Idle Speed: Adjustments

Adjustment of Idling Speed (LH 2.2 with idle air control valve)

1 Remove the hose from the throttle body, open the throttle fully and wash the area round the throttle butterfly.

2 Start the engine and warm it up. It is important for the gearbox oil to be warm.

3 Slacken and adjust the throttle damper so that the throttle lever is not activated.

4 Unplug the throttle position switch connector and connect pins 1 and 2 together (simulating a closed throttle position switch, which is important when adjusting the idling speed).

5 Remove the two throttle position switch retaining bolts and rotate the switch so that the throttle will not be activated. Check that the throttle cable is slack and cannot activate the throttle.

6 Start the engine and run it at idling speed. Make sure that no other loads are engaged, such as Drive, NC, radiator fan, etc. Adjustment must not be carried out when the radiator fan is turned on.

7 Connect cable 83 93 886 with switch between the test socket on the left-hand side of the engine bay and battery negative. Set the switch to ON.




8 Cars with idle speed adjusting screw
Screw in the idle speed adjusting screw fully and tighten the locknut.

9 Slacken the throttle adjusting screw's locknut, using spanner 83 94 322, and adjust idling speed to 750-775 rpm. Then lock the adjusting screw with the nut.

10 Set the switch in cable 83 93 886 to OFF. Check that idling speed is stabilized at 850 ± 75 rpm.

11 Switch off the engine and adjust the throttle position switch so that a click is heard when the throttle is rotated away from the closed throttle position. Do not confuse this sound with the click made by the shift-up switch.

12 Screw the throttle position switch in place. Remove the jumper lead and plug in the position switch.

13 Adjust the throttle damper so that it closes the throttle within 4 ± 1 second. Tighten the locknut.

14 Remove the wiring.