What is the reason why Chevrolet can't rotate at idle speed of 900 after the hot car of Sail restarts and returns to normal?

The main fault causes are the increase of carbon deposition in throttle, air intake and valve, and some gasoline is adsorbed when the car is cold. When the car is hot, the gasoline volatilizes, which will cause the mixture to be too rich when the engine is idling, which will lead to the unstable idling of the hot car.

So you should not only check the throttle and idle motor, but also check whether there is too much carbon and dirt at the air inlet. If there are too many carbon deposits and dirt, the cross-sectional area of the air passage will change, which will make the control unit unable to accurately control the idle intake, resulting in too rich or too lean mixture, abnormal combustion and engine jitter. At the same time, you should also pay attention to check whether the carbon canister is faulty.

Other common faults are summarized as follows:

Symptoms: The engine idle speed of Sail car is controlled by the idle stepping motor installed on the throttle body. When the engine is running, there will be a lot of dirt on the throttle and idle valve of the throttle body due to the air quality. When the dirt is serious, the engine will have low idle speed, poor stability or no idle speed, and the throttle will be stuck when refueling.

Solution: Sail cars usually travel about 20 thousand kilometers, so it is recommended to clean the throttle body. After cleaning, the engine can reach the normal working state by setting a diagnostic instrument.

Symptoms: The function of the fuel injector in the electronic fuel injection system is to inject the fuel delivered by the oil pump into the front of the intake valve in time and regularly, and mix it with the fresh air in the intake pipe to form a combustible mixture.

Because gasoline contains impurities more or less, these impurities will attach to the needle valve of the injector. Working for a long time will lead to poor atomization, series discharge or leakage during fuel injection, and even lead to improper needle valve closing, frequent oil dripping or stuck fuel injection. When driving, the engine will feel weak, trembling and unstable, and the exhaust gas will exceed the standard. In severe cases, the engine will not start.

Solution: When the above faults occur, it is necessary to clean the fuel injector without disassembly. At the same time, the combustion chamber and the top of the piston can be cleaned together and discharged with the exhaust gas, thus restoring the power and fuel economy of the automobile.

Maintenance price: It is recommended that Sail cars be driven every time 15000.