What is the reason for the high idle speed of Nissan Qi Jun?

What is the reason for the high idle speed of Nissan Qi Jun? What is the reason for the high idle speed of Nissan Qi Jun? The reason for the high idle speed of Nissan Qi Jun is that the idle speed switch is not turned off; The speed signal determines the injection quantity and injection time. At this time, the engine is working at idle speed, and the low intake air leads to the enrichment of the mixture and the increase of the speed. Idle speed control valve failure: When the idle speed is higher than the set speed, ECU instructs the idle speed control valve to close the air intake bypass, thus reducing the air intake and engine speed. If the idle speed control valve is stuck or the throttle valve is not closed correctly due to oil pollution and carbon deposition, ECU will not be able to adjust the idle speed of the engine correctly, resulting in unstable idle speed. Air leakage in intake pipe: the opening of idle control valve strictly follows a certain functional relationship with the air intake, that is, when the opening of idle control valve increases, the air intake increases accordingly. Air leakage in the intake pipe makes the intake volume and the opening of the idle speed control valve not strictly follow the original functional relationship. The air flow sensor can't measure the real air intake, which leads to the inaccurate control of the air intake by ECU and the unstable idle speed of the engine. There are many reasons for the high idle speed of the car, but we should know that the ignition, intake and nozzle of the engine determine the combustion of fuel and are also the power source of the engine. If the idle speed is high, then we should focus on the ignition, air intake and nozzle of the engine. The common reasons for the high idle speed of automobiles include the stuck throttle and lax closing, the failure of idle speed control valve, the failure of water temperature sensor, air leakage in the air intake system, and the failure of air conditioning switch and power steering gear pressure switch. @20 19