Idle Relay; Sole-Vac Throttle Positioner; Idle Solenoid - Jeep 1987 Wrangler Workshop Manual

ENGINES
FUEL FEEDBACK SYSTEMS
Idle Relay
The idle relay (11) is energized by the M C U .
The MCU controls the vacuum actuator portion
of the Sole-Vac throttle positioner by providing a
ground for the idle relay.
The relay energizes the idle solenoid, which
allows vacuum to operate the Sole-Vac vacuum
actuator. This, in turn, opens the throttle and
increases engine RPM.
Sole-Vac Throttle Positioner
The Sole-Vac throttle positioner (12) is attached
to the carburetor.
The Sole-Vac throttle positioner consists of a
holding solenoid and a vacuum actuator.
The holding solenoid provides additional engine
idle speed when the air conditioner is in use.
The vacuum actuator is also activated at start-
up and during deceleration.
Idle Solenoid
The idle solenoid (13) is located on the same
bracket as are the upstream and downstream
solenoids (Pulse Air System).
The bracket is located on the cylinder head
cover.
The idle solenoid is energized electrically by the
MCU via the idle relay and allows vacuum to
operate the S o l e - V a c vacuum actuator to
increase idle speed.
B-25S