What color does the car exhaust show that the car may be out of order?

The first type: black exhaust gas, which is the most common color, is usually accompanied by engine jitter and insufficient power. There are generally two reasons. First, the engine gasoline burns excessively, and the fuel ratio in the cylinder mixture exceeds the normal level, resulting in abnormal air-fuel ratio. We can focus on checking the cleanliness of the throttle, whether the oxygen sensor is damaged, the fuel pressure regulator and other oil control system components, and adjusting the air intake and injection timing to solve the problem. Second, the air filter is blocked, which leads to insufficient air intake, insufficient fuel combustion and black smoke from the car. In this case, cleaning or replacing the air filter can solve the problem.

The second type: a lot of persistent white automobile exhaust. Although white automobile exhaust is water vapor produced in temperature difference environment after fuel is fully burned, it is a normal phenomenon. However, if a large amount of persistent white automobile exhaust shows that the cylinder head gasket may be damaged, it shows that the engine has good sealing performance and will not lose too much heat. However, if the cylinder head gasket is damaged, the heat in the engine will be continuously lost and enter the exhaust pipe, forming a continuous white exhaust in the temperature difference environment. In this case, you can check whether the engine cylinder block and seal are damaged, and solve it by replacing or repairing the engine seal.

The third type: blue tail gas, which usually appears because the engine burns engine oil, is generally accompanied by the phenomenon that the throttle is weak and the engine noise increases. First of all, you can check the oil quantity with the oil gauge. If the oil quantity is too high, it will cause the oil to enter the cylinder, and some oil can be released to reduce the oil level. Secondly, you can check the tightness of the engine cylinder and piston to see if the gap between the cylinder and piston is too large and whether the piston ring is installed backwards, so that the seal can be replaced and repaired. At the same time, if the engine oil deteriorates or the quality is not up to standard, it will also cause the car to emit blue tail gas. Try to use high-quality qualified engine oil, such as domestic Kunlun lubrication, Great Wall or imported Shell. Of course, it must be genuine. In order to avoid counterfeit goods, I either check whether Kunlun lubrication is suitable when PetroChina refuels, or choose it myself in Anton.