Throttle Body

The throttle body has a throttle valve to control the amount of air delivered to the engine. Mounted on the throttle body are the TPS and IAC valves. The throttle body also contains vacuum ports located at, above or below the throttle valve. These ports provide the necessary vacuum signals needed by various components. To prevent icing, engine coolant is directed through the bottom of the throttle body. See Fig 1 .

Fig 1: Exploded View of Typical Throttle Body All models have similar parts in different configurations. Courtesy of General Motors Corp.