After cleaning the throttle, abnormal acceleration sound appears in 3rd gear.

After cleaning the throttle, the function of the throttle position sensor is to convert the position or opening of the throttle into a voltage signal, which is transmitted to the electronic control unit as the basis for the electronic control unit to judge the engine working condition, so as to realize the fuel injection control under different throttle openings.

There are three kinds of throttle position sensors: linear pure bridge type, switch type and comprehensive type (both switch and linear variable resistor). The throttle position sensor is installed on the throttle body and linked with the throttle. Inside the throttle position sensor is a sliding potentiometer whose sliding contact is driven by the throttle shaft. The resistance value of the potentiometer is different with different throttle opening, so that the throttle opening is converted into a resistance or voltage signal, which is sent to accurately detect the idling condition (throttle fully closed state). The integrated throttle position sensor has an idle contact. When the throttle valve is completely closed, the idle output contact is turned on and the sensor outputs an idle signal. At this time, the ECU will instruct the fuel injector to increase the fuel injection quantity to enrich the mixture.