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Old 03-01-2010, 01:48 PM   #1
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tune up questions....

i have a few questions about a tune up , im going to be doing on my new to me 98 sahara. i was wondering what kind of plugs, wires , oil and fuel filters you guys recommend. this will be my first tune up since buying the sahara 5 months ago.. i will be buying all my supplies from a local auto parts store like auto zone and not online. thanks for any input a head of time.. my jeep didnt come with a manual so i wanna make sure i get the right supplies.
Thanks again

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Old 03-01-2010, 02:05 PM   #2
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Personally, I stick with OE ignition wiring from the dealer. It costs a little more but it is worth it.

I've just had too many issues with aftermarket ignition wiring including radio noise, boots pulling off, etc. The OE ignition wiring is superb quality, it can't be beat. And if you insist on buying an aftermarket ignition wiring set, avoid like the plague those that push "Low Resistance'. Yes I know "low resistance" does sound good but there is a very sound reason for ignition wiring to have the resistance that the factory purposely adds to it (to reduce ignition noise that can be picked up by the engine computer & radio). There is an Ohm's Law (electronic theory mumbo-jumbo) reason why low resistance wiring doesn't significantly improve the voltage given to the spark plugs but suffice to say that low resistance wiring is strictly a marketing gimmic that does not (!) improve performance.

Distributor cap and rotor-wise, just ask for their premium replacment parts & insure they have brass contacts & not aluminum. Brass will outwear aluminum by a long time.

Spark plug wise, I would go with the Autolite AP985 (not APP985). That plug will last pretty darned close to 100K miles and it will run superbly that entire time. Avoid Bosch Plus 2 or Plus 4 plugs, our engines don't run well with them for very long. Also avoid the Splitfire plugs which just poor quality Snake Oil gimmick spark plugs.

Oil filter-wise, avoid Fram. I personally like the Purolator PureOne and AC-Delco Duraguard oil filters but others like Wix are good too.

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Old 03-01-2010, 02:05 PM   #3
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you will get a million different answers but when it comes to plugs and wires I would stick with stock parts. I tried replacing my champion spark plugs with Bosch platinum and it ran like crap. Stick with the stock parts for that. As far as oil and filter go use whatever brand you want, I use Mobil 1 oil with whatever filter is on sale except fram, usually mobil 1, mopar, Bosch, etc...
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Old 03-01-2010, 04:22 PM   #4
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ok , thanks guys . im calling the dealer tomorrow to order the wires.. thanks for all the input
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Old 03-01-2010, 04:30 PM   #5
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pretty sure your 98 is alot like my 2000 when it comes to fuel pumps and filters.

they are both in the tank and it's a joyis time to replace them. i wrote a small writeup on what i encountered replace an in the tank pump and filter.
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Old 03-01-2010, 07:09 PM   #6
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so the fuel filter and oil filter are in the tank? im not to sure i wanna mess around with that.. are they made to last forever or what.. it seems weird that they put them in the tank if they needed to be changed. my rig has 113000 on it, should i be worried about changing them?. im getting some spitting and sputtering and backfire before she warms up , so i figured i should do a tune up but im not to comfortable with dropping the tank .. thanks for the input again guys.
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Old 03-01-2010, 07:11 PM   #7
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The TJ's fuel filter is inside the fuel pump assembly & is so big/has so much surface area (it looks like a big cylinder shaped piece of white felt) that it is considered a lifetime part that should never need changing.
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Old 03-01-2010, 07:51 PM   #8
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alright thanks, i appreciate the great info.. i think one of these days im going to have to order a owners manual or service manual.
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Old 03-01-2010, 08:34 PM   #9
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If you PM "Atthehop" he can get you a link so you can download a FSM. He helped me out.
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Old 03-01-2010, 09:56 PM   #10
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thanks for the info rubi, i really appreciate it. you guys rock...
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Old 03-03-2010, 02:18 PM   #11
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quick question, i got my spark plug wires from the stealership today but there not marked 1-6 and theres actually 7 wires.. my question is that some seem to be the same length.. how do i know which wire goes where. jerry , can u help me out again with this one? thanks again ahead of time guys.
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Old 03-03-2010, 02:42 PM   #12
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The 7th wire (usually the shortest) goes between the coil & distributor cap's center connector. Just swap the wires one at a time & use the wire closest in length to the old one you are removing. Don't pull all the old wires at once, that often causes confusion when trying to figure out where the new wires go.
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Old 03-03-2010, 03:04 PM   #13
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Quote:
Originally Posted by Jerry Bransford View Post
The 7th wire (usually the shortest) goes between the coil & distributor cap's center connector. Just swap the wires one at a time & use the wire closest in length to the old one you are removing. Don't pull all the old wires at once, that often causes confusion when trying to figure out where the new wires go.
Quoted for emphasis
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Old 03-03-2010, 03:34 PM   #14
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alright ill give it a shot. thanks again

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