Spark plugs are crucial engine components. We prepared the ultimate guide on everything you need to know about testing a spark plug.

The coil pack is a collection of ignition coils controlled by your car’s electronic ignition that transforms the power from your cars battery down to the spark plug, which of course ignites the ...

Though small, spark plugs play an important role in getting your vehicle started and keeping it running—so when they’re past their prime, you’re going to want to replace them.

For instance, Ford's Coil on Plug (CoP) system provides instant spark to the plugs for better performance and greater efficiency, however it is also a weak point for SOHC 4.6L and 5.4L V-8 engines.

AEM Performance Electronics brings sophisticated electronic engine control & coil-on-plug ignition to the 5.0L Ford.

Next, the electrical plugs are disconnected. With these two steps accomplished, gently pull the OE coil pack off of the engine--wash, rinse, repeat for the remaining coil packs.