Ranger 2WD V6-177 2.9L (1989)
Throttle Body: Description and Operation
Throttle Body
The throttle body assembly controls airflow to the engine through a butterfly-type valve. The throttle angle is controlled by multiple-link, progressive
opening throttle linkage. The body is a single-piece die casting made of aluminum.
An air bypass tube directs air around the throttle to an air bypass valve mounted directly to the upper intake manifold. The valve regulates idle airflow as
a function of a duty cycle electronic signal from the EEC-IV computer.
Other features of the air throttle body assembly include.
a.
A machined boss and stamped lever to locate wide-open throttle (WOT).
b.
A throttle position sensor mounted to the throttle body.
c.
Canister purge port for evaporative emission control
d.
Crankcase ventilation pressure tube.
e.
Closed throttle stop-set screw.
