An ignition coil takes voltage from the battery and multiplies it to create a spark at the spark plugs, which in turn ignites the engine. Cars have been using some form of the coil ignition system for ...

From sudden misfires to rough idling, a failing ignition coil can turn your smooth Toyota drive into a frustrating experience. Knowing the signs, how to test them, and when to replace them can save ...

We may receive a commission on purchases made from links. Is your car misfiring, having trouble starting, or idling rough? Are you wondering if the problem is one of your coil packs? If you're like ...