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Old 12-08-2010, 09:13 PM   #1
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Probly time for a tuneup

I have a 2002 sport with 39,000 and I'm getting pretty bad gas Mileage so I was figuring a tune up was In order. What all does a full tune up consist of? What is a good kit to get? Etc..

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Old 12-08-2010, 09:16 PM   #2
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New plugs, new wires, new air filter.

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Old 12-08-2010, 09:21 PM   #3
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buy a turn up kit. much cheaper and usually comes with OEM stuff.
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Old 12-08-2010, 09:21 PM   #4
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Already did the air filter. It was the original snd so dusty it had dust covering the inside of the air box and all down the intake tube and in the throttle body. How would I clean out the throttle body? And how exactly do you change the plugs in a distributorless tj? I've only dealt with the distributor style and it was pretty straight forward.
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Old 12-08-2010, 09:21 PM   #5
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Any good brands?
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Old 12-08-2010, 09:22 PM   #6
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Already did the air filter. It was the original snd so dusty it had dust covering the inside of the air box and all down the intake tube and in the throttle body. How would I clean out the throttle body? And how exactly do you change the plugs in a distributorless tj? I've only dealt with the distributor style and it was pretty straight forward.
just unbolt the throttle body, spary with cleaner and brush a little then wipe clean.

you remove the coil pack, change the plugs.
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Old 12-08-2010, 09:23 PM   #7
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Any good brands?
if you just change plugs, you can just buy plugs.
but do get OEM plugs
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Old 12-08-2010, 11:33 PM   #8
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Originally Posted by daggo66
New plugs, new wires, new air filter.
Would that be true of a 99 TJ as well?
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Old 12-08-2010, 11:38 PM   #9
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Would that be true of a 99 TJ as well?
99 still had distributor cap so you would need new cap and rotor, and possibly wires.
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Old 12-08-2010, 11:44 PM   #10
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2002 has no distributor so it doesn't need or use ignition wires. It only needs spark plugs for a "tuneup". 2000 and newer engines are very fussy about the spark plugs they run on. I would run one of the following three... Autolite XP-985 (iridium), Autolite APP-985, or Champion 7034, both of which are double-tipped platinum. Any of those plugs will give you 100K miles of good performance too. A new paper element air filter like an AC-Delco is a good idea too. Make sure not to run any single-tipped platinum plugs or gimmick plugs like Splitfire. I would not run a conventional plug on any 2000 or newer engine either due to the DIS (distributorless ignition system) design they have that will go through conventional (non-platinum or non-iridium) plugs in half their normal lifespan.
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Old 12-09-2010, 02:37 AM   #11
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The engineers that designed and tested your engine probably must have known something when they called out the plugs they designed it to use - they put the brand and the part numbers right on the underhood sticker - left side, firewall.

But if they were crazy or stupid, why did you buy it in the first place?
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Old 12-13-2010, 10:33 AM   #12
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Anyone know if current plugs are already gapped or are we still having to gap plugs these days?
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Old 12-13-2010, 03:31 PM   #13
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Gap new plugs to .035. Don't us platinum plugs. NKGs work best for me.
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Old 12-13-2010, 05:32 PM   #14
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There is a write up a few post above yours on how to do it. I'm on my phone or else is post the link for you. Simple procedure.

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