How to Tell if a Car Ignition Coil is Faulty?

[Bernice]

Methods to check if a car ignition coil is faulty: 1. Visual inspection—check for cracks in the insulation cover; 2. Look for any leakage of insulating materials, such as asphalt, around the ignition coil; 3. Verify whether the high-voltage damping wire can be smoothly inserted and removed from the high-voltage damping wire hole; 4. Check if the terminals of each high-voltage damping wire are properly welded; 5. Ensure the additional resistor is intact; 6. Use a multimeter in resistance mode—connect the red probe to the ignition coil terminal and the black probe to another terminal. If the multimeter needle deflects to the right, the primary coil is functional. If the needle does not move, the primary coil is open-circuited.