Why does the idle speed increase after a cold start?

[LondynRose]

It is normal for the idle speed to suddenly increase during a cold start. To help the engine quickly reach its optimal operating temperature, the idle speed is increased based on signals from sensors like the coolant temperature sensor. Here is more information about car idle speed: 1. After the engine warms up, the RPM will gradually drop to around 800 to 1000. The normal idle speed during a cold start is typically between 700 to 800 RPM. If the idle speed is too low, the engine may vibrate excessively, while a high idle speed can lead to increased fuel consumption. 2. Idle speed refers to the engine's operating condition when it is running without any load, i.e., when the car is in neutral gear. The RPM during idle is called the idle speed, which can be adjusted by modifying the throttle opening, among other methods.