Air Throttle Body Assembly

The air throttle body assembly controls air flow to engine through a single or a double butterfly valve. Throttle position is controlled by multiple-link, progressive opening throttle linkage, or a conventional cable/cam throttle linkage.

A by-pass channel on air throttle body assembly controls both cold and warm engine idle as regulated by an air by-pass valve assembly mounted to air cleaner (2.3L engine), upper intake manifold (2.9L engine), or throttle body (3.0L, 4.9L and 5.0L engines). The by-pass valve assembly is an electro-mechanical device controlled by EEC-IV module.

The air throttle body assembly incorporates a linear actuator which positions a variable area metering valve. It also features a preset stop to locate W.O.T. position, a throttle position sensor, canister purge ports for evaporative emission control (2.9L and 5.0L engines).

In addition, the air throttle valve assembly incorporates an adjustment screw to set throttle plate at minimum idle (2.3L and 3.0L engines), crankcase ventilation pressure tube (2.9L engine), closed throttle stop-set screw (2.9L engine), provision for EGR valve and sensor mounting (3.0L engine), a built in torsional return spring (3.0L engine), and individual ported vacuum taps for PCV and EVAP control signals (3.0L engine).

On the 4.9L engine, the air throttle valve assembly idle speed screw engages the secondary throttle lever (AOD transmission) and it engages the primary throttle lever for the C6 automatic transmission and all manual transmissions.