Why does Toyota's twin-engine always rotate at low speed and high speed?

The speed can be adjusted. If the speed is abnormal, you can find a way to make the engine run at a normal fast idle speed when it is cold. However, it still keeps a fast idle speed after the hot car, which leads to the failure of high idle speed. The reason is that the throttle valve is stuck and closed loosely; Additional air valve fault idle control valve fault water temperature sensor fault air conditioning switch fault.

Toyota glory performance

Power steering gear pressure switch failure crankcase forced ventilation valve failure air intake system leakage generator charging voltage is too low. Excessive idle speed is mainly caused by excessive intake air or incorrect engine control signal, and the fault of temperature sensor is the cause of excessive idle speed.

Water temperature sensor failure, throttle position sensor failure, air flow meter or intake manifold absolute pressure sensor failure, switch signal failure, idle control valve failure, throttle body failure, fuel injector failure, vacuum air leakage, engine control unit failure or matching setting problem, etc.