Spark Plug Wires: Inspection

Spark plug wire integrity is vital for proper engine operation. A thorough inspection will be necessary to accurately identify conditions that may affect engine operation. Inspect for correct routing of the spark plug wires. Improper routing may cause cross-firing. Inspect each wire for any signs of cracks or splits in the wire. Inspect each boot for the following conditions:

• Tearing.
• Piercing.
• Arcing.
• Carbon tracking.
• Corroded terminal.

If corrosion, carbon tracking, or arcing are indicated on a spark plug wire boot or terminal, both the wire and the component connected to the wire should be replaced.