China Naming Network - Solar terms knowledge - What is the sudden increase in vehicle idle speed?
What is the sudden increase in vehicle idle speed?
The increase of vehicle idle speed is caused by the failure of engine air intake system and fuel system. The following is the introduction: 1. The engine intake system may be caused by the damage of throttle assembly, intake flow sensor, engine intake pipe, engine vacuum pipe, engine exhaust gas recirculation valve and other components. 2. Control the air to enter the throttle assembly of the engine and a controllable valve. After the gas enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, and the combustion is successful. Simply put, it is the same nature as a person's throat. When this component fails and the throttle opening is out of control, the throttle opening will increase and the idle speed of the vehicle will suddenly increase. 3. The intake air flow sensor converts the intake air flow into an electrical signal and sends it to the electronic control unit (ECU). As one of the basic signals to determine fuel injection, it is a sensor to measure the intake flow of the engine. If this component fails, the ECU of the vehicle will not be able to accurately judge the amount of air entering the engine, so the idle speed of the vehicle will suddenly increase. The vacuum tube of the engine keeps the vacuum degree of the engine and ensures the smooth operation of the engine. If the vacuum tube is damaged, the vacuum inside the engine will be unstable. In order to ensure the normal operation of the engine, ECU will increase the engine speed to maintain it, so the idle speed of the vehicle will suddenly increase.
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