How long does it take for the idle speed to drop down to normal?

[MacLiam]

It is normal for the idle speed to drop down after half an hour. The reasons why the car has a high idle speed when starting and then drops to the normal value after a while are: 1. A high idle speed when starting is a normal phenomenon, as the car needs high RPM to allow the engine to reach normal operating conditions as soon as possible; 2. Excessive carbon deposits; 3. Timely cleaning of the throttle valve and idle speed motor can solve the problem. Idle speed is a working condition of the car, referring to the engine running in neutral gear. The engine speed at idle is called the idle speed, which can be adjusted by changing the throttle size, etc. Idle speed means the engine is producing power but not doing work.