Mitsubishi MOTORS 3000GT Bedienungsanleitung Seite 489

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
Length Long Small
Large
Short
Large
Height High
Small
Low
Slope Large
Point B: Number of vibrations in reduction vibration section
(Refer to abnormal wave-form example 5)
Number of vibrations
3 or higher
Except above
Point C: Height of Zener voltage
of Zener voltage
Height
Higher
Lower
ENGINE ELECTRICAL
Condition of Compression
electrode force
Normal Low
Large wear High
Large wear High
Normal Low
Plug is fouled
Coil and condenser
Abnormal
Probable cause
in Zener diode
Problem
Abnormal resistance in pri-
mary coil circuit
TSB Revision
Ignition timing High tension
tion of air mix-
ture
Advanced
Rich
Lean Retarded
Lean Retarded
Advanced
Rich
cable
Leak
High
resistance
High
resistance
Leak