Dodge Nitro. Manual — part 791

Fig. 15: Identifying Sensor, Sensor Mounting Bolt & Engine
Courtesy of CHRYSLER LLC

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. Remove intake manifold. Refer to INSTALLATION .

2. Disconnect knock sensor pigtail harness from engine wiring harness. This connection is made near front

of engine (3).

3. Remove sensor mounting bolt (2). 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.

4. Remove sensor from engine.

INSTALLATION

INSTALLATION - 3.7L

2007 Dodge Nitro R/T

2007 ENGINE Ignition Control - Service Information - Nitro

Fig. 16: Identifying Knock Sensors, Identification Tag (LEFT) & Electrical Connector
Courtesy of CHRYSLER LLC

1. Thoroughly clean knock sensor mounting holes.

2. Install sensors (1) into cylinder block.

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 .

INSTALLATION - 4.0L

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.

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.

2007 Dodge Nitro R/T

2007 ENGINE Ignition Control - Service Information - Nitro

Fig. 17: Identifying Sensor, Sensor Mounting Bolt & Engine
Courtesy of CHRYSLER LLC

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 Torque Specifications. 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 .

SPARK PLUG

REMOVAL

SPARK PLUGS

Each individual spark plug is located under each ignition coil. Each individual ignition coil must be removed to
gain access to each spark plug. See REMOVAL.

1. Remove necessary air filter tubing at throttle body.

2. Prior to removing ignition coil, spray compressed air around coil base at cylinder head.

3. Prior to removing spark plug, spray compressed air into cylinder head opening. This will help prevent

foreign material from entering combustion chamber.

4. Remove spark plug from cylinder head using a quality socket with a rubber or foam insert. Also check

condition of ignition coil O-ring and replace as necessary.

5. Inspect spark plug condition.

2007 Dodge Nitro R/T

2007 ENGINE Ignition Control - Service Information - Nitro

INSTALLATION

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 Torque Specifications.

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.

SPARK PLUG CABLE

DESCRIPTION

DESCRIPTION

Spark plugs cables are not used with either the 3.7L or 4.0L V-6 engines.

SWITCH-IGNITION

DESCRIPTION

IGNITION SWITCH

2007 Dodge Nitro R/T

2007 ENGINE Ignition Control - Service Information - Nitro