Using a flat head screwdriver, loosen the clamp securing your air tube to your air filter box and throttle body
Detach the CCV breather hose and rotate your air tube out of the way or remove it completely for better access
Using a 13mm socket and a ratchet extension, remove the 4 bolts securing your spark coil rail to your engine
Grab the spark coil rail firmly and pull it straight out. You may have to wiggle it a bit to free it
Using a 5/8" spark plug socket, remove all 6 spark plugs from your engine
Apply some anti-seize compound to the threads of your new spark plugs
Apply some dielectric boot protector to your spark plugs and to the inside of your spark rail boots
Install your new spark plugs using your 5/8" spark plug socket and torque them to 26-30 ft. lbs.
Reattach your spark coil rail and tighten the 4 bolts to 21 ft. lbs. of torque
 
Changing Your Spark Plugs on a
2000+ Jeep TJ with a 4.0L Engine

Every 30,000 miles or as part of a routine tune-up, it is recommended that you replace all your spark plugs and wires. If you own a 2000+ Jeep TJ with a 4.0L engine, you have a distributorless ignition system and only need to replace your spark plugs. This is a very easy job and should only take about 30 min to do.

What You Need
• Champion Truck Plugs - Part #4412 (pre-gapped .035")
• 13mm Socket
• 5/8" Spark Plug Socket
• Ratchet
• Ratchet Extension
s
• Torque Wrench
• Flat Head Screwdriver
• Universal Joint Socket
• Anti-seize Compound
• Dielectric Spark Plug Boot Protector

Installation
1. Pop open your hood and using a flathead screwdriver, begin loosening (but do not remove) the hose clamps securing your air intake tube to your air cleaner box and throttle body.

2.
Detach the CCV breather hose connecting your air intake tube and valve cover. Remove your air intake tube completely or at least detach it from your air cleaner box and rotate it out of the way. This will allow you better access to your spark coil rail.

3.
Using a 13mm socket and a ratchet extension, remove the 4 bolts securing your spark coil rail to your engine.

4. Now, grab the spark coil rail firmly and carefully pull it straight out and off your spark plugs. You may have to wiggle it a bit to free it but it should eventually come off with ease. You should notice that there is a wire connected to it on the rear of spark coil rail. Make sure you do not yank this wire or damage it. Once off, simply set it in your engine compartment out of the way.

5. Using a 5/8" spark plug socket on a ratchet extension, remove the 6 spark plugs along the side of your engine. The last plug that is closest to the firewall may be a bit tough to reach and a shorter extension and/or a universal joint socket will help out a lot. It's a good idea to examine your plugs one by one as the come out and check for any fouling.

6. Open your box of Champion spark plugs and apply some anti-seize compound to the threads and dielectric spark plug boot protector to the shaft of them. The spark plugs should already be pre-gapped to .035" so they should be ready to go.

7. Carefully thread your new spark plugs onto your engine and then tighten them down to 26 - 30 ft. lbs. of torque.

8. Grab your spark coil rail and carefully install it onto your new spark plugs. Make sure that all the rubber boots on the spark coil rail are securely attached to the spark plugs. It is easy to have one or more boots miss and sit above or below the spark plugs.

9. Install the 4 coil rail mounting bolts and loosly tighten them until the base of the bolts contact the cylinder head. Then, tighten down each bolt to 20-22 ft. lbs. of torque or 250 in. lbs. of torque.

10. Reattach your air tube to your throttle body and air cleaner box. Also, reattach the CCV breather hose from your valve cover to your air tube.

That should be it. Your Jeep now has a set of new spark plugs. Please let me know if you have any other questions.






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