Emission Control Systems: Adjustments

Fig. 404 IDLE SPEED SCREW:

Idle speed adjustment:
1. Connect a photoelectric RPM-meter (or use VOLVO MONOTESTER and adapter #9950)
2. Warm up engine and idle additional five minutes after thermostat has opened
3. Turn off air conditioner
4. Adjust idle speed with idle screw Fig. 404. to 830 ± 50 RPM
5. Seal idle screw and lock nut with paint after adjustment