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Home >> Jeep >> 2005 >> Grand Cherokee 2WD V8-5.7L VIN 2 >> Repair and Diagnosis >> Powertrain Management >> Ignition System >> Ignition Coil >> Service and Repair
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Ignition Coil: Service and Repair

REMOVAL




Before removing or disconnecting any spark plug cables, note their original position. Remove cables one-at-a-time. To prevent ignition crossfire, spark plug cables MUST be placed in cable tray (routing loom) into their original position.

An individual ignition coil (1) is used at each cylinder. The coil mounts to the top of the valve cover with two bolts (2). The bottom of the coil is equipped with a rubber boot (3) to seal the spark plug to the coil. Inside each rubber boot is a spring. The spring is used for a mechanical contact between the coil and the top of the spark plug.

1. Depending on which coil is being removed, the throttle body air intake tube or intake box may need to be removed to gain access to coil.




2. Unlock electrical connector (4) by moving slide lock (1) first. Press on release lock (3) while pulling electrical connector from coil.
3. Disconnect secondary high-voltage cable (2) from coil with a twisting action.
4. Clean area at base of coil with compressed air before removal.
5. Remove two mounting bolts (6) (note that mounting bolts are retained to coil).
6. Carefully pull up coil from cylinder head opening with a slight twisting action.
7. Remove coil from vehicle.
8. Before installing spark plug cables to either the spark plugs or coils, or before installing a coil to a spark plug, apply dielectric grease to inside of boots.

INSTALLATION
1. Using compressed air, blow out any dirt or contaminants from around top of spark plug.
2. Before installing spark plug cables to either the spark plugs or coils, or before installing a coil to a spark plug, apply dielectric grease to inside of boots.
3. Position ignition coil into cylinder head opening and push onto spark plug. Twist coil into position.
4. Install 2 coil mounting bolts.
5. Connect electrical connector to coil by snapping into position.
6. Install cable to coil. To prevent ignition crossfire, spark plug cables MUST be placed in cable tray (routing loom) into their original position. Refer to Spark Plug Cable Removal for a graphic.
7. If necessary, install throttle body air tube.
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