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