ENGINE ELECTRICAL
-
Ignition System
16-39
Wave-form Observation Points
Point A: The height, length and
slope~of
the spark line (refer to abnormal wave-form examples
1,
2, 3
and 4) show the following ‘trends.
’
\
Spark line
Plug
gap
Condition of Compression Concentration
electrode
force
Ignition timing Spark
of air mixture
plug cable
Length
Long Small
Normal.
Low
Rich
Advanced
Leak
Short Large
Large wear
High Lean
Retarded
High
resistance
Height
High
Large
Large wear
High
Lean
Retarded
High
resistance
Low Small Normal
Low
Rich
_
Advanced
Leak
Slope Large
Plug is fouled
-
Point B: Number of vibrations in reduction vibration section (Refer to abnormal wave-form example 5)
Point C: Number of vibrations at beginning of dwell section (Refer to abnormal wave-form example 5)
Point D: Ignition voltage height (distribution per each cylinder) shows the following trends.
Ignition
voltage
Plug
gap
Condition of Compression
Concentration
electrode
Ignition timing Spark
force of air mixture
plug
cable
High Large
Large wear
High Lean
Retarded
High
resistance
Low Small
Normal
Low
Rich
Advanced
Leak
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