Dodge D150 1990 Service Manual page 737

14 - 54 FUEL SYSTEM
Fig. 15 Idle Speed Control (ISC) Actuator Service
Installation and Adjustment
WARNING: APPLY PARKING BRAKE AND/OR
BLOCK WHEELS BEFORE PERFORMING IDLE
CHECK OR ADJUSTMENT.
(1) I n s t a l l t h e idle speed control actuator t o t h e
support bracket w i t h washers and m o u n t i n g nuts.
(2) A t t a c h electrical connector.
(3) S t a r t t h e vehicle and allow t o r u n for two m i n -
utes.
(4) Shut vehicle off. A l l o w 60 seconds for the actu-
ator shaft t o f u l l y extend.
(5) Disconnect t h e w i r i n g connector t o t h e idle
speed control actuator.
(6) Disconnect the w i r i n g connector t o the coolant
temperature sensor.
(7) Hook u p a tachometer t o the engine.
(8) Start t h e vehicle.
(9) Adjust t h e extension screw o n t h e actuator
shaft (Fig. 16) u n t i l t h e r p m is w i t h i n the specifica-
tions shown:
3.9L E n g i n e :
• I f vehicle mileage is less t h a n 1000 miles, set to
2400-2500 r p m
• I f vehicle mileage is greater t h a n 1000 miles, set
to 2500-2600 r p m
5.2L a n d 5.9L E n g i n e :
• I f vehicle mileage is less t h a n 1000 miles, set to
2650-2750 r p m
• I f vehicle mileage i s greater t h a n 1000 miles, set
to 2750-2850 r p m
(10) Shut off vehicle.
(11) Reconnect t h e ISC actuator motor electrical
connector.
(12) Reconnect the Coolant Temperature Sensor.
•
Fig. 16 Adjusting the Idle Speed Control (ISC)
Actuator
VACUUM MANIFOLD
Removal
(1) Remove the a i r cleaner.
(2) Disconnect battery negative cable.
(3) Remove t h e t h r o t t l e body. Refer t o " T h r o t t l e
Body Removal" i n this section.
(4) Remove vacuum m a n i f o l d m o u n t i n g screw (Fig.
17).
(5) Remove manifold and any gasket m a t e r i a l o n
surface o f t h r o t t l e body.
Fig. 17 Servicing Vacuum Manifold
Installation
(1) I n s t a l l vacuum m a n i f o l d w i t h a new gasket.
(2) T i g h t e n a t t a c h i n g screws t o 4 N»m (35 i n . lbs.)
torque.
(3) I n s t a l l t h e t h r o t t l e body. Refer t o " T h r o t t l e
Body I n s t a l l a t i o n " i n t h i s section, use a n e w base
gasket w h e n i n s t a l l i n g t h e t h r o t t l e body.
(4) I n s t a l l the a i r cleaner.
(5) Connect the battery negative cable.