What is the cause of engine smoke?

1, milky white oil mist is discharged from the exhaust pipe. The main reason is the poor vaporization of fuel, which is discharged from the exhaust pipe without combustion, resulting in milky white smoke. It is common to start the engine in winter, which is caused by low temperature and poor fuel atomization. Generally, after the engine is started, it disappears with the increase of engine temperature.

2. The exhaust pipe emits a lot of water vapor and white smoke, and there are water droplets at the exhaust pipe mouth. The main reason is the water vapor formed when cooling water rushes into cylinders or gasoline. Solution: 1 When the engine is running, the exhaust pipe emits a lot of water vapor and white smoke. Check whether there is water in the oil tank, whether the cylinder gasket is damaged, whether the cylinder block is cracked and whether the cylinder liner sealing ring is intact. 2. When a car parked in winter or rainy season starts for the first time, you can often see white smoke. Never mind, once the engine temperature rises, the white smoke will disappear, and this situation does not need maintenance. If the exhaust pipe turns black smoke after the engine temperature rises, it means that the cylinder pressure is too low or some cylinders are not working, so it should be checked and eliminated. 3. Cylinder liner and piston, main bearing bushing, connecting rod bushing and crankshaft journal are moving friction pairs. Due to the lack of engine oil and high surface temperature of the moving pair, the surface of the moving pair is scratched by brush (cylinder pulling, cylinder pulling), resulting in white smoke.

Extended data:

The maintenance of automobile engine needs regular maintenance. When driving through some particularly wet or dusty areas, check and maintain the relevant parts of the engine: 1, and change the oil and oil filter regularly. When the oil passes through the pores of the oil filter element, solid particles and viscous substances in the oil will accumulate in the filter. If the filter is blocked and the oil cannot pass through the filter element smoothly, the filter element will burst or the safety valve will open, and the dirt will be brought back to the lubrication part through the bypass valve, which will accelerate the engine wear and aggravate the internal pollution. 2. Keep the crankcase well ventilated. Contaminants in the air will deposit around the PCV valve, which may block the valve. If the PCV valve is blocked, the polluted gas will flow into the air filter in the opposite direction, and the polluted filter element will reduce the filtering ability. If the inhaled mixed gas is too dirty, it will further pollute the crankcase, resulting in increased fuel consumption, increased engine wear and even damage to the engine.