Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 191

16-16
WAVEFORM OBSERVATION POINTS
Point A: The height, length and slope of the spark line show the following trends (Refer to abnormal
waveform examples, 1, 2, 3 and 4).
Spark line Plug gap
Long Small
Length
Short Large
High Large
Height Height
Low Small
Slope Large
Point B: Number of vibration in reduction vibration section (Refer to abnormal waveform example 5)
Number of vibrations
Three or more
Except above
Point C: Number of vibrations at beginning of dwell section (Refer to abnormal waveform example 5)
Number of vibrations
5 - 6 or higher
Except above
Point D: Ignition voltage height (distribution per each cylinder) shows the following trends.
Ignition
Plug gap
voltage
High Large
Low Small
ENGINE ELECTRICAL -
Condition of Compression
electrode
Normal
Large wear
Large wear
Normal
Plug is fouled
Coil and condenser
Normal
Abnormal
Coil
Normal
Abnormal
Condition of Compression
electrode force
Large wear High
Normal Low
Ignition System
Concentration of
force air mixture
Low Rich
High Lean
High Lean
Low Rich
- -
Concentration of
air mixture
Lean
Rich
Ignition timing Spark plug
Advanced
Retarded
resistance
Retarded
resistance
Advanced
-
Ignition timing Spark plug cable
Retarded High resistance
Advanced Leak
cable
Leak
High
High
Leak
-