Dodge Nitro. Manual - part 789

Fig. 8: Ignition Coil Seal & O-Ring 
Courtesy of CHRYSLER LLC 

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. 

1. Depending on which coil is being removed, the throttle body air intake tube or intake box may need to be 

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro

  

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. 

Fig. 9: Locating Ignition Coil - 3.7L 
Courtesy of CHRYSLER LLC 

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.  

COIL-IGNITION - 4.0L 

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro

  

Fig. 10: Identifying Ignition Coil Electrical Connector, Coil Mounting Bolt & Ignition Coils 
Courtesy of CHRYSLER LLC 

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 .  

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.  

INSTALLATION 

COIL-IGNITION - 3.7L 

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro

  

Fig. 11: Ignition Coil Seal & O-Ring 
Courtesy of CHRYSLER LLC 

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

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

coil o-ring (2). 

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro