Posts Tagged: COP Ignition Coil

How To Test a 3 or 4-wire COP Ignition Coil

The Right Way to Diagnose a 3 or 4-Wire Ignition Coil When troubleshooting ignition issues, knowing how to test a COP ignition coil (Coil-On-Plug) correctly is critical. I’ve seen plenty of DIYers, and even some pros make the mistake of assuming a coil is bad when it’s actually something else—like a wiring issue or a weak ground. That’s why I’m going to walk you through exactly how to test a 3 or 4-wire ignition coil, what the wires do, and how to avoid misdiagnosing ignition problems. Understanding 3 and 4-Wire … Read More