What is the reason for the sudden increase of idle speed in Nissan Qi Jun?

What is the reason for the sudden increase of idle speed in Nissan Qi Jun? What is the reason for the sudden increase of idle speed in Nissan Qi Jun? Reasons for sudden increase of idle speed in Nissan Qi Jun: Throttle failure: Unclean throttle will lead to wrong throttle opening, reduced throttle sensitivity, and improper closing 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. Idle speed control valve failure: due to idle speed valve failure, idle speed cannot be adjusted correctly, resulting in unstable idle speed and difficult cold start. In severe cases, even if there is no idle speed, the engine will stall when the throttle is released. Sensor failure: sensor failure will make the computer misjudge, or the computer itself failure will lead to abnormal engine idle speed. When the car idles too fast, it consumes a lot of fuel, but it doesn't have much impact when it starts. @20 19