Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 1088

EXAMPLES OF ABNORMAL WAVEFORMS
Abnormal waveform
Example 1
Example 2
Example 3
Example 4
Example 5
ENGINE ELECTRICAL -
Wave characteristics
Spark line is high and short.
01P0215
Spark line is low and long, and is
sloping.
Also, the second half of the spark line
is distorted. This could be a result of
misfiring.
Spark line is low and long, and is
sloping. However, there is almost no
spark line distortion.
Spark line is high and short.
Difficult to distinguish between this
and abnormal waveform example 1.
No waves in wave damping section.
Ignition System
Cause of problem
Spark plug gap is too large.
Spark plug gap is too small.
Spark plug gap is fouled.
Spark plug cable is nearly falling off.
(Causing a dual ignition)
Layer short in ignition coil
16-33