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4.4 Common causes of short burn time readings
• Spark plug worn or gap too wide.
• Spark plug connector damaged, loose or disconnected.
• Excessive resistance in the ignition coil primary circuit.
• Lean mixture.
4.5 Common causes of low spark KVolt readings
• Shorted, dirty or too small spark plug gap.
• Dirty or damaged spark plug insulator boot allowing spark “tracking” across
insulator.
• Broken core in spark plug wire. Break is located between the distributor (or DIS coil)
and the test point.
• Short circuit, disconnection or partial disconnection between the distributor (or DIS
coil) and spark plug wire.
• Rich mixture. Most likely due to leaking fuel injector, or faulty oxygen sensor.
• Low cylinder compression pressure. Could be caused by leaking valves, worn piston
rings, blown cylinder head gasket, etc.
4.6 Common causes of high spark KVolt readings
• Spark plug worn or gap too wide.
• Spark plug connector damaged, loose or disconnected.
• Broken core in spark plug wire. Break is located be tween the spark plug and the
test point.
• Lean mixture.
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