Throttle Body: Description and Operation

The throttle body has the following features:
- controls airflow to the engine through a butterfly-type valve.
- throttle position is controlled by a single lever and accelerator cable linkage.
- die-cast aluminum, single-piece body
- a single bore with an intake air channel around the throttle valve. This channel controls both cold and warm intake air control as regulated by an Idle Air Control Valve (IAC Valve) which is mounted to the surge tank connector.
- a throttle body-mounted Throttle Position Sensor (TP Sensor).

The idle air control valve:
- is an electro-mechanical device controlled by the Powertrain Control Module (PCM).
- incorporates a linear actuator which positions a variable area metering valve.