Another answer in addition to johns is that 90 % of plugs that fail fail with a short. The voltage travels either through a whisker of conductive trash between the electrodes, or down the side of the center electrode through condictive deposits to the shell. Not firing does not mean not getting voltage, nor does it mean that the plug is "open". Modern Fuel is so much cleaner than leaded garbage we tollerated for 3/4 century that plugsnow last 100,000 miles instead of 7500. They still foul in an oil burning tractor, but even then less than before. Jim
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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