Pickup 4WD V6-2972cc 3.0L SOHC (1991)
Idle Speed: Adjustments
Idle Speed Adjustment
NOTE: Adjustment of idle speed is usually not required. If idle speed is out of specification check and verify the operation of the idle speed control
system. Refer to COMPUTERIZED ENGINE CONTROLS.
1.
Precondition the vehicle as follows:
a. Engine coolant temperature greater than 185 degrees F.
b. Lights, electric cooling fan, and all electrical accessories off.
c. Transmission in neutral or park.
d. Steering wheel in the neutral position.
e. Ignition timing verified correct.
Engine Idle Speed Inspection
2.
Insert a paper clip in the idle speed connector.
3.
Connect a tachometer to the inserted paper clip.
Self Diagnostic Connector
4.
Use a jumper wire to ground the self diagnosis/data transfer switching terminal of the diagnostic connector located inside the passenger
compartment under the dash.
Ignition Timing Diagnostic Connector
5.
Use a jumper wire to ground the ignition timing adjustment terminal.
6.
Verify Idle Speed.
Curb Idle Speed