If you’ve noticed that your GMC is not accelerating as well as it usually does, or your truck is idling a little rough, it may be time to change your spark plug wires. Your GMC K3500 Spark Plug Wires are each connected to a spark plug. These wires connect the spark plugs to the ignition coils and are responsible for ensuring that an electric spark can travel from the former to the latter and ignite the fuel in the engine’s cylinders.

It is therefore important to keep your GMC K3500 Spark Plug Wires properly maintained, like all your vehicle’s other parts, to keep them functioning properly and to increase the life of the wires. There are several different possible problems that you may encounter with your spark plug wires.

These problems include corrosion of the wires, a break down in the insulation of the wires, causing energy to leak out, increased resistance (spark plug wires are normally designed to have a great deal of resistance), or vibrations that can cause the wires themselves to break. If you notice any of these problems, it is time to replace your GMC K3500 Spark Plug Wires. Changing your spark plugs wires is usually quite simple and does not require any tools. All you need to do is locate the wires, which are usually black but can also come in a variety of colors including orange, blue, or red, pull each wire out one at a time by the boot (located at the end of the wire), and put in the new ones. See? Piece of cake. Spark plug wires are usually replaced as part of a 30,000 mile tune-up.Talk to your mechanic, however, and make sure that the spark plug wires are checked and replaced if needed (some auto shops will not automatically check and change them because it drives up the cost of the tune-up).