A coil pack, simply put, is an electronically controlled pack of ignition coils controlled by the car’s computer. Its main responsibility is to build up the energy and then release the voltage through the spark plug cables so it can reach the spark plugs–and that’s how the combustion process starts. In modern cars, the distributor is replaced by this device because of two reasons:  It is more reliable and  It provides a better spark, which results in more efficient combustion and higher horsepower. HOW IGNITION DISTRIBUTOR WORKS? Download: REPAIR GUIDE FOR DENSO COMMON RAIL INJECTOR REPAIR OVERHAULING A BOSCH DISTRIBUTOR Read More: What will happen if you have a bad coil pack? Once the coil pack fails, engine misfiring can … Continue reading What Is A Coil Pack?