The magnetic field around one wire induces a current in the second wire, causing the other spark plug to fire prematurely. A different type of misfire called “crossfire” may occur if two plug wires are routed parallel to each other and the two cylinders follow each other in the firing order.The metal clips that attach the ends of the wires to the spark plugs and coils or distributor cap can also loosen or be damaged by vibration or improper handling.Boots that seal the ends of the wires can be deformed or pulled loose, allowing moisture to sap away voltage before it reaches the spark plug.The carbon conductor that carries voltage inside some types of wire can degrade after years of use, causing an increase in resistance that may cause misfires.Unsupported wires can vibrate and rub against sharp edges, causing the insulation to wear through and short out the wire.Plug wires may burn through and short out if they lay against a hot exhaust manifold (depending on the heat resistance of the outer jacket around the wire).Spark plug wires are vulnerable to heat, vibration, aging, moisture and physical damage from mishandling during installation or removal. ![]() We’re talking firing voltages that can range from 5,000 volts to as much as 50,000 volts! That’s a lot of electrical energy to keep contained inside a wire. ![]() ![]() Plug wires are necessary to carry high voltage from the ignition coil to the spark plug.
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