The throttle body is a valve that controls how much the engine inhales. It is a round steel piece with a shaft in the middle that is connected to the throttle cable and controlled by the throttle cable. The throttle body is a device on the engine intake system. The throttle body is generally divided into three parts: the actuator, the throttle piece and the throttle position sensor, which are generally packaged in one piece. The water pipes on the side are exhausted to meet certain emission standards.