Why are my spk plug boots cracked
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Why are my spk plug boots cracked

  1. #1
    Senior Member junkyard's Avatar
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    Default Why are my spk plug boots cracked

    My MSD wires that don't even have a full season on them are dry and cracked at the middle of the boot/ top of the spark plug.My headers are stock Mer Cruiser headers running water thru them. The boat started running like it was starving for fuel or mis firing really bad but intermittently ,not the hole time it was running.My water pump is working good.
    Are the plug wires getting too hot and why?
    Is this from mis fire?
    Any one know what may be causing this?
    What would be a better set of plug wires to use?
    Thanks for the help.

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  3. #2
    Cas
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    I saw the same thing years ago on a car. The problem was that the plug connection wasn't being made inside the boot so the spark had to jump to reach the plug. After awhile, the rubber on the boot broke down enough for the spark to jump to the exhaust manifold.

  4. #3
    Senior Member W.O.T's Avatar
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    I had a set crack when my motor wasnt running correctly and got too hot. Now I run those little white boots over the ends of the plug wires to protect from heat. I think their made by Taylor. That was with headers though.

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  6. #4
    Horsepower sells Engines lefty's pride's Avatar
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    are they those msd boots that flex. had the same issue we where using a product to try getting them on easer, witch killed them on the race car. i think om going to the tailor wires for the boat they did the same race car.
    "Horsepower sells Engines but torque wins races."
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  7. #5
    Senior Member Schiada 201's Avatar
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    Put some dilectric gel on them, will make a better contact.

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