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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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