Use long needle-nose pliers to pull the broken plastic extension off, working it off in pieces if needed until the metal can be reached. A cheap snap-off razor knife can help cut away the rubber insulation. After the old wire is removed, apply dielectric grease to the new plug wires before installation so they do not melt onto the spark plugs.
The owner of a 1995 Toyota Camry 2.2 broke the plastic extension on a spark plug wire and asked how to remove it so the wire can be replaced. The expert suggested using long needle-nose pliers, possibly removing it in pieces, and a snap-off razor knife to cut the rubber insulation. Dielectric grease should be applied to the new plug wires before installation to prevent them from melting onto the plugs.
