Base Idle Testing

NOTE:
Use Loctite(R) 242 on threads before reinstalling.

1. Turn off all electrical accessories.

2. Connect an accurate tachometer (do not use vehicle tachometer).

3. Clamp idle speed control air bypass hose.

4. Observe idle speed; it must be 525 +/-25 rpm.

5. If idle speed is not correct, remove tamper-proof plug from idle speed bypass screw.

6. Adjust idle speed until correct.

7. Remove clamp from bypass hose.

8. Replace tamper proof plug.

9. If MIL code 48 sets, reset code.