12 hand washing of the new sylphy throttle. What is the reason for the high idle speed of cold cars?

Computer matching unfinished questions.

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. Resulting in high idle speed. In this case, computer programming is required. If you don't do it, the engine computer will take a long time to adjust and recover.