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The spark takes the path of least resistance. The boot may be old and cracked and/or the spark plug may be worn and has a large gap at the electrode.

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Q: Why are plug wires arcing through the boot?
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Why does Black and Decker 6746 plug smoke?

Because the wires in plug OR socket are loose and arcing.


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Give the spark plug boot a twist to free it from the spark plug then pull it off of the spark plug by the boot.


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Pull on the boot.


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Twist boot then pull, this will break the seal from the plug.


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Grasp the plug wire by the boot then rotate and pull at the same time. Pay attention also to the angle of the sleeves that the boots are in, it may sound stupid but pull with the angle. When reinstalling the plug wires, there should a audible "click" when the boot is successfully installed on the plug. Generally the new plug wires come a sheet of instructions. Don't forget to mark the wires for correct replacement if pulling more than one at a time.


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you have to replace all of your spark plug wires. there is a coil built into the top of each boot that goes over each spark plug. that's why the wires are so costly.


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What are the signs of bad spark plug and spark plug wires?

Answercarbon is formed in the spark area. improper ingnition also is an indication of a bad spark plug.Lack of power or diminished power and a miss that occurs quickly are signs of a bad plug or wire/electrical problem. The best way to check for bad spark plug wires is very easy. If you are handy with a voltmeter you can check the amount of resistance in the wire. If you are not wait till night time open the hood start the engine and look for sparks around the wires. I had a problem like this that drove me crazy as it would only occur once in a while. Visual inspections showed me nothing. Started it up one night looked under the hood and seen #3 wire was arcing through the boot on the bottom side of the plug.


Are spark plug boots the wires?

No. On "conventional" ignition systems, i.e., those with typically a single ignition coil and a distributor with distributor cap, the spark plug boot is that portion of the individual ignition wire, running to each spark plug, that terminated the ignition wire at the spark plug and provides the wire's electrical connection to the spark plug. In newer, "plug on coil" systems that do not utilize a distributor and wires, and that are characterized by having an individual ignition coil mounted atop each spark plug, the boot is that portion of the ignition coil that pushes down over and on to the spark plug. Some few designs use a replaceable boot. Most incorporate the boot into the coil assembly.


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Shorted out spark plug wire. Boot that goes down into the top of the engine onto the spark plug sometimes gets brittle and cracks causing arcing to the head and/or valve cover


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They are easy to find. Follow the spark plug wires down and pull of the spark plug boot. The plugs are right there.


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It could be caused by not getting the spark plug boot on quite right after replacing the plug wires.