Adjustment W/ Volvo Test Diode

Fig. 340 CONNECT VOLVO TEST-DIODE:

1. Connect VOLVO test diode #5280.
2. Connect test diode green - white wire to test connector located in front of driver side strut tower (test connector has pink wire).
3. The test diodes red wire should be connected to the battery positive terminal (+). Fig. 340.
4. Connect tachometer and timing light.
5. Run engine to operating temperature and 10 minutes beyond.

Fig. 328 INSTALL CO ADJUSTMENT SEAL:

6. Ground blue - white wire at test connector Fig. 328. located in front of driver side strut tower.

Fig. 329 ADJUST IDLE SPEED:

7. Check and adjust idle speed with air conditioner off (700 RPM). Fig. 329.
8. Remove ground wire from test connector.
9. Engine speed should now be 750 ± 20 RPM. If idle speed is incorrect, see "IDLE SPEED" for more adjustment procedures.

Fig. 331 ADJUST IGNITION SETTING:

10. Check ignition setting (12° ±2) at idle speed. Fig. 331. Adjust timing by turning distributor.

Fig. 342 CHECK AND ADJUST CO:

11. Check CO content. Test diode Fig. 342. should blink if CO content is correct.
12. If test diode remains on, the CO content is to high.
13. If test diode remains off, the CO content is to low.

Fig. 333 REMOVE CO ADJUSTMENT SEAL:

14. To adjust CO, turn off engine.
15. Drill two 2 mm (0.08 in.) holes into the plug. Fig. 333.

Fig. 334 CO ADJUSTMENT:

16. Remove plug with needle nose or circlip pliers.
17. Start engine and run to operating temperature.
18. Adjust CO content until test diode starts to flash. Adjusting range for screw is 15 turns. Counter clockwise reduces CO content, clockwise increases CO content. Fig. 334.
19. Turn off engine. Disconnect all test equipment.
20. Seal CO adjustment screw with new plug. Tap new plug into position.