White smoke, blue smoke and black smoke are emitted from the automobile exhaust pipe. What is the reason? How to deal with it correctly?

White smoke, blue smoke and black smoke are emitted from the automobile exhaust pipe. What is the reason? How to deal with it correctly?

We all know that the exhaust pipe will smoke after the car is started, but the color of the gas may be different during the smoke process. There are many reasons for this difference. Some situations are normal phenomena that do not need to be dealt with, while some problems need to be paid more attention to in the process of using cars at ordinary times. Today, let's talk about the color of smoke from the exhaust pipe of the car.

First of all, the exhaust pipe is emitting white smoke, especially in winter, which makes people mistakenly think that the cooling system is leaking. In fact, this is a very normal physical phenomenon, but also a full performance of gasoline combustion. When the engine is working, the temperature of the gas discharged from the cylinder will reach 400 to 800 degrees Celsius. At this time, the water before combustion is gaseous, which will make a lot of water adsorbed on the exhaust pipe wall with relatively low temperature. After a long time, it will drip down the exhaust pipe. When it is cold, white smoke will come out of the exhaust pipe due to the temperature difference. In fact, this is a small water droplet condensed by water vapor and discharged with the gas.

However, if there is a lot of white smoke when the temperature is high in summer, it may be that there is too much water in the gasoline, or there is something wrong with the cooling system, such as the damage of the water seal and the damage of the cylinder liner, which leads to the cooling water entering the engine cylinder. If the exhaust pipe emits black smoke, it needs special attention, mainly because the engine oil of the car has flowed into the combustion chamber and burned together in the cylinder, which is the legendary burning engine oil. This may be a problem with the piston ring or seal of the engine, especially some old cars. It is very likely that the piston ring seal has problems due to long-term wear, the oil-water separator is aging, and the gap between piston and cylinder is increasing, which leads to the oil flowing into combustion. This is also the reason why many classic cars need to replace the oil with higher viscosity, which can enhance the sealing connection of the engine and reduce oil leakage.

It is rare for the exhaust pipe to emit black smoke, which is mainly caused by the uneven mixing of oil and gas. Because most of the existing models are EFI models, the computer will control the fuel injection quantity and intake air quantity to achieve the best mixing ratio, and keep a certain balance at any time, which will not cause the imbalance of empty burning pens. However, if the air filter is dirty, the spark plug is not good, the ignition coil is faulty, and the oil is too poor, it will also lead to the imbalance of the oil pen and lead to black smoke from the exhaust pipe. Although it looks serious, this situation is relatively easy to handle, and the maintenance cost is not very high.

Generally speaking, the exhaust pipe of a car, like our breathing, can reflect the health of the car. White smoke is generally a normal phenomenon, blue smoke may be caused by engine oil combustion, and black smoke is mainly caused by uneven mixing of oil and gas.