What are the reasons for high engine idle speed?

[LaSarah]

The reasons for high engine idle speed are: low temperature inside the cylinders and poor gasoline atomization. To meet the necessary combustion conditions, the electronic fuel injection system will require an increase in the concentration of the air-fuel mixture. As a result, the engine will raise the idle speed to increase fuel injection, thereby enhancing the concentration of the air-fuel mixture. Idle state refers to an operating condition when the engine is running without load. When the accelerator pedal is fully released while the engine is running, the engine enters idle state. During idle speed adjustment, the RPM should not fluctuate abruptly, as this can cause premature wear to the engine. An engine is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, jet engines, and electric motors.