Why is the throttle idling high after washing the car?

First, because there will be impurities in the intake process, these impurities will accumulate at the throttle for a long time, and the carbon deposition will be more and more after a long time. When the throttle valve reciprocates, it will be resisted and will last for a long time.

The power computer will adjust the position of the accelerator pedal. That is to say, the position of carbon deposition is regarded as the ontology, that is to say, the throttle valve is not at all but near the position of carbon deposition.

Second, the solution is as follows:

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.

Thirdly, the idle speed can be adjusted by adjusting the 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.