The actual firing voltage needed to create a spark across a spark plug's electrode gap depends on the width of the gap, the electrical resistance in the spark plug and plug wires, the air/fuel mixture, the load on the engine and the temperature of the spark plug. It steps up the ignition system's primary voltage from 12 volts up to thousands of volts. The ignition coil serves as a high voltage transformer. On other DIS and coil-on-plug (COP) ignition systems, each cylinder or spark plug has its own individual coil. On "waste spark" systems, each pair of cylinders shares a coil. On distributorless ignition systems (DIS), multiple ignition coils are used. Most engines that have a distributor ignition system have a single coil, but a few import applications have two coils. Ignition coils provide the high voltage needed by the ignition system to fire the spark plugs. How to Diagnose and Test an Ignition Coil by Larry Carley copyright 2019 How to Diagnose and Test an Ignition CoilĪuto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Index
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