Idle Speed Adjustment Procedure - W/Computer Control

Carbureted
1982 1.8L (112), 4.1L (252): With engine at operating temperature, turn ignition off and disconnect harness from ISC. Apply 12 volts (+) to third terminal from top of ISC (C), and ground the fourth terminal from top (D) only long enough to retract ISC plunger. With engine running, set minimum idle to specified value by adjusting carb base screw. Apply 12 volts (+) to fourth terminal from top of ISC (D) and ground the third terminal from top (C) only long enough to fully extend ISC plunger. Set maximum speed to specified value by turning ISC plunger head.
Never apply voltage to first two upper terminals (A & B) or damage to the unit will result.

1986-90 5.0L (307): Disconnect and plug vacuum hoses at EGR and canister purge valves. With engine at operating temperature, remove vacuum hose from ILC and plug. Set maximum speed to specified value by holding hex nut and turning plunger shaft. Reconnect ILC vacuum hose and check that minimum speed is at specified value. To adjust, remove rubber and metal plugs from rear center outlet tube, insert a 3/32" Allen wrench. Remove ILC hose and plug. Connect a remote vacuum source and apply vacuum to the unit. Adjust carb base screw to obtain specified base value.