Ignition Coil Pack(s) TESTING ,REMOVAL and INSTALLATION?

TESTING

Primary and Secondary Circuit Tests

1. Turn the ignition switch OFF , disconnect the battery, then detach the wiring harness connector from the ignition coil to be tested.
2. Check for dirt, corrosion or damage on the terminals.

PRIMARY RESISTANCE

See Figures 1 and 2

1. Use an ohmmeter to measure the resistance between the following terminals on the ignition coil, and note the resistance:

Except 2.3L, 2.5L and 5.0L engines

B+ to Coil 1

B+ to Coil 2

B+ to Coil 3

2.3L, 2.5L and 5.0L engines

B+ to Coil 1

B+ to Coil 2

or,

B+ to Coil 3

B+ to Coil 4

The resistance between all of these terminals should have been between 0.3-1.0 ohms. If the resistance was more or less than this value, the coil should be replaced with a new one.

SECONDARY RESISTANCE

See Figures 1 and 2

Fig. Fig. 1: Engine ignition coil harness connections-3.0L and 4.0L engines

Fig. Fig. 2: Engine ignition coil harness connections-2.3L, 2.5L and 5.0L engines

1. Measure, using the ohmmeter, and note the resistance between each corresponding coil terminal and the two spark plug wire towers on the ignition coil. The coil terminals and plug wires towers are grouped as follows:

Except 2.3L, 2.5L and 5.0L engines

Terminal 3 (coil 1)-spark plugs 1 and 5

Terminal 2 (coil 3)-spark plugs 2 and 6

Terminal 1 (coil 2)-spark plugs 3 and 4

2.3L, 2.5L engines-right-hand coil pack

Terminal 1 (coil 2)-spark plugs 2 and 3

Terminal 3 (coil 1)-spark plugs 1 and 4

2.3L, 2.5L engines-left-hand coil pack

Terminal 1 (coil 4)-spark plugs 2 and 3

Terminal 3 (coil 3)-spark plugs 1 and 4

5.0L engines-right-hand coil pack

Terminal 1 (coil 2)-spark plugs 3 and 5

Terminal 3 (coil 1)-spark plugs 1 and 6

5.0L engines-left-hand coil pack

Terminal 1 (coil 4)-spark plugs 2 and 8

Terminal 3 (coil 3)-spark plugs 4 and 7

If the resistance for all of the readings was between 6,500-11,500 ohms, the ignition coils are OK. If any of the readings was less than 6,500 ohms or more than 11,500 ohms, replace the corresponding coil pack.

On 2.3L, 2.5L and 5.0L engines, if one coil pack is found to be defective, the other pack does not need to be replaced.

REMOVAL & INSTALLATION

See Figures 3 through 12

All engines, except the 2.3L, 2.5L and 5.0L engines, utilizes one coil pack containing three separate coils. The 2.3L, 2.5L and 5.0L engines use two coil packs containing two separate coils each.

Fig. Fig. 3: 1991 ignition coil mounting for the 2.3L engine

Fig. Fig. 4: 1992-99 ignition coil mounting for the 2.3L, 2.5L engine

Fig. Fig. 5: Ignition coil mounting for the 3.0L engine

Fig. Fig. 6: Ignition coil mounting for the 4.0L engine

Fig. Fig. 7: Ignition coil mounting for the 5.0L engine

1. Disconnect the negative battery cable.

Fig. Fig. 8: To remove the coil pack, unplug the electrical harness connector from it

2. Unplug the electrical harness connector from the ignition coil pack.

Fig. Fig. 9: Label the spark plug wires according to their position on the coil pack

Fig. Fig. 10: Remove the plug wires from the coil by squeezing the lock tabs (arrows) and pulling straight up

3. Label and remove the spark plug wires from the ignition coil terminal towers by squeezing the locking tabs to release the coil boot retainers.

Fig. Fig. 11: Remove the coil retaining screws ...

Fig. Fig. 12: ... then remove the coil pack from its mounting bracket

4. Remove the coil pack mounting screws and remove the coil pack.

To install:

5. Install the coil pack and the retaining screws. Tighten the retaining screws to 40-62 inch lbs. (4.5-7 Nm).

Be sure to place some dielectric compound into each spark plug boot prior to installation of the spark plug wire.

6. Attach the spark plug wires and electrical harness connector to the coil pack.
7. Connect the negative battery cable.

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