Grand Cherokee 2006-2007

Ignition Coil Pack

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Removal & Installation



3.7L & 4.7L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Certain coils may require removal of the throttle body air intake tube or intake box for access.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Detach the electrical connector from the coil by pushing downward on the release lock on top of the connector and pulling the connector from the coil.
  8.  
  9. Clean the area at the base of each coil with compressed air.
  10.  
  11. Remove the coil mounting nut(s). Pull the coil up with a slight twisting action and remove it from the vehicle.
  12.  
  13. Installation is the reverse of removal. Smear the coil O-ring with silicone grease. Tighten the mounting nut to 70 inch lbs. (8 Nm). Connect the wiring.

    Click image to see an enlarged view

    Fig. 3.7L V6 Coil Location (1) Ignition Coil (2) Coil Mounting Nut



    Click image to see an enlarged view

    Fig. 4.7L V8 Coil Location (1) Ignition Coil (2) Coil Electrical Connector (3) Coil Mounting Stud/Nut

  14.  

5.7L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Certain coils may require removal of the throttle body air intake tube or intake box for access.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Unlock connector by first releasing slide lock and pressing on lock release while pulling connector from coil.
  8.  
  9. On 2005 models, remove secondary high-voltage wire with a twisting motion.
  10.  
  11. Loosen coil mounting bolts; the mounting bolts are retained by the coil body.
  12.  
  13. Pull the coil up.
  14.  
  15. Installation is the reverse of removal. Smear the coil O-ring with silicone grease. Tighten the mounting nut to 9 ft. lbs. (12 Nm). Connect the wiring.
    NOTE
    On 2005 models, to prevent ignition crossfire, spark plug cables MUST be placed in cable tray (routing loom) into their original position.



    Click image to see an enlarged view

    Fig. 2005 5.7L Coil location on valve cover. (1) Slide lock (2) Secondary wire (3) Lock release (4) Coil electrical connector (5) Ignition coil (6) Mounting bolts (7) Secondary wire



    Click image to see an enlarged view

    Fig. Ignition coil mounting-2006-07 models

  16.  

Testing



The coil(s) can be checked with an ohmmeter.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the coil from the engine.
  6.  
  7. Primary winding resistance (across the low tension terminals) should be 0.6-0.9 ohms.
  8.  
  9. Secondary winding resistance (across the spark plug lead and one of the low tension terminals) should be 6-9K ohms.
  10.  
  11. Replace any coil not within specification.
  12.  

 
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