It is necessary to clean the interior of the engine.
1. After using a car for a year or driving 30000 to 50000 kilometers (this time is closely related to the model and driver, please judge according to your actual situation), you will have a feeling that the power of the engine is not as strong as that of the new car, fuel consumption also increases, engine noise increases, and exhaust emissions are also significantly different from the new car. In this case, it is necessary to clean the engine.
2. After entering the combustion chamber and burning together with gasoline, fuel will form hard carbon deposits in the intake valve, piston top, piston ring groove, combustion chamber, spark plug, and other areas. At the same time, when the engine is working, the fuel and lubricating oil entering the combustion chamber will not be completely burned. The unburned fuel will also form resin through high temperature and oxidation, which adheres to the surface of the parts, and then forms carbon deposits through high temperature action.

Precautions for car engine maintenance
1. Clean the air filter
The air filter is directly related to the intake problem of the engine during the driving process of a car. The manager of the Guangben dealership told reporters that the vehicle is only driving in cities, and the air filter will not be blocked yet. However, if the car is driving on dusty roads, special attention needs to be paid to the cleanliness of the air filter.
If the air filter becomes clogged or accumulates too much dust, it will cause the engine to intake poorly, and a large amount of dust will enter the cylinder, accelerating the speed of carbon accumulation in the cylinder, causing poor ignition of the engine, insufficient power, and naturally increasing the fuel consumption of the vehicle. If driving on normal urban roads, the air filter should be inspected when driving 5000 kilometers. If there is too much dust on the filter, compressed air can be considered to blow out the dust from the inside of the filter element. But the pressure of compressed air should not be too high to prevent damage to the filter paper. He told reporters that when cleaning the air filter, water or oil must not be used to prevent oil from contaminating the filter element.

2. Removing throttle sludge
The reasons for the formation of oil sludge at the throttle valve are multifaceted, some of which are the formation of carbon deposits in the exhaust gas from fuel combustion at the throttle valve; Furthermore, impurities that have not been filtered by the air filter remain and form at the throttle. Excessive oil sludge can cause air resistance in the intake air, leading to an increase in fuel consumption.