Coil one fires cylinders 1 and 4, coil two fires cylinders 2 and 3. Each coil tower is labeled with the number of the corresponding cylinder.Primary Coil Resistance Test
See Figures 1 and 2
- Unplug the electrical connector from the ignition coil pack.
- Measure the primary resistance of each coil. At the coil, connect an ohmmeter between the B+ pin and the pin corresponding to the cylinders in question.
- The resistance on the primary side of each coil should be 0.45-0.65 ohms. Replace the coil if not within specifications.
See Figures 3 and 4
- Disconnect the spark plug wires from the secondary towers of the ignition coil.
- Use an ohmmeter to measure the secondary resistance of the coil between towers 1 and 4, then between towers 2 and 3.
- The secondary resistance should be 5,000-14,000 ohms. If resistance is not within specifications, the coil must be replaced.
REMOVAL & INSTALLATION
See Figures 5, 6, 7, 8, 9 and 10
- Disconnect the negative battery cable.
- Tag and unplug the spark plug wires from the ignition coil.
- Detach the electrical connector from the ignition coil.
- Remove the ignition coil mounting nuts, then remove the ignition coil pack from the vehicle.
- Install the ignition coil pack and secure with the mounting nuts.
- Attach the electrical connector to the ignition coil.
- Connect the spark plug wires to the coil, as tagged during removal. Make sure the wires are installed correctly and that the cables snap onto the towers.
- Connect the negative battery cable.