What is the reason for the high idle speed of KIA Jiahua 2.7 cleaning throttle?

It may be because carbon deposits block the idle passage, which makes the throttle or idle motor stuck or out of its adjustment range.

Or the throttle valve is stuck due to excessive carbon deposition and cannot return,

This will cause the idle speed to rise after receiving oil.

After cleaning the throttle, the idle speed of oil collection will increase in many cases.

This is because the carbon deposition solution will enter the shaft of the throttle valve when cleaning the carbon deposition.

Causing the throttle shaft to be stuck by the valve seat,

Sometimes it is very serious to replace the throttle body or idle motor.