Automotive Ignition System
Ignition Coil Diagnosis and Testing
February 18, 2011
Ignition coils provide the high voltage needed by the ignition system to fire the spark plugs. Most engines that have a distributor ignition system have a single coil, but a few import applications have two coils. On distributorless ignition systems (DIS), multiple ignition coils are used. On "waste spark" systems, each pair of cylinders shares a coil. On other DIS and coil-on-plug (COP) ignition systems, each cylinder or spark plug has its own individual coil. Fig 1. Ignition coil cutaway...
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Multi-Coil Ignition Systems
February 18, 2011
by Larry Carley Distributorless Ignition Systems (DIS) have been around for more than two decades, but in recent years the trend has been to multi-coil systems such as Coil On Plug (COP) or Coil Per Cylinder (CPC) ignition systems, and Coil Near Plug (CNP) ignition systems. Multi-Coil Ignition Systems COP systems have become the hot setup for a number of packaging, performance, emissions and maintenance reasons. Placing individual ignition coils directly over each spark plug eliminates ...
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Coil-On-Plug (COP) Ignition System
February 18, 2011
First it was the distributor that vanished. Now plug wires are starting to disappear. What is next, the spark plugs? The answer is yes, but that will not happen until direct fuel injection systems that combine the injector and spark plug into one assembly start appearing in a few years. In the meantime, you will have to learn how to diagnose and repair the current generation of coil-on-plug (COP) ignition systems. Spark plugs wires are going away for the same reason that distributors went awa...
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