What happens when the idle speed becomes lower after washing the throttle?

After the vehicle cleaned the intake valve, the flap still moved in the original formation, which showed that it was not in place, but the carbon deposit was cleaned. So the air intake will be a little more than usual. This will lead to high idle speed.

Idle speed can be adjusted by adjusting throttle opening and idling oil supply. Generally speaking, the minimum idle speed is the best when the engine does not shake in the idle speed range and the acceleration performance is good.