ENGINE ELECTRICAL
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Ignition System
16-43
Wave-form Observation Points
/
L
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
Concentra-
Ignition timing High tension
electrode force tion of air
mix-
cable
ture
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
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Point B: Number of vibrations in reduction vibration section
(Refer to abnormal wave-form example 5)
Number of vibrations
Coil and condenser
I
3 or higher
/
Normal
Except above
Abnormal
Point C: Height of Zener voltage
Height
of Zener voltage
Probable cause
Higher
Problem
in Zener diode
Lower
Abnormal resistance in pri-
mary coil circuit
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