These wires, sometimes called spark plug wires, basically deliver the high – voltage electricity from your ignition coil to the spark plugs. Think of it like a really important delivery service – the coil creates the spark, and these wires have to get it right to the plugs without losing any power along the way. They’re insulated, of course, to keep that high voltage contained and not arcing to other parts of the engine. They're a crucial part of the engine's ignition system. The spark plugs need that consistent, strong spark to ignite the air/fuel mixture in each cylinder. Without that spark, the engine won't run, or it'll run really poorly. They connect right from the distributor, or the coil packs on newer cars, directly to the spark plugs themselves. Well, these wires degrade over time from heat and the constant electrical pulses. The insulation cracks, the wires themselves can corrode, and that causes resistance. When that happens, less voltage gets to the spark plug. You’ll notice if they're bad – things like rough idling, misfires, reduced fuel economy, and a general lack of power. It’s one of those parts that, when it starts to fail, it’s pretty obvious something is up. They're relatively inexpensive to replace, and doing it can make a big difference. You can find a good selection of ignition wires at places like Fixparts Online, and swapping them out yourself is often pretty straightforward if you’re comfortable with a little DIY. Ignoring bad ignition wires can actually damage other parts of the engine, so it’s a good idea to address it when you notice problems. Highly recommended: Ignition Wire (MPN 12121719986) comes with a 12-month warranty!

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