Cherokee, Grand Cherokee, 1999-2005

Ignition Coil

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An individual ignition coil 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 is used to seal the coil at the opening into the cylinder head.



Before removing or disconnecting any spark plug cables, note their original position. Remove cables one-at-a-time. To prevent ignition crossfire, spark plug cables MUST be placed in cable tray (routing loom) into their original position.
 
An individual ignition coil is used at each cylinder.
 
The coil mounts to the top of the valve cover with two bolts. 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.
 

Removal & Installation



2.5L & 4.0L Engines

NOTE
The ignition coil is an epoxy filled type. If the coil is replaced, it must be replaced with the same type.


NOTE
On the 2.5L 4-cylinder engine, the ignition coil is mounted to a bracket on side of engine (to rear of distributor).


NOTE
On the 4.0L 6-cylinder engine, the ignition coil is mounted to a bracket on side of engine (to front of distributor).

  1. Disconnect ignition coil secondary cable from ignition coil.
  2.  
  3. Disconnect engine harness connector from ignition coil.
  4.  
  5. Remove ignition coil mounting bolts (nuts are used on back side of bracket on some coils)
  6.  
  7. Remove coil from vehicle.

    Click image to see an enlarged view

    Fig. A single ignition coil is used with the 2.5L 4-cylinder engine. The coil is not oil filled. The coil windings are embedded in an epoxy compound. This provides heat and vibration resistance that allows the coil to be mounted on the engine



    Click image to see an enlarged view

    Fig. A one-piece coil rail assembly containing three individual coils is used on the 4.0L 6-cylinder engine

  8.  

To install:

  1. Install ignition coil to bracket on cylinder block with mounting bolts (and nuts if equipped) If equipped with nuts and bolts, tighten to 100 inch lbs. (11 Nm). If equipped with bolts only, tighten to 50 inch lbs. (5 Nm).
  2.  
  3. Connect engine harness connector to coil.
  4.  
  5. Connect ignition coil cable to ignition coil.
  6.  

 
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