Ignition coil-3.9/5.2/5.9L engines. Ignition coil-4.7L engine

Ignition coil-3.9/5.2/5.9L engines

The ignition coil is an epoxy filled type. If the coil is replaced, it must be replaced with the same type.

REMOVA

The coil is mounted to a bracket that is bolted to the front of the right engine cylinder head (Fig. 24).

This bracket is mounted on top of the automatic belt tensioner bracket using common bolts.

(1) Disconnect the primary wiring from the ignition coil.

(2) Disconnect the secondary spark plug cable from the ignition coil.

Fig. 24 Ignition Coil-3.9L V-6 or 5.2/5.9L V-8 Engines

1 - ACCESSORY DRIVE BELT TENSIONER

2 - COIL CONNECTOR

3 - IGNITION COIL

4 - COIL MOUNTING BOLTS

WARNING: DO NOT REMOVE THE COIL MOUNTING BRACKET-TO-CYLINDER HEAD MOUNTING BOLTS.

THE COIL MOUNTING BRACKET IS UNDER ACCESSORY DRIVE BELT TENSION. IF THIS BRACKET IS TO BE REMOVED FOR ANY REASON, ALL BELT TENSION MUST FIRST BE RELIEVED. REFER TO THE BELT SECTION OF GROUP 7, COOLING SYSTEM.

(3) Remove ignition coil from coil mounting bracket (two bolts).

INSTALLATION

(1) Install the ignition coil to coil bracket. If nuts and bolts are used to secure coil to coil bracket, tighten to 11 N*m (100 in. lbs.) torque. If the coil mounting bracket has been tapped for coil mounting bolts, tighten bolts to 5 N*m (50 in. lbs.) torque.

(2) Connect all wiring to ignition coil.

Ignition coil-4.7L engine

REMOVAL

An individual ignition coil is used for each spark plug (Fig. 25). The coil fits into machined holes in the cylinder head. A mounting stud/nut secures each coil to the top of the intake manifold (Fig. 26). 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 (Fig. 25) 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 (Fig. 26) 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 from mounting stud (Fig. 26).

(5) Carefully pull up coil from cylinder head opening with a slight twisting action.

(6) Remove coil from vehicle.

Fig. 25 Ignition Coil-4.7L V-8 Engine

1 - O-RING

2 - IGNITION COIL

3 - ELECTRICAL CONNECTOR

INSTALLATION

(1) Using compressed air, blow out any dirt or contaminants from around top of spark plug.

(2) Check condition of coil o-ring and replace as necessary. To aid in coil installation, apply silicone to coil o-ring.

(3) Position ignition coil into cylinder head opening and push onto spark plug. Do this while guiding coil base over mounting stud.

(4) Install mounting stud nut and tighten to 8 N*m (70 in. lbs.) torque.

(5) Connect electrical connector to coil by snapping into position.

(6) If necessary, install throttle body air tube or box.

Fig. 26 Ignition Coil Location-4.7L V-8 Engine

1 - IGNITION COIL

2 - COIL ELECTRICAL CONNECTOR

3 - COIL MOUNTING STUD/NUT