Why is the idle speed still high after cleaning the throttle?

Because there will be dust in the intake process of the engine for a long time, these dust will accumulate on the throttle plate for a long time, and then more and more carbon will be deposited.

Therefore, when the throttle reciprocates, it will be resisted for a long time. If this situation continues, the engine computer will adjust the position of the throttle valve to increase the opening of the replica.

After the vehicle cleaned the intake valve, the flap still moved in the original formation, indicating that the throttle valve 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.

The solution is to connect the OBD socket of the automobile with the automobile diagnosis computer and make the basic setting of the throttle. If the basic settings are not made, the engine computer will adjust and recover after driving for a period of time.