Here’s the latest reader question, along with my reply!
Chris asks: I’m not getting spark and have been going through the diagnosis steps. The car in question is a 2000 Honda Civic. The coil is getting signal and power to it from the ignition control module indicating the ICM is functioning properly (also referred to as the igniter). I tested the primary and secondary resistance of the coil and all those values fall in range as well. But it won’t throw a spark from the coil tower. This doesn’t make sense to me. Is it possible for a coil to pass resistance tests (indicating it’s good) but not throw a spark from the tower (indicating it’s bad)? All the videos I’ve watched, nobody incorporates both methods. Either they test the coil by seeing if it’s throwing a spark from the tower or they test it for resistance. Thanks.
My reply: I’m assuming the engine cranks and that you have full battery voltage; if so and the resistance test checks out but the coil isn’t firing, your car’s OBD II system ought to register a code for a problem with the coil if the coil is the problem. I’d also check the crankshaft/camshaft position sensor, confirm voltage supply to the coil and so on. Having a spare known good coil on hand to just swap in and see is also helpful, of course.
I will ask my mechanic friend about this and see what he has to add!
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