The classic Focus hatchback throttle motor keeps ringing when it is energized. What happened?

Upstairs, I don't know what to say. Throttle has nothing to do with dirty air.

This is a common problem of Fox. I just went to 4s to wash it last month (more than 6000 kilometers, free).

Turn on the key rudely, and keep the shift from 2200 to 2500 at least. Don't worry about fuel consumption, high-speed shifting will save fuel!

And don't wait long, so the throttle won't get dirty so easily.