Therefore, you don't need to worry about a specific wiring order for the coil pack itself to the plugs. The ECM handles the timing and firing. If you're replacing the coil pack, make sure to connect the wires to the same terminals they were previously attached to. Improperly connecting the wires to the coil pack will not necessarily cause a specific misfire pattern – it’ll likely result in a complete no-start or very rough running.
If you're having a problem, instead of focusing on the coil pack wiring order, troubleshooting steps should focus on:
* Spark: Check for spark at each spark plug using an inline spark tester.
* Fuel: Check for fuel pressure and delivery.
* ECM: A faulty ECM can cause misfires. This is a more advanced diagnosis typically requiring a scanner.
If you're working on the ignition system, always disconnect the negative battery cable before starting any work to prevent accidental shorts or shocks. Consult a wiring diagram specific to your vehicle's year and engine for the correct connections if you have any doubts about existing wiring.
