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Unread 07-24-2013, 05:09 PM   #1
era86
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Cherokee XJ Tune Up Parts List

Hello everyone! I'm a proud new owner of a '98 XJ Sport with 176k miles on it. I'd been reading the forums a lot in the past couple of months to get ideas and tips on how to keep this truck running as long as possible. I especially found this thread helpful since I am looking to do a fairly comprehensive tune up on my "new" Jeep:

http://www.jeepforum.com/forum/f11/x...guide-1361211/

It's dated back to 2012, so I basically wanted to share my own list of parts with anyone that wanted to do a similar tune up themselves. Pardon me if there are tons of threads like this, but Google only led me to the link above. Any suggestions, tips, critiques are welcome. Cheers!

Champion RC12ECC (438) Copper Plus Spark Plugs
Champion RC12LYC (412) Copper Plus Spark Plugs

Bosch 09284 Premium Spark Plug Wire Set

Napa Gold 1085 Oil Filter

Stant 45359 SuperStat Thermostat - 195 Degrees Fahrenheit
http://www.amazon.com/Gates-33010-Th...art/B001C99SE2

Rugged Ridge 17752.07 Air Filter

ACCEL 120330 Distributor Cap

ACCEL 130330 Distributor Rotor

I'll be adding fluids to this list as well as soon as I do more research. Any recommendations are welcome. Thanks in advanced!


Last edited by era86; 07-25-2013 at 12:39 PM..
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Unread 07-25-2013, 01:02 AM   #2
Charley3
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While tuning it, install a 205F Gates 33010 thermostat from RockAuto.com and you'll get about 2 to 3 more mpg. Mine runs 208 to 210F most of the time with this stat. I think the 205F Gant opens at 208F, if my dash temp guage is correct.
Avoid Stant and Napa brand thermostats because they open 5F colder than stated temp. So a 195F opens at 190F. Colder ruins gas mileage.

Mopar OEM 195F stat will open at 195F. So it's OK. But a Gant 205F stat is best, IMO.
Also consider replacing the precat oxygen sensor. That can improve gas mileage a lot, and power too.

Motorvav engine cleaning.

Stock Champion RC12ECC plugs

New plug wires, cap, rotor. I prefer Borg Warner brand.

New air filter. Preferably an AFE high flow dry filter in stock air box.

Better yet, an AFE "Cold" (cooler) Air Intake with dry filter. It's not really a cold air intake, but is high flow. The fact that it's not a cold air is actually good. High flow warm air helps fuel economy.

Napa Gold oil filter (made by Wix), or buy Wix oil filter (same filter) for less money.

Chevron 10-30 conventional oil (really a syn blend for a great price), Mobil 10-30 conventional, or any other oil you prefer (except Castrol or Havoline). My personal favorites are Chevron and Mobil 10-30 conventional oils, or Mobil One synthetic 5-40.

For Valvoline fans, Valvoline is made by Philips Conoco oil company. Philips Conoco owns and makes the following brands of motor oil: Valvine, Napa, Union 76, 66, and Philips oil. All are same oil, but those other brands cost less than Valvoline.
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Unread 07-25-2013, 01:40 AM   #3
Charley3
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Personally, for oils, I suggest Chevron conventional oils if you are saving money and want very good oil. It says ISOSYN on label. It's really a synthetic blend oil for price of a conventional oil. Motor oil, transmission fluid, gear oil (diff oil). Exceptionally good oil for exceptionally good prices.

I also suggest Mobil One synthetic oils, of you want the best, but they are expensive. I use Mobil One 5/40 in my engine, and their transmission fluid in my tranny, and their 75-140 in my diffs.

Of course there are other good brands too (Shell, Union 76 and the other Philips Conoco brands, Redline, Kendall, Lucas, and probably others).
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Unread 07-25-2013, 05:43 AM   #4
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Quote:
High flow warm air helps fuel economy.

Can you explain this?
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Unread 07-25-2013, 05:48 AM   #5
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Quote:
Originally Posted by Charley3 View Post
High flow warm air helps fuel economy.
This is incorrect.
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Unread 07-25-2013, 06:47 AM   #6
steiny93
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Quote:
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This is incorrect.
ditto
incorrect because warm air is less dense then cool air; less dense means fewer o2 atoms which means less power during ignition
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Unread 07-25-2013, 07:02 AM   #7
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Less power yes, but I could see where one might make the argument that fewer O2 atoms would in words lower the displacement of the engine (less oxygen would mean less fuel needed)

Power would be less...but highway MPG would probably go up.
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Unread 07-25-2013, 07:16 AM   #8
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Quote:
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Less power yes, but I could see where one might make the argument that fewer O2 atoms would in words lower the displacement of the engine (less oxygen would mean less fuel needed)

Power would be less...but highway MPG would probably go up.
It does the opposite, requiring more fuel and oxygen to get the same amount of power, meaning a drop in MPG.
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Unread 07-25-2013, 07:25 AM   #9
Holder350
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That's why I say it may give better mileage on the highway.... It only takes like 30hp to keep a vehicle running at 55mph after it gets going.

Not arguing that it helps mileage just trying to look at both sides.
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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Quote:
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You can tell the character of a person in how they treat someone who can do nothing for them.
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Unread 07-25-2013, 07:31 AM   #10
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http://www.foxnews.com/leisure/2012/...ther-here-why/

Pretty interesting points......plus unless I'm mistaken didn't GM knock around a WAI idea for a couple years?
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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Quote:
Originally Posted by Azzy View Post
You can tell the character of a person in how they treat someone who can do nothing for them.
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Unread 07-25-2013, 07:46 AM   #11
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Gas companies also release a differently refined gas during the summer, which is why gas prices tend to flex around the change of seasons, though I like how Fox makes no mention of that.
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Unread 07-25-2013, 12:43 PM   #12
era86
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As per recommendation from another thread I found in another forum, I purchased Champion RC12LYC (412) plugs. Will I have issues vs Champion RC12ECC (438)?
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Unread 07-25-2013, 02:19 PM   #13
Holder350
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I use 412s without issue

Sent from my phone
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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Quote:
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You can tell the character of a person in how they treat someone who can do nothing for them.
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Unread 07-26-2013, 10:49 PM   #14
Charley3
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A warmer engine (to a point) is more efficient. That applies to warmer engine temps and warmer air intake temps. A warmer engine runs leaner. Warmer air helps atomize gas better. Gas burns more efficiently at higher temps. For all these reasons more gas mileage results.

High flow, easy breathing intake also helps gas mileage. The high flow also increased my power.

Every economodder and hypermiler forum that I've seen agrees with that, as well as many knowledgable people at this forum. Auto makers also know this and in newer cars are doing many things to improve fuel economy, including warmer engines.

I have been making mods that have increased my XJ gas mileage substantially, and some of the mods also improved my power slightly.

I went from 15 to 22 mpg so far (from tune up and a few cheap mods) and still have a few more mods to make. After a few more mods, I will get 25 to 26 mpg with 30 x 9.5 R15 ATs. Yes, really.

See this thread: http://www.jeepforum.com/forum/f11/m...5-ats-1551782/
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Unread 07-26-2013, 10:51 PM   #15
Charley3
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Quote:
Originally Posted by era86 View Post
As per recommendation from another thread I found in another forum, I purchased Champion RC12LYC (412) plugs. Will I have issues vs Champion RC12ECC (438)?
I know the RC12ECC are great. No idea about the other plug.
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