Is it normal for the car to have high RPM when just started?

[SanSpencer]

It is normal for the car to have high RPM when just started. The car needs high RPM to allow the engine to quickly reach normal operating conditions, requiring a richer air-fuel mixture. Therefore, both the intake air volume and fuel injection volume will increase, leading to higher RPM. After the engine runs for a while, the RPM will drop to normal levels. The car's ECU adjusts the fuel injection volume based on signals from the coolant temperature sensor to meet the engine's varying fuel demands under different operating conditions. The colder the weather, the lower the coolant temperature, meaning the greater the temperature difference from normal engine operating conditions. The computer will control a higher idle speed when the engine is cold, resulting in higher RPM when the engine is first started.