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If this is an overhead cam engine, where the spark plugs are inserted through a tube in the valve cover, the answer is simple. There is most likely a small oil leak around the seals in the valve cover at that cylinder. Compound that with a spark plug boot that may have a slight bit of wear or expansion due to the oil and you will get a small combustion at the upper end of the spark plug, especially on hard acceleration where the ignition coil is forced to put out more voltage. Repair the oil leak, replace the wires and you should be good.

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2006-03-23 17:46:42
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Q: Why does spark plug wire from cylinder keep popping out upon acceleration?
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