Just to add one more tid bit to the correct answers......When the coil fires the voltage IS NOT instantaneously at say 10,000 volts, it begins to ramp up until its high enough so current can arc jump the open NON conductive plug gap HOWEVER if theres a conductive path due to oil or carbon (fouling) the coil starts to conduct current and thus expends its energy and never rises up to the high voltage to arc the gap. When you introduce that added extra gap current cant flow through the oil/carbon so the voltage does rise until POW it fires the plug.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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