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 - Some People Like Red - by Art Willis. I was smitten, as a little boy, by red tractors. I used to play in the coastal sand of my Dad & Mom's home with little red tractors, trucks and cars. I grew up believing that like fire trucks, ALL tractors are supposed to be red! Today, the only way I would drive a John Deere is if someone would paint it RED! Driving a Tractor for the first time - About 19 years ago, when my wife Donna and I moved to what was the country then, I was given access to a large Farmall tractor by a wi
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