Aerostar 2WD V6-183 3.0L (1991)
Throttle Body: Description and Operation
Throttle Body Assembly
The air intake throttle body assembly controls airflow to the engine through a single butterfly-type valve. The throttle position is controlled by a
conventional cable through throttle linkage. The body is a single-piece die casting made of aluminum. It has a single bore with an air bypass channel
around the throttle plate. This bypass channel provides engine idle control as regulated by an air bypass valve assembly mounted directly to the throttle
body. The valve assembly is an electro-mechanical device controlled by the EEC-IV computer. It incorporates a linear actuator which positions a
variable area metering valve.
Other features of the air intake throttle body assembly include:
a.
An adjustment screw to set the throttle plate at idle position. This screw is pre-set at the factory.
b.
A pre-set stop to locate the WOT position.
c.
A throttle body mounted throttle position sensor.
d.
Provision for EGR valve and sensor mounting.
e.
Individual vacuum taps (as required) for PCV, EVAP and vacuum sensing EEC sensors and controls.