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dually2, ASE Certified Technician
Category: Jeep
Satisfied Customers: 651
Experience:  ASE master certified,worked for the Dodge,Chrysler,Jeep line for 25 yrs
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2002 jeep grand cherokee: it to change spark plugs

Resolved Question:

How hard is it to change spark plugs in a 2002 jeep grand cherokee . Is there any thing special i need to do . The engine is a 4.0 liter with select tracXXXXX.
Submitted: 8 years ago.
Category: Jeep
Expert:  dually2 replied 8 years ago.

Hi,just remove the coil rail,and plugs visible.

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Expert:  dually2 replied 8 years ago.


A one-piece coil rail assembly containing three individual coils is used on the 4.0L engine (Ignition Coil Assembly-4.0L 6-Cylinder Engine). The coil rail must be replaced as one assembly. The bottom of the coil is equipped with 6 individual rubber boots (Ignition Coil Assembly-4.0L 6-Cylinder Engine) to seal the 6 spark plugs to the coil. Inside each rubber boot is a spring. The spring is used for an electrical 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.

  1. Disconnect negative battery cable at battery.
  2. The coil is bolted directly to the cylinder head. Remove 4 coil mounting bolts (Ignition Coil Rail Location-4.0L 6-Cylinder Engine).
  3. Carefully pry up coil assembly from spark plugs. Do this by prying alternately at each end of coil until rubber boots have disengaged from all spark plugs. If boots will not release from spark plugs, use a commercially available spark plug boot removal tool. Twist and loosen a few boots from a few spark plugs to help remove coil.
  4. After coil has cleared spark plugs, position coil for access to primary electrical connector. Disconnect connector from coil by pushing slide tab outwards to right side of vehicle (Ignition Coil Electrical Connector-4.0L 6-Cylinder Engine ). After slide tab has been positioned outwards, push in on secondary release lock (Ignition Coil Electrical Connector-4.0L 6-Cylinder Engine ) on side of connector and pull connector from coil.
  5. Remove coil from vehicle.