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Old 01-25-2009, 10:43 AM   #1
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Tune up question

My Jeep is in need of a tune up, 48,000 miles. I bought new plugs, Champion 438 copper is what NAPA gave me for it, but I didnt get a cap, rotor or wires. Should I replace them at the same time? If so, what is recommended. I like keeping oem parts because I feel buying them "high performance parts" they advertise do no better other then a having a bigger price. Any info is greatly appreciated. Thanks

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Old 01-25-2009, 12:30 PM   #2
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your 05 has coil on plug module, no cap rotor or wires. just plugs for the tune up, fuel filter, air filter, clean the throttle body are good ideas at the same time.

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Old 01-25-2009, 12:34 PM   #3
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Oh, I did not know that. Im not much of a mechanic when it comes to this new technology. Thanks for the info. Ill pick up a fuel filter and change that while Im at it. I got a K&N air filter already and its in pretty good shape still. How do i go about cleaning the throttle body?
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Old 01-25-2009, 12:40 PM   #4
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since this is just maintenance, i say you don't have to remove it. get a can of throttle body or carb cleaner. remove the air hose on the throttle body, open the throttle plate by hand, and spray the cleaner in. a toothbrush works well to clean the carbon out, or a rag. repeat a few times till clean. you don't want to put a ton of cleaner in there, but use enough to get it clean. it will not start easily at first, use the gas pedal a little to start it and keep it running for the first few seconds.

its just a good preventative thing, when the t body gets all dirty on the 4.0 it will cause weird problems poor or no idle.

edit: or just use a shamwow on it
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Old 01-25-2009, 12:58 PM   #5
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Quote:
Originally Posted by orange05tj View Post
I got a K&N air filter already and its in pretty good shape still. How do i go about cleaning the throttle body?
Cleaning the throttle body is pretty easy. Remove the intake tube from the top of it and after starting the engine, slowly empty a can of aerosol throttle body cleaner into it while keeping the rpms up a tad by pushing on the throttle linkage. Before emptying the can, stop the engine and after opening the throttle all the way so the butterfly valve on top is open, spray the backside of it and wipe it clean with a rag. Be sure to aim part of the spray at the Idle Air Control Passage Inlet as shown in the below illustration. That port is where the engine gets all of its air at idle so it needs to be clean so the engine continues to idle smoothly.

One more thing, K&N's air filter is not what they hype it up to be. In reality, it's a very (!) poor air filter that lets in more dirt and fine particulates than any other competing air filter. I removed my K&N after discovering just how poor of an air filter it is.

And believe it or not, the TJ 4.0L engine's air intake system was designed to be totally non-restrictive (unlike many car engines) so it is already getting all the air it can consume so the K&N actually isn't giving the engine any more air than the factory air intake is capable of providing. A K&N can help SOME engines like the Ford Mustang 5.0L engine breathe better because the factory purposely installs restrictive air intakes on them but that's not the case with the Jeep TJ 4.0L engine. Really.
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Old 01-25-2009, 01:11 PM   #6
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Thanks for the info guys. Much appreciated. I put the k&n fliter in because when I ordered one for my wifes car, I got mine for 10 bucks. I havent checked it in a bit, but Ill replace it with a oem one.
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Old 01-25-2009, 01:17 PM   #7
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Just for grins, here's a chart I saved from an ISO (done very scientifically) lab test of various air filters.

The entire air filter test can be viewed at ISO 5011 Duramax Air Filter Test Report

The comment below for the chart at the very bottom is quoted verbatum from that lab test....

"In the chart (below) it's important to note the different test durations for each filter. The AC Delco filter test ran for 60 minutes before exceeding the restriction limit while the AMSOIL and K&N tests each ran for 20 and 24 minutes respectively before reaching max restriction. In 60 minutes the AC Filter accumulated 574gms of dirt and passed only 0.4gms. After only 24 minutes the K&N had accumulated 221gms of dirt but passed 7.0gms. Compared to the AC, the K&N "plugged up" nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt." (end of quote)
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Old 01-25-2009, 01:48 PM   #8
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Ive run AC Delco filters before and had good results. Our old work truck had one for the longest time. I remember the quick oil change bums saying it was perfect even after 75,000 miles. ill run out later and pick one up. I guess I got caught up in the hype because I looked cool with a k&n sticker under the hood. One thing I dont like about the K&N is they have some oil on it and you cant clean it.
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Old 01-25-2009, 05:42 PM   #9
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Join the crowd, many of us including me swallowed the K&N hype hook, line, and sinker. It wasn't long before I noticed just how grimy the inside of my air tube and throttle body had become after installing te K&N and my friends I was wheeling did too. We all stopped running K&Ns.

Check out the two layers of pre-filters (an Outerwears and a foam Unifilter pulled back to see them) I had to place over my K&N to get it to start filtering "ok" before I could find a new filter that fit my air tube. My factory air box had to be removed for my belt-driven compressor so I can no longer run the standard air filter. I'm now running a TruFlow air filter which is round like the K&N.
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Old 01-25-2009, 06:37 PM   #10
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+1 on not using k&n.


also, then you clean your throttle body, if you have the extra 10 minutes, just take it off. its 4 bolts, then disconnect the electrical connections.

that way you can really get it spotless, which im sure doesnt really matter as long as its not all gunked up, but i prefer to go all the way when i can.

also youll see a channel in it where it has a long slit. this is the channel for the idle air control. make sure you spray in there too.

another good thing about taking it all the way off is you can take off the iac also and clean that. should be 2 bolts holding that on
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Old 01-26-2009, 11:40 AM   #11
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Does anyone know how to change the fuel filter on my 2002 tj? I am getting ready to do a tune up and didn't see any external filter. I was told it is internal in the tank. Any info or ideas would help.
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Old 01-26-2009, 12:14 PM   #12
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The TJ's primary fuel filter is a lifetime filter that is inside the fuel pressure regulator that sits on top of the fuel pump... it's inside the gas tank. It was designed with enough surface area that it will never need replacement for the vast majority of us.
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Old 01-26-2009, 01:33 PM   #13
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oh yeah, i keep forgetting they did that on the later tj's, i shouldn't have suggested a fuel filter.
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Old 01-26-2009, 02:14 PM   #14
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whats a good brand of throttle body cleaner and when i clean the idle air control sensor do i just wipe it or spray the sensors too
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Old 01-26-2009, 02:16 PM   #15
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any brand is fine. just spray some where the valve seats in the throttle body.
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Old 01-26-2009, 02:17 PM   #16
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and the sensor when i unplug it doesnt need to be cleaned?
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Old 01-26-2009, 02:25 PM   #17
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if you aren't having any problem with it, don't remove it, cleaning the throttle body does a decent job of cleaning the iac valve. only if it is acting up and cleaning the throttle body doesn't help, then i'd say remove it and clean it. do not spray any tb cleaner on the connector.
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Old 01-26-2009, 02:34 PM   #18
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well not all the time but every once in a while the when i start my jeep up it sounds like its dying off slowly then it kills... then second start up its fine... only once in a while so i was wondering if maybe cleaning it will help this
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Old 01-26-2009, 02:40 PM   #19
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clean the tb first, see if it helps.

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