Your Spark Plugs on a
2000+ Jeep TJ with a 4.0L Engine
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.
Champion Truck Plugs - Part #4412 (pre-gapped .035")
• 13mm Socket
• 5/8" Spark Plug Socket
• Ratchet Extensions
• Torque Wrench
• Flat Head Screwdriver
• Universal Joint Socket
• Anti-seize Compound
• Dielectric Spark Plug Boot Protector
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
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.