What Causes White Smoke from Diesel Engines?

[DiPatrick]

Here are the reasons why diesel engines emit white smoke: Principle: Diesel fuel contains moisture, and when the engine is too cold, the fuel entering the cylinders does not burn completely, leading to the formation of mist droplets or water vapor, which appears as white smoke. Rainy Season: This phenomenon can also be observed when starting the car for the first time during winter or the rainy season. Diesel Engine: If a diesel engine emits white smoke upon startup and the smoke turns black as the temperature rises, it indicates insufficient cylinder pressure. Although this pressure is enough to start the engine, the low temperature causes some diesel fuel to evaporate and be expelled as vapor without burning. Solution: Check the tightness of the valves, the timing of the valve train, whether the cylinder head gasket or the sealing gasket of the fuel injection seat is leaking, whether the cylinder wear is excessive, and whether the piston rings are stuck or if their openings are aligned. Then, address the issue accordingly.