: Remove the air filter and observe the exhaust smoke color. If the smoke color is normal, it indicates that the air filter is too dirty, causing black smoke. Replacing the air filter can solve the problem. 2. Poor diesel quality: This leads to inaccurate fuel supply from the injector, clogging, and wear, ultimately resulting in black smoke. Therefore, replacing the solenoid valve and using high-quality diesel can help. 3. Poor quality or expired fuel filter: A low-quality filter cannot effectively remove water and impurities from the diesel, so the fuel filter needs to be replaced. 4. Excessive fuel supply to the cylinder: Conduct a cylinder-by-cylinder fuel cutoff test while the engine is running. 5. Increased piston gaps in the diesel engine: In this case, the vehicle must be taken to a repair shop for servicing.