Sincro DG83-D - Page 7

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CZ sincro
DG83 D
NOTE
In case the unit should not blink regularly, check:
• Against the light that the inductive clamp’s cores match; remove possible
dirtiness with a clean wiper.
• That the clamp’s arrow is pointing towards the opposite direction of the
spark-plug in points systems.
• That coil leads are not reversed
• Reversed polarity voltage in DIS systems (reverse the clamp with the
arrow poiting to the opposite direction of the spark-plug).
• Discharges between cap poles or to ground due to dirtiness or moisture
• Leakages to earth or between cables due to ageing or cracks in the
cable covering.
• Wear or excessive gap between central contact and rotor arm or
between rotor arm and poles or the distributor cap.
• Too low voltage on the spark-plug due to faults in the ignition system.
• Timing light too near to spark cables, distributor or ignition coil.
• Cable or interference suppressor with a too high or interrupted
resistance.
ATTENTION
• Some engines seem equipped with coil per plug system but they actually
are DIS systems (eg.: Peugeot 206, 306, ecc.). In this case connect the
inductive clamp to the cable connected to the coil's negative (–) pole
relevant to cyl. 1 - 2 (Fig. 9) and select 1 spark per revolution.
• Some motorbikes have special ignition systems with two sparks per
revolution. Doubled reading values appear if setting is not correct.
• Malfunctions in IAW MARELLI systems can be due to wrong distributor’s
position.
• For correct advance readings in points sytems, adjust the distributor’s
position. If the centrifugal advance does not correspond, check the
centrifugal expansion mechanism and the diaphragm of the vacuum
cap.
In case no advance variation is verified when connecting the cap tube,
check the diaphragm and the pivot of the baseplate.
• In points systems, advance differences between cylinders can be caused
by a different cam wear. Check that Dwell differences are within 3
degrees by connecting the inductive clamp to the spark cable of each
cylinder.
• Advance on vehicles equipped with engine management ECUs depends
on the processing of signals from different sensors.
It is possible to make advance checks in different conditions only if
comparison data are available.
In case differences should be found, it is necessary to check engine
temperature sensors or other causes that can influence advance
mapping.
• Should the initial advance correspond to the value stated by the
Manufacturer, and should the engine have cranking problems, check
that the distribution belt has not jumped a cog.
• Should you use a separate battery, connect the negative pole to the
engine ground.
Strokes System Spark/rev
4 Distrib. 1 every 2 revs
4 Coil per 1 every 2 revs
plug
4 D.I.S. 1 per rev.
2 Coil per 1 per rev.
plug
2 D.I.S. 2 per rev. *
Table.1:
*) Special systems. Set the
Strobotester as described in chapt.
8.2
NOTE
After connection to battery, the
Strobotester sets for 1 spark per 2
revs (distributor or coil per spark plug
ignition systems).
Some engines seem to be equipped
with coil per plug systems but they
are actually DIS systems (eg.:
Peugeot 206, 306, etc.).
On engines equipped with Twin
Spark DIS systems (eg.: Alfa Romeo),
select 1spark per rev.
Wrong settings cause wrong
readings of RPM, Advance and
Dwell.