Does the car need to be equipped with a throttle after cleaning? Why?

Thanks for cleaning the throttle to match the working time of the engine. After a long time, a layer of grease will be deposited on the inner wall of the throttle valve. This grease is mainly caused by the oil vapor in the engine exhaust gas deposited on the upper wall of the inner wall of the throttle when it passes through the throttle during recirculation. Unclean throttle will affect the accuracy of engine computer calculation of air intake, and inaccurate computer calculation of air intake will lead to inaccurate fuel injection control. Difficult cold start, unstable idle speed and high fuel consumption. Why do you need to match after cleaning the throttle, which cars need computer matching and which cars don't? Before cleaning, the gap between the valve and the inner wall of the throttle valve is the throttle opening that keeps idling after being constantly adjusted by the computer. After cleaning the grease, the gap between the valve and the inner wall becomes larger. If the throttle does not match the initialization, the problem of unstable idle speed will occur. Which cars need computer matching and which don't? More than 90% domestic cars don't need computer matching. After cleaning and opening for a while, the computer will adapt itself. Some Japanese cars have to be matched by computer. European and American cars have to be matched by computer.