Diagnosis Guide Car Coil on Plug.pdf
Diagnosis Guide Car Coil on Plug.pdf
Vehicle type : ACCURA, ALFA ROMEO, AUDI, BMW, Cadillac, Ford, Mitsubishi and more. The objective of the ignition system is: 1. To create a spark hot enough to ignite the fuel mixture. 2. To time the ignition for maximum efficiency. 3. To maintain the spark for as long as there is fuel in the combustion chamber. In primary analysis, the absence of the KV spike places all the diagnostic emphasis on the firing time. This in itself is not all that bad with a system that has no plug wires, and no multiple gaps.
The Inductive kick has limited diagnostic value. The purpose of the ignition system is not only to ignite the spark in the combustion chamber at the right time, but also to maintain the firing for as long as there is fuel in the combustion chamber. Therefore, observing the firing time is the first objective! Isolate: Is problem related to a cylinder? Identify: Which cylinder or cylinders? The only safe way to kill a spark is by inhibiting coil output without shorting the current limiting.
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