Well, there it is, the spark plug wire has been pulled out of the metal clip inside the boot. ... There's no need to panic or buy a new set of plug wires. This one can be repaired, not just to satisfactory, but like new. Besides, the auto repair shop does not sell just one wire.
Keeping this in consideration, should I change my spark plug wires when I change my spark plugs? That's because spark plug wires aren't actually made of wire. They're made of delicate carbon fibers. ... That's why it pays to replace your spark plug wires before they wear out. We recommend changing them during spark plug changes (whenever your owner's manual recommends, usually between 60,000 and 100,000 miles).
Its center electrode should have a flat top. If its top is rounded, then the spark plug must be replaced. Look for cracks or chips in the spark plug's porcelain sheath as well as pitting on its firing electrode.
Common signs of failing spark plug wires include a decrease in power, acceleration, and fuel efficiency. In addition, the engine light coming on or visible damange to the cables can be signs of a failing wire.
Remember to leave additional length in the wires to enable the distributor to freedom of movement. ... By reducing the resistance in the plug wires, the coil does not have to work as hard because less voltage is lost to the resistance between the coil and spark plug.