Mitsubishi MOTORS 3000GT Bedienungsanleitung Seite 485

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
Long Small
Length
Short Large
Large
Height High
Low Small
Slope Large
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
High Large
Low Small
ENGINE ELECTRICAL - Ignition System
Condition of Compression Concentration
electrode
force
Normal. Low
High
Large wear
Large wear High
Normal
Low
Plug is fouled -
Condition of Compression
electrode force
High
Large wear
Normal Low
TSB Revision
Ignition timing Spark
of air mixture
Rich
Advanced
Lean
Retarded
Lean Retarded
Rich _
Advanced
Ignition timing Spark
Concentration
of air mixture
Lean
Retarded
Rich
Advanced
plug cable
Leak
High
resistance
High
resistance
Leak
cable
High
resistance
Leak