Why does the car idle high when starting in the morning during winter?

[EdenMarie]

It is a relatively normal phenomenon for the engine to idle higher during cold starts. When the car has been parked outside for a long time, the low temperature causes various fluids inside the car, such as engine oil and lubricants, to lose their fluidity, making it difficult for them to protect the engine. Here are some relevant details: If you press the accelerator hard immediately after a cold start, it can cause significant damage to the engine and transmission. Therefore, the car's system avoids this phenomenon by increasing the fuel injection and air intake when the engine temperature is too low after a cold start. The water temperature sensor sends corresponding signals to the ECU, which then raises the engine speed to help it warm up quickly. This allows the engine oil and lubricants to reach their normal operating temperature, ensuring the engine runs smoothly.