TESTING
4.2L Engine
PRIMARY WINDING RESISTANCE
Fig. Fig. 1 4.2L engine coil pack pin location and coil towers
- Turn the ignition OFF .
- Disconnect the negative battery cable.
- Disconnect the wiring harness from the ignition coil.
- Check for dirt, corrosion or damage on the terminals and repair as necessary.
- Measure coil primary resistance between ignition coil pin 4 (B+) and pins 1 (coil 1), 2 (coil 3) and 3 (coil 2).
- Resistance should be 0.3-1.0 ohms. If resistance is out of specifications, replace the coil pack. If resistance is within specifications, proceed to secondary windings testing.
- Measure coil secondary resistance between the corresponding spark plug wire towers on the coil.
- Resistance should be 12.8-13.1 kilohms. If secondary resistance is not within specification, replace the coil pack.
PRIMARY WINDING RESISTANCE
Fig. Fig. 2 Testing the primary ignition coil resistance-4.6L engine
- Turn the ignition OFF .
- Disconnect the negative battery cable.
- Disconnect the wiring harness from the ignition coil.
- Check for dirt, corrosion or damage on the terminals and repair as necessary.
- Measure coil primary resistance between ignition coil pin 2 (B+) and pins 1 (coil 2), 2 (coil 3) and 3 (coil 1).
- Resistance should be 0.3-1.0 ohms. If resistance is out of specifications, replace the coil pack. If resistance is within specifications, proceed to secondary windings testing.
Fig. Fig. 3 Testing the secondary ignition coil resistance-4.6L engine
- Measure coil secondary resistance between the corresponding spark plug wire towers on the coil.
- Resistance should be 12.8-13.1 kilohms. If secondary resistance is not within specification, replace the coil pack.
- Remove the suspect coil from the engine.
- Measure across the pins of the coil.
- Resistance should be between 4 and 10 kohms.
- If resistance is out of range, replace the coil and retest.
4.2L Engine
- Disconnect the negative battery cable.
- Disconnect the ignition coil and radio ignition interference capacitor electrical harness connectors.
- Tag the ignition wires and note their location on the coil pack before removing. Remove the ignition wires by squeezing the locking tabs to release the coil boot retainers and twisting while pulling upward.
- Remove the accelerator cable nut and bolt and remove the bracket. Position the bracket aside.
- Remove 2 ignition coil retaining nuts and 1 stud bolt and remove the ignition coil.
- If replacing the ignition coil, save the radio capacitor for installation on the new ignition coil.
To install:
- Place the ignition coil on the mounting bracket.
- Install 2 ignition coil nuts and 1 stud bolt. Tighten to 84 inch lbs. (10 Nm).
- Place the accelerator cable bracket and install the nut and bolt. Tighten to 84 inch lbs. (10 Nm).
- Install the ignition wires to their proper terminals on the ignition coil. Apply silicone dielectric compound to the ignition wire boots prior to installation.
- Connect the electrical harness connectors to the ignition coil and the radio ignition interference capacitor.
- Connect the negative battery cable.
- Road test the vehicle and check for proper engine operation.
Fig. Fig. 4 Remove the ignition wires from the coil pack by squeezing the retaining tabs and carefully lifting up
Fig. Fig. 5 Detach the connector for the coil pack
Fig. Fig. 6 Remove the four coil pack retaining screws and ...
Fig. Fig. 7 ... remove the coil pack from the bracket
Two ignition coil packs are used, one for each bank of cylinders. This procedure is for removing 1 ignition coil pack, but the procedure remains the same for either side.
- Disconnect the negative battery cable.
- Disconnect the ignition coil and radio ignition interference capacitor electrical harness connectors.
- Tag the ignition wires and note their location on the coil pack before removing. Remove the ignition wires by squeezing the locking tabs to release the coil boot retainers and twisting while pulling upward.
- Remove 4 ignition coil retaining screws and remove the ignition coil and radio capacitor.
- If replacing the ignition coil, save the radio capacitor for installation on the new ignition coil.
To install:
- Place the ignition coil and radio capacitor on the mounting bracket.
- Install 4 retaining screws and tighten to 40-61 inch lbs. (5-7 Nm).
- Install the ignition wires to their proper terminals on the ignition coil. Apply silicone dielectric compound to the ignition wire boots prior to installation.
- Connect the electrical harness connectors to the ignition coil and the radio ignition interference capacitor.
- Connect the negative battery cable.
- Road test the vehicle and check for proper engine operation.
Fig. Fig. 8 Detach the ignition coil connector(s)
Fig. Fig. 9 Remove the bolt(s) retaining the coil(s) to the engine
Fig. Fig. 10 Remove the ignition coil(s) from the cylinder head
The 5.4L and 6.8L engines have individual coils on each spark plug.
- Disconnect the negative battery cable.
- Detach the connector for the ignition coil.
- Remove the retaining screw for the ignition coil.
- Carefully grasp the ignition coil and gently remove it from the cylinder.
To install:
- Apply dielectric grease D7AZ-19A331-A or equivalent to the inside of the coil boot that sits on the spark plug.
- Gently push the coil onto the spark plug. An audible click can usually be heard.
- Tighten the retaining screw to 40-62 inch lbs. (5-7 Nm).
- Attach the connector for the ignition coil.
- Connect the negative battery cable.
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