Visual Inspection

VISUAL INSPECTION OF SPARK PLUG WIRES AND BOOTS
1. Check the routing of the wires. Improper routing can cause crossfiring.
2. Check each wire for any signs of cracks or splits in the wire.
3. Inspect each boot for signs of tears, piercing, arc through, or carbon tracking. If the boot needs to be replaced, twist it a half turn in either direction to break the seal before pulling on the boot to remove the wire.