The coil is actually a step-up transformer with primary and secondary windings (coils). You can test it an ohm meter... in cap coils have test on side of cap under the cap (take off cap). Set to the 0-2M ohm scale and compare readings for the ... more

An ignition coil can be OHM checked with a meter to see if it is out of range or if it has a completely open circuit. But what if the car seems to run fine and a misfire code is directing you to a particular cylinder? For instance if you have a code ... more