Caprice V8-265 4.3L VIN W MFI (1995)
Throttle Body: Description and Operation
Throttle Body
The throttle body assembly is attached to the intake manifold and is used to control air flow into the thereby controlling engine output. The throttle
valves within the throttle body are opened by the vehicle operator through the accelerator controls. During engine idle, the throttle valves are almost
closed. and air flow control is handled by a fixed air bypass orifice and the Idle Air Control (IAC) valve. To prevent throttle valve icing during cool
weather operation, engine coolant is directed through the coolant cavity on the bottom of the throttle body.
The throttle body also provides the location for mounting the Throttle Position (TP) sensor and for sensing changes in engine vacuum due to throttle
valve position. Vacuum points are located at, above, or below the throttle valve to generate vacuum signals needed by various components.
