Diesel cars emit black smoke and there is nothing they can do.

The reason why diesel vehicles can't emit black smoke;

1. If the piston ring and cylinder liner of the engine are damaged, the compression pressure will be insufficient and the oil will flow to the combustion chamber. At the end of the cylinder compression stroke, if the mixture concentration is too rich, there will be more carbon deposition in the combustion process, resulting in weak acceleration and black smoke from the exhaust pipe.

2. The four-stroke engine is seriously worn or damaged. If there is too much crankcase oil, it will enter the combustion chamber, making the mixture concentration too thick, resulting in the phenomenon that black smoke cannot be emitted during acceleration.

3. This will also happen if the oil of combustible mixture is not completely burned.

4. Acceleration is too fast when driving (above 2000 per hour).

5. Start the cold car.

6. Idle speed (obviously above 2500 rpm).

7. Altitude sickness (more than 4000 is common).

The black smoke emitted by diesel vehicles is mainly carbon black particles, which belongs to dust emission. Normal car conditions mainly occur when the vehicle accelerates rapidly and the idle speed increases.

Solution:

1. If the owner goes to the 4s shop or repair shop in time to find a professional to repair and replace the piston ring and cylinder liner.

2. Repair or replace the four-stroke engine, and don't add so much oil when adding it.

3. The owner needs to check and adjust the oil pump and provide lubricating oil in proportion under different throttle opening.

4. Replace the damaged parts.

5. Warm up the car before starting.

6. Replace the solenoid valve (including the turbocharger solenoid valve).

7. Replace the fuel filter.

The above reasons can be repaired in the repair shop. Million car purchase subsidy