Idle Speed: Adjustments

1. Start the engine and warm it up until the water temperature indicator points to the middle of the gauge.
2. Operate the engine at 2000 rpm for 2 minutes under no load.
3. Verify ignition timing is 15° ± 2° B.T.D.C.
4. Check the idle speed.
Idle speed should be 750 ± 50 rpm (A/T in "N" position).
If not proceed to step 4.

Fig. 52 Selecting Modes:

5. Close the AAC valve fully, by turning the diagnostic mode selector on the E.C.U. fully clockwise (located on the floor in front of the center console).
^Do not turn it back.

Fig. 61 Idle Speed Adjusting Screw:

6. Adjust the idle speed to 700 ± 50 rpm (A/T in "N" position ) by turning idle adjusting screw on the auxiliary air control valve (located on the L.F. side of the intake plenum).


7. Operate the engine at 2000 rpm for 2 minutes under no load.
8. Hold the engine at 2000 rpm and make sure the green ECU inspection lamp flashes more than 5 times in 10 seconds.
9. Race the engine two or three times and let it idle.
10. Turn diagnostic mode selector fully counterclockwise to set it in mode 2.
11 . Repeat step 7.