13.7
Adjusting CO value
L Note:
Engine must be at operating temperature (85 °C).
Basic settings (ignition timing, valve clearances)
must be correct.
•
Insert the measuring probe (arrow) app. 30 cm
(12 in) into the silencer (muffler).
e Caution:
Do not perform this measuring work in an enclosed
space: risk of asphyxiation.
L Note:
If the air extraction equipment is unsuitable, it may
falsify the measurement.
•
Run the engine at idle speed.
e Caution:
Adjusting screw (2) has no limit stop in both direc-
tions.
•
Turn adjusting screw (2) to obtain correct CO.
L Note:
Turn in direction (1) for a richer mixture; the CO value
will rise to a maximum. Turning further in direction (1)
has no effect on the CO value.
Turn in direction (3) for a leaner mixture; the CO val-
ue will drop to a minimum. Turning further in direc-
tion (3) will cause the engine’s emergency-run
programme to operate, but has no influence on the
CO value.
e Caution:
If the engine’s emergency-run programme operates,
fault 1111 will be memorised in the engine control
unit.
•
If necessary, carry out fault diagnosis, rectify the
fault and cancel the memory entry.
•
Using the BMW Synchrotester, adust idle speed
at the recirculating-air screws.
CO value................................... 1,5 ± 0,5 % by vol.
Idle speed
..........................................950 ± 50 rpm
LT000290
LT000300
2
1
3
