Mitsubishi 3000GT - Page 490

ENGINE ELECTRICAL - Ignition System
EXAMPLES OF ABNORMAL WAVE-FORMS
Abnormal wave-form
Wave characteristics
Cause of problem
Example 1
Spark line is high and short.
Spark plug gap is too large.
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Example 2 Spark line is low and long, and is
sloping. Also, the second half of
Spark plug gap is too small.
the spark line is distorted. This
could be a result of misfiring.
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Example 3
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Spark line is low and long, and is
sloping. However, there is almost
Spark plug gap is fouled.
no spark line distortion.
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Example 4 Spark line is high and short.
Spark plug cable is nearly falling
off. (Causing a dual ignition)
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Example 5 No waves in wave damping set-
tion.
Rare short in ignition coil.
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