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2. Inspect the insulator (2) for flashover or carbon tracking, soot. This is caused by the
electrical charge traveling across the insulator (2) between the terminal post (1) and ground.
Inspect for the following conditions:
3. Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the
crack instead of the electrodes (3, 4).
• Inspect the spark plug boot for damage.
• Inspect the spark plug recess area of the cylinder head for moisture, such as oil, coolant,
or water. A spark plug boot that is saturated causes arcing to ground.
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Document ID: 1456106
7/5/2010
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