How to Test the Condition of an Ignition Coil?

1 Answers
Lawson
07/29/25 6:16pm
Methods to test the condition of an ignition coil include: 1. Feel the temperature of the ignition coil casing by hand; it is normal if it feels warm, but if it is too hot to touch, it indicates an inter-turn short circuit fault in the ignition coil. 2. Measure the resistance of the primary and secondary windings with a multimeter; if the resistance is infinite, it indicates an open circuit fault in the winding. 3. Compare the spark intensity of the ignition coil being tested with that of a known good ignition coil by connecting them separately. Faults in the ignition coil can lead to: 1. No secondary voltage being generated, or the secondary voltage being too low to ignite. 2. Although sparking may occur, reduced secondary voltage results in insufficient ignition energy, causing high-speed misfires, incomplete combustion, difficulty in starting the engine, unstable idle, reduced power, increased exhaust pollution, and higher fuel consumption.
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