Ignition Coil: Service and Repair
COIL - IGNITIONREMOVAL [3.7L]
An individual ignition coil (1) is used for each spark plug. The coil fits into machined holes in the cylinder head. A mounting stud/nut secures each coil to the top of the intake manifold. The bottom of the coil is equipped with a rubber boot 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. These rubber boots and springs are a permanent part of the coil and are not serviced separately. An o-ring (2) is used to seal the coil at the opening into the cylinder head.
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. Disconnect electrical connector from coil by pushing downward on release lock on top of connector and pull connector from coil.
3. Clean area at base of coil with compressed air before removal.
4. Remove coil mounting nut (2) from mounting stud.
5. Carefully pull up coil from cylinder head opening with a slight twisting action.
6. Remove coil from vehicle.
REMOVAL-4/LV-8
An individual ignition coil (1) is used for each pair of spark plugs. Each coil attaches directly to the top of the eight upper bank of spark plugs. Secondary cables (3) connect each coil to the eight lower bank of spark plugs. The coils themselves fit into machined holes in the cylinder head. Each coil also has its own individual electrical connector (2). Note: The bolt used to mount the ignition coil is also the same bolt used to mount the intake manifold. If replacing either one, or, all eight coils, check and re-torque all eight bolts.
A mounting bolt (3) secures each coil to the top of the intake manifold. The bottom of the coil is equipped with a rubber boot (4) to seal the spark plug (5) 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 upper bank of spark plugs. These rubber boots and springs are a permanent part of the coil and are not serviced separately. The rubber boot (4) is also used to seal the coil at the opening into the cylinder head.
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. Disconnect electrical connector (2) from coil by pushing downward on release lock on top of connector and pull connector from coil.
3. Disconnect secondary cable (3) at coil.
4. Clean area at base of coil with compressed air before removal.
5. Remove coil mounting bolt (3).
6. Carefully pull up coil assembly (2) from cylinder head opening with a slight twisting action. This will help to disengage rubber boot (4) from spark plug (5).
7. Remove coil from engine.
INSTALLATION [3.7L]
1. Using compressed air, blow out any dirt or contaminants from around top of spark plug.
2. Check condition of coil o-ring (2) and replace as necessary. To aid in coil installation, apply silicone to coil o-ring (2).
3. Position ignition coil (1) into cylinder head opening and push onto spark plug. Do this while guiding coil base over mounting stud.
4. Install coil mounting stud nut (2). Tighten to 8 Nm (70 in. lbs).
5. Connect electrical connector to coil by snapping into position.
6. If necessary, install throttle body air tube.
INSTALLATION - 4.7L V-8
1. Using compressed air, blow out any dirt or contaminants from around top of spark plug.
2. Check condition of coil rubber boot (4). To aid in coil installation, apply proper silicone based grease into spark plug end of rubber boot (4). Also apply this grease to the top of spark plug (5).
3. Position ignition coil into cylinder head opening and using a twisting action, push onto spark plug.
4. Tighten coil mounting bolt (3) to 12 Nm (106 in. lbs.) torque. Note: The bolt used to mount the ignition coil is also the same bolt used to mount the intake manifold. If replacing either one, or, all eight coils, check and re-torque all eight bolts.
5. Connect electrical connector (2) to coil by snapping into position.
6. Connect secondary cable (3) to coil (1).
7. If necessary, install throttle body air intake tube, or intake air box.