Automatic Transmission

Fig. 14 Intake Air Control Diaphragm:

NOTE: Perform the idle speed adjustment with the engine at its normal operating temperature (cooling fan should cycle on and off at least once).

1. Remove the vacuum hose from the air intake control diaphragm and clamp the hose closed, Fig. 14.

Fig. 22 Pinching Vacuum Hose Between Vacuum Solenoid Valve 'C' And The Vacuum Chamber:

2. Connect a tachometer to the engine.
3. Use a clamp to pinch closed the vacuum hose between frequency solenoid valve C and the vacuum chamber, Fig. 22.

Fig. 23 Idle Control Screw Initial Adjustment (Automatic Transmission):

4. Back the idle control screw out until the end is flush with the bracket, Fig. 23. With all power consumers switched OFF, (headlights, heater blower, rear window defogger, A/C, etc.), and the transmission in neutral, use the throttle stop screw to lower the idle speed to 580 rpm or less.

Fig. 25 Idle Control Screw (Automatic Transmission):

5. Now adjust the idle speed back up to 630 +/- 50 rpm with the idle control screw, Fig. 25.
6. Adjust the idle speed (in neutral) up to 700 +/- 50 rpm with the throttle stop screw.

Fig. 26 Adjustment Screw 'A' (Automatic Transmission):

7. With the parking brake set and blocks under the rear wheels, put the transmission in a drive gear. Adjust the idle speed using adjustment screw 'A', Fig. 26.

Idle speed should be:
675 +/- 50 rpm (high altitude)
700 +/- 50 rpm (low altitude)

8. Shift the transmission into neutral.

Fig. 27 Adjustment Screw 'B' (Automatic Transmission):

9. If the car is equipped with A/C, switch the A/C ON, and adjust the idle to 700 +/- 50 rpm with adjustment screw 'B', Fig. 27.
10. Disconnect the air cleaner intake tube from the air intake duct.