The idle speed of Xichai 330 engine is high in cold car and low in cold car.

Due to the correction of control unit program and sensor signal, the idle speed is high. When the temperature rises, the idle speed will gradually return to normal. High idle speed of cold car is the characteristic of EFI car. The temperature of engine coolant is mainly judged by the signal of water temperature sensor, which is rich when the cold car starts. At high idle speed, the engine can quickly reach the optimal working temperature, reduce engine wear and make the cold car start quickly.

Idle speed can be adjusted by adjusting throttle opening and idling oil supply. Generally speaking, the minimum idle speed is the best when the engine does not shake in the idle speed range and the acceleration performance is good.

According to GB 18285-2005, the idling condition refers to the no-load running state of the engine. That is, the clutch is in the engaged position and the transmission is in the neutral position (the car with automatic transmission should be in the "parking" or "P" position); In the automobile equipped with carburetor fuel supply system, the choke valve is in the full open position; The accelerator pedal is in the fully released position.