An ignition coil is a transformer that converts the battery’s 12 volts to the hundreds of volts wanted to create a spark on the spark plugs. If the ignition coil is unhealthy, the engine is not going to begin or will run poorly. There are a number of methods to inform if an ignition coil is unhealthy.
One technique to inform if an ignition coil is unhealthy is to search for signs resembling:
