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    daddybrian154's Avatar
    daddybrian154 Posts: 1, Reputation: 1
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    #1

    Sep 8, 2012, 10:58 PM
    Why does my truck get hot and blow spark plug wire off
    I have a 92 ford ranger a we replaced heads,gaskets,thermostat and still gets hot and it blows a spark plug wire off
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Sep 9, 2012, 04:15 AM
    Replace the radiator--phosphate scale is likely blocking passages. Refill with a 50/50 mixture of antifreeze and distilled water. Read you Owner's Manual on how to properly fill the radiator and purge air from the system.

    Extreme heat = high resistance. The resistance in the head may be so great that the electricity in the spark plug wire is trying to find a shorter path to ground. In the process, it rips the wire from the plug.
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