RAM 2500 Truck 4WD V10-8.0L VIN W (1997)
Throttle Body: Description and Operation
DESCRIPTION
Fig. 33 Air Control Passage
The throttle body is mounted on the intake manifold. It contains an air control passage controlled by an idle air control (IAC) motor. The air
control passage is used to supply air for idle conditions. A throttle valve (plate) is used to supply air for above idle conditions.
OPERATION
Fig. 32 Throttle Body
Filtered air from the air cleaner enters the intake manifold through the side mounted throttle body. Fuel does not enter the intake manifold through
the throttle body. Fuel is sprayed into the manifold by the fuel injectors.
The throttle position sensor (TPS) and idle air control (IAC) motor are attached to the throttle body. The accelerator pedal cable, speed control
cable and transmission control cable (when equipped) are connected to the throttle arm.
A (factory adjusted) set screw is used to mechanically limit the position of the throttle body throttle plate. Never attempt to adjust the engine idle
speed using this screw. All idle speed functions are controlled by the Powertrain Control Module (PCM).
