Ignition Control - Service Information: Removal & Installation Dodge Nitro I

INSTALLATION - 4.0L

1. Check condition of sensor O-ring.
2. Carefully twist sensor (2) into timing gear cover (4).
3. Install sensor mounting bolt (3). Refer to «SPECIFICATIONS»(ref-306179-S05120182152008120900000) .
4. Connect electrical connector (1) to CMP sensor.
5. Install generator. Refer to «INSTALLATION»(ref-306161-S23448537052008120900000) .

Scheme 22

Six individual ignition coils (3) are used for each of the six spark plugs.

1. Remove engine cover.
2. Disconnect negative battery cable.
3. Remove upper half of intake manifold. Refer to «REMOVAL»(ref-306142-S16054353982008120900000) - 3.7L or «REMOVAL»(ref-306143-S33795118172008120900000) - 4.0L ).
4. Unlock and disconnect electrical connector (1) from ignition coil(s)
5. Clean area at base of coil with compressed air before removal.
6. Remove coil mounting bolt (2).
7. Carefully pull up coil from cylinder head opening with a slight twisting action.
8. Remove coil from engine.

Scheme 23

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.

Scheme 24

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.

INSTALLATION - 3.7L

Note. The left sensor is identified by an identification tag (LEFT) (2). It is also identified by a larger bolt head. The Powertrain Control Module (PCM) must have and know the correct sensor left/right positions. Do not mix the sensor locations.

1. Thoroughly clean knock sensor mounting holes.
2. Install sensors (1) into cylinder block. NOTE: Over or under tightening the sensor mounting bolts will affect knock sensor performance, possibly causing improper spark control. Always use the specified torque when installing the knock sensors. The torque for the knock sensor bolt is relatively light for an 8 mm bolt. NOTE: Note foam strip on bolt threads. This foam is used only to retain the bolts to sensors for plant assembly. It is not used as a sealant. Do not apply any adhesive, sealant or thread locking compound to these bolts.
3. Install and tighten mounting bolts. Tighten to 15 +/- 2 ft.lbs. (20 N.m) (176 in.lbs).
4. Connect knock sensor wiring harness to engine harness at rear of intake manifold.
5. Install intake manifold. Refer to «INSTALLATION»(ref-306142-S30306992222008120900000) - 3.7L.

Only one sensor (1) is used with the 4.0L engine. It is attached to the top of the cylinder block below the intake manifold.

1. Position sensor (1) to engine. Install and tighten mounting bolt (2). Refer to «SPECIFICATIONS»(ref-306179-S05120182152008120900000) . Note foam strip on bolt threads. This foam is used only to retain the bolt to sensor for plant assembly. It is not used as a sealant. Do not apply any adhesive, sealant or thread locking compound to this bolt.
2. Connect knock sensor pigtail harness to engine wiring harness. This connection is made near front of engine (3).
3. Install intake manifold. Refer to «INSTALLATION»(ref-306143-S05495232132008120900000) .

INSTALLATION

Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs do not drop into the plug wells as electrodes can be damaged.

Always tighten spark plugs to the specified torque. Over tightening can cause distortion resulting in a change in the spark plug gap or a cracked porcelain insulator.

1. Start the spark plug into the cylinder head by hand to avoid cross threading.
2. Tighten spark plugs. Refer to Spark Plug in «SPECIFICATIONS»(ref-306179-S05120182152008120900000) .
3. Before installing ignition coil(s), check condition of coil O-ring and replace as necessary. To aid in coil installation, apply silicone to coil O-ring.
4. Install ignition coil(s). See «INSTALLATION»(ref-306179-S19525717352008120900000) .

1. Apply a small amount of clean diesel oil or motor oil to glow plug threads.
2. Attach a flexible tool such as a rubber hose to install glow plug into cylinder head. Tighten each plug to 14 N.m (10 ft. lbs.) (124 in. lbs.) torque.
3. Connect glow plug wiring harness (2) to all four glow plugs (1).
4. Install fuel rail and high-pressure fuel lines.
5. Connect negative battery cable.

Scheme 25

The glow plug relay (module) (1) is located in the engine compartment. It is attached to the ECM mounting bracket (2).

1. Remove pin (4).
2. Disconnect electrical connector (3) and remove relay.

The glow plug relay (module) (1) is located in the engine compartment. It is attached to the ECM mounting bracket (2).

1. Connect electrical connector (3) to relay (1).
2. Position relay to mounting bracket (2) and install pin (4).