However, generally:
* The coil pack itself has markings: The coil pack will often have numbers or letters cast into it, indicating which cylinder each coil fires. These numbers or letters will correspond to the cylinder firing order in your vehicle's repair manual or online resource.
* The wires are usually color-coded: The wires themselves may have color codes that correspond to the cylinders. Again, a wiring diagram is crucial here, as the color codes can vary.
Why a diagram is essential: Incorrectly connecting spark plug wires will result in misfires, rough running, and potentially engine damage. Don't guess. Find the correct diagram for your specific vehicle year, make, and model, and follow it carefully. Your owner's manual or a reliable online automotive repair database (like Haynes or Chilton) should have this information.
