What is the reason for high idle speed?

1, throttle failure. Too dirty throttle will lead to throttle opening error, throttle sensitivity will be reduced, and it may not be closed well at idle speed, resulting in abnormal idle speed. In addition, the throttle failure will also affect the engine's power, acceleration performance and fuel consumption, and even lead to difficulties in starting in serious cases.

2. Idle speed control valve is faulty. The failure of idle valve will make the idle speed unable to be adjusted correctly, which will cause problems such as unstable idle speed and difficult cold start. In severe cases, there will even be no idle speed, and the engine will turn off as soon as the throttle is released.

3. Sensor failure. Sensor failure, computer error, or computer failure, engine idling is abnormal.

The idle speed of this car is too high and it consumes a lot of fuel. It doesn't really matter much when it starts, because it can be controlled by the throttle. The simple thing is that when you practice changing positions, you don't need the throttle, and you can start directly by releasing the clutch. At this time, the idle car is fast and the idle car is slow. So if it is too small, it is easy for people who have just learned to drive to stall.