Pulling the wire off a bit, dramatically raises the resistance between the coil output and ground. As a coil discharges, voltage increases when resistance increases,,,,, you are making the coil put out much higher voltage. And this higher voltage is enough to properly make the plug fire. SO>>>>> this usually means the spark plug is either fouled up, partially open/ separated inside the ceramic, or has some other defect. Either way, it means the plug is not firing normally, sometimes even due to high compression, as high compression requires a better plug, to fire correctly. Usually... a new plug will fix this. Usually... If plug is fouling out due to oil or other, a new plug will quickly foul again as well. I have also seen this happen where a head gasket was leaking moisture into the cyl, and the increase spark would make the plug fire correctly or enough to fire off the cyl... again making a "fouled plug" fire. Either way, your raising the voltage to fix a problem or various problems.
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Today's Featured Article - Little "M" - by Donnie Anderson. They call me "Little M" and this is my story. For the past several years I have sat against the tree-line, where my parts have rusted and rotted away. For all of these years I have wondered just exactly what happens to old tractors? Times were not always like this. I can remember back to 1948 when I was a brand new John Deere Model M. A man and his wife came to the dealer and looked me over real good. After many talks with the salesman a deal was struck and I, along with a M2 plow, c
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