E9-E18 CO% Adjustment Using CO Meter

E9 Connect test equipment

(2) Co Adjustment With CO-meter:

- Connect tachometer.
- Connect stroboscope.
- Connect CO% meter.

- Warm-up engine
- Run engine at 1500 rpm.

NOTE: Warm-up engine until radiator thermostat opens and then for a further 5 minutes.

E10 Check Idle Speed

Fig. 326 IDLE SPEED TEST CONNECTOR:

- Ground red-white wire.

NOTE: Switch off AC as applicable.

- Check idle speed.

E11 Adjust Idle Speed





- Adjust engine speed with idle adjustment screw to 700 rpm.
- Disconnect ground from test point.
Engine speed should increase to 750±20 rpm

If values are incorrect: check/adjust Throttle Body and/or Throttle Cable/Linkage.

E12 Check/Adjust Ignition Setting
Idle speed fluctuations can affect ignition setting. Make sure that fluctuations are not greater than 25 rpm.
If greater, check air control valve hoses for blockages.
- Check ignition timing with stroboscope.
Ignition setting should be 12° BTDC at idle.





- Adjust setting by turning distributor body.

E13 Check CO





- Disconnect Lambda sond
- Check CO-content.
CO-content = 0.4-0.8 %.

E14 Adjusting CO
CO should only be adjusted after all possible faults have been checked/rectified.

NOTE: CO must be checked/adjusted within 5 minutes of radiator thermostat opening.

- Turn off engine.





- Drill two 2 mm (0.08 in.) holes in plug.
- Withdraw plug with circlip pliers.
- Start engine.

E15 Adjust CO
- Adjust CO content to 0.6 %.





Counterclockwise reduces CO
Clockwise increases CO
Adjustment range = 15 turns.

E16 Connect Lambda sond





- Reconnect Lambda sond

E17 Turn Off Engine
- Disconnect test equipment.
- Install plug in exhaust pipe.





WARNING: Adapter can be extremely hot.

E18 Seal CO Adjustment Screw





Use a new plug.
- Tap plug into position.