Removal & Installation
An individual ignition coil 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 is used to seal the coil at the opening into the cylinder head.
- 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.
- Disconnect electrical connector from coil by pushing downward on release lock on top of connector and pull connector from coil.
- Clean area at base of coil with compressed air before removal.
- Remove coil mounting nut from mounting stud.
- Carefully pull up coil from cylinder head opening with a slight twisting action.
- Remove coil from vehicle
- Using compressed air, blow out any dirt or contaminants from around top of spark plug.
- Clean coil O-ring but do not apply any lubricant.
- Position ignition coil into cylinder head opening and push onto spark plug. Do this while guiding coil base over mounting stud.
Install mounting stud nut and tighten as follows:
- 3.7L & 4.7L Engines: 70 inch lbs. (8 Nm).
- 5.7L Engines: 62 inch lbs. (7 Nm).
- Connect electrical connector to coil by snapping into position.
If necessary, install throttle body air tube or box.
- Disconnect the Ignition Coil harness connector.
- Remove the Fuel Pump Relay or ASD Relay.
- Using a 12-volt test light connected to 12-volts, probe the Ignition Coil Control circuit.
Crank the engine for 5 seconds while observing the test light. If the test light blinks or flickers brightly, verify that there is good pin to terminal contact in the Ignition Coil and the Powertrain Control Module connectors. If OK, replace the Ignition Coil in accordance with the Service Information
NOTEThe primary resistance of the 3.7L and 4.7L Ignition coil is 0.6 to 0.9 of an ohm and the resistance of a 5.7L Ignition coil is 0.558 to 0.682 of an ohm at 77°F (25°C).