Ford E9PZ-12259-K Kit

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First of all, it is important to apply silicone dielectric compound to the inside of each boot when replacing spark plug wires. In a well-ventilated garage with poor lighting, watch the wires while the engine is running for any arcing or sparking. Mark each wire for reinstallation and disconnect it by twisting and pulling off the boot using a removal tool. Check them thoroughly for cracks or burns. Replace them one by one in the correct firing order. Look out for carbon tracks, cracks, and worn terminals as you replace the distributor cap and rotor. When fitting a new cap, transfer the wires across individually to avoid confusion.