Checking the spark advance
The ignition advance is determined electronically
on the basis of parameters known by the control
unit. For this reason it is not possible to interpret
the reference values based on the engine rpm.
The ignition advance value is detectable at any
time using the diagnostic tester. It is possible to
check whether the ignition advance determined by
the injection system matches the value actually
activated on the engine, by means of the strobo-
scopic light.
Proceed as follows:
- Remove the spark plug.
- Remove the plastic cover on the flywheel cover
shown in the photograph.
- Remove the transmission compartment air intake
cover shown in the photograph.
- Rotate the driving pulley fan using a screwdriver
until the reference marks between the flywheel
and flywheel cover coincide as shown in the pho-
tograph.
- Bring the reference mark onto the transmission
side between the fan and the transmission cover
as shown in the photograph.
- Refit the spark plug.
- Refit the plastic cap on the flywheel cover.
- Adjust the spark gap to the contact position (no
reference mark visible) and install it on engine be-
tween the spark plug and spark plug cap
- Connect the induction clamp on the spark gap
cable respecting the proper polarity (the arrow on
the clamp must be pointing at the spark plug).
- Connect the diagnostic tester.
- Start the engine.
- Select the «parameter» function in this menu.
Maintenance LXV 125
MAIN - 30
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