Pontiac 12072142 Wire, Spark Plug(12" Style Dd, L)

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To inspect the spark plug wires:Disconnect the plug wire from the spark plug by grabbing the rubber boot, twisting slightly, and pulling the wire off. Avoid pulling on the wire itself, only on the rubber boot.Check inside the boot for corrosion, which looks like a white crusty powder.Push the wire and boot back onto the end of the spark plug, ensuring a tight fit. If it's not secure, use pliers to crimp the metal connector inside the boot until it fits securely on the plug.Clean the entire length of the wire with a clean rag to remove dirt and grease.Check for burns, cracks, or other damage without bending the wire excessively or pulling it lengthwise to prevent conductor breakage.

Inside the boot, you should check for corrosion, which appears as a white crusty powder.

The wire and boot should fit securely on the spark plug. If it isn't a tight fit, remove the wire and use pliers to carefully crimp the metal connector inside the boot until it fits securely on the end of the spark plug.