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#2470168 - 12/22/11 11:35 AM Favorite Spark Plugs For 2000 Jeep Cherokee 4.0
crazyoildude Offline


Registered: 07/23/08
Posts: 5269
Loc: new jersey
which plug is everyones favorite for the jeep 4.0 strait six and why?

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#2470184 - 12/22/11 11:47 AM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
Maximus1966 Offline


Registered: 11/01/10
Posts: 438
Loc: USA
I doubt you are going to be able to tell much difference whatever the brand. In my old 258 and in my 4.0 I used Champion, NGK & Autolite, all with no complaint.

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#2470211 - 12/22/11 12:23 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
Spazdog Offline


Registered: 09/06/10
Posts: 5492
Loc: Arlington
If you can still find them:


I don't know anybody who didn't love these in a Jeep 4.0 and if there is a group of Champion truck plug in Jeep 4.0 haters, they are few and far between.
_________________________
2005 Mazda 6S hatchback - Mobil Super 5000 5W20
2005 Chrysler PT Cruiser GT - QSUD 5W30

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#2470228 - 12/22/11 12:43 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
84zmyfavorite Offline


Registered: 07/14/10
Posts: 647
Loc: Wenatchee, W.A.
Yes, Yes... I Love threads about Jeep Cherokees. Just LOVE Em! I currently have 6 XJs, four of which have the 4.0, my 87 with the AW4 auto with original everything that has 293,3?? miles, my 96 with the AX-15 5 speed that I just rebuilt and put a new clutch in front of that drives but shifts hard due to a worn out and leaking Master/Slave cylinder combo that has 248,7?? miles, my 99 2 wheel drive whose 4.0 I reBuilt(Heavily ported cylinder head, .020 milled, 6 New Sealed Power pistons, Hastings Cast rings) this summer with 140,8?? miles with the AW4 auto 2 wheel drive version(Fast Jeep), and my Beloved SilverStone Metallic 2001 with 64,6?? miles that runs and drives sooo smooth. My Favorite spark plugs are Plain Jane AutoLites(925 I believe). I have used Champion Truck plugs with good luck, my friend didnt have so good luck with those in his 88 XJ. I have used Champion Platinum, Factory Champion, AutoLite Iridium, and AutoLite Platinum plugs All with Good Luck and performance. But I am partial to the Orange box Autolite plugs, just because I believe Jeeps dont like to be pampered with to much High Zoot componentry. Your 2000 will have Coil-On-Plug, which makes it a bit more time consuming to change plugs, not to mention you can damage the coil pack if it gets smacked around or dropped, so I would recommend those Champion Truck plugs as well or AutoLite Iridiums for longer service life and less frequent change. I like to stay away from Japanese plugs for my American made Jeeps. Japanese just dosent seem right in a Bad A$$ American vehicle, though the transmissions, regardless of Auto or Manual are Japanese...Except for the 87-89 XJs with the Peugot BA10/5 5 speed, and the ULTRA rare 2000 and 2001 XJs with manual tranns that have NV3550 5 speeds...Ive only seen two of these in 6 years of searching.

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#2470234 - 12/22/11 12:53 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
84zmyfavorite Offline


Registered: 07/14/10
Posts: 647
Loc: Wenatchee, W.A.
I also believe 4.0s work best with Conventional motor oils, 10w-30 regardless of temp in low mileage, GutNtight 4.0s, and a 40 weight in Higher Mileage, worn 4.0s. My 87 has Havoline 10w-40 in its sump, my 96 has Napa 15w-40 in its sump with a Oversize Purolator 30001 oil filter, my 99 has Pennzoil 10w-30 Conventional in its sump with a Fram Tough Guard TG8 oversize oil filter, and my 01 has Quaker State 10w-40 in its sump with a Plain Jane Fram Orange PH8 Oversize oil filter. They ALL run and sound very good with the best fuel mileage going to the 87 and 99. My 87, with its 293,3?? mileage everything gets proabably the best mileage of them all, and is such a Healthy motor, oil dosent turn even dark brown until 5,000 miles or later, no burning, just a little leaking from a oil Oil pressure sending unit.

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#2470241 - 12/22/11 12:58 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
Corvette Owner Offline


Registered: 01/22/03
Posts: 1577
Loc: Waldorf, Maryland
From my experience, iridium is the best (and most costly) choice in spark plugs. I took a set out of my daughter's Chevy Malibu after 105,000 miles, they looked NEW ! That convinced me !

I tend to choose Bosch.


Edited by Corvette Owner (12/22/11 12:59 PM)
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#2470274 - 12/22/11 01:38 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: Corvette Owner]
jeepman3071 Offline


Registered: 04/15/10
Posts: 1667
Loc: Storrs, Connecticut
Originally Posted By: Corvette Owner
From my experience, iridium is the best (and most costly) choice in spark plugs. I took a set out of my daughter's Chevy Malibu after 105,000 miles, they looked NEW ! That convinced me !

I tend to choose Bosch.


While a good choice for a newer engine these aren't the best for an old tractor-like in design I-6. Use Champion coppers or NGK coppers. My 2000 has a sticker on the firewall of the engine bay that says Champion RC12ECC spark plugs are recommended. thumbsup
_________________________
2000 Jeep Cherokee Sport 4.0L (146k) - PYB 10w40, Wix 51085, Magnefine trans filter

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#2470285 - 12/22/11 01:44 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
KCJeep Offline


Registered: 06/30/11
Posts: 4504
Loc: Mahzurrah!
Yep, plain old Champion copper plugs are the way to go... unless you can find those truck plugs.
_________________________
2004 Jeep Grand Cherokee 4.0 @ 121k Pennzoil HM 10w30
Napa Silver 31515
KIA Sedona 38k, Chevy Lumina 171k, Chrysler Sebring 171k, Ford Ranger 175k!

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#2470432 - 12/22/11 04:41 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
MNgopher Offline


Registered: 09/17/02
Posts: 2936
Loc: Lakeville, MN
Champion Coppers are the general choice in the 4.0 in the Cherokee, though I believe some of the later ones with COP went to NGKs as factory. Wish the truck plugs were still around - they were my favorites. Not a big deal to replace them every 30k either on this old school engine.

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#2470576 - 12/22/11 08:07 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: MNgopher]
crazyoildude Offline


Registered: 07/23/08
Posts: 5269
Loc: new jersey
i just purchased champion double platinum power premium spark plugs #7034 anyone care to comment before i install them?

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#2470584 - 12/22/11 08:19 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
Clevy Online   happy


Registered: 11/11/10
Posts: 7100
Loc: Saskatoon canada
Don't waste your money on those platinum,iridium,bullcrapitum plugs. Stick with cheap copper plugs and change them every 25000 miles.
As far as plugs go more expensive isn't better. Those platinum,iridium,4 ground strap,split fires can create a misfire because the electrodes get extremely hot and may combust the fuel before the plug fires,then detonation.
I saw a guy at the track use the iridium plugs and it caused a nitrous backfire that blew the hood of his mustang.
There are goods that are worth the added expense. This isn't one of them.
_________________________
2006 Charger RT
Miles x 2 per oil filter

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#2470585 - 12/22/11 08:20 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
Clevy Online   happy


Registered: 11/11/10
Posts: 7100
Loc: Saskatoon canada
Originally Posted By: crazyoildude
i just purchased champion double platinum power premium spark plugs #7034 anyone care to comment before i install them?

Wasted your money.
_________________________
2006 Charger RT
Miles x 2 per oil filter

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#2470650 - 12/22/11 09:15 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
91344George Offline


Registered: 11/23/11
Posts: 1082
Loc: CA
Originally Posted By: crazyoildude
i just purchased champion double platinum power premium spark plugs #7034 anyone care to comment before i install them?


The benefit of long wear metals like platinum is that you won't have to replace or adjust them for over 90k.

It my opinion it is a fair trade off. Put a little grain of rice of silver anti seize on the threads install and forget about them until 90k.

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#2470764 - 12/22/11 11:52 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
tomcat27 Offline


Registered: 06/25/09
Posts: 2469
Loc: Midwest
Champions. either copper or platinum. I prefer plats....

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#2471232 - 12/23/11 03:26 PM Re: Favorite Spark Plugs For 2000 Jeep Cherokee 4.0 [Re: crazyoildude]
hsd Offline


Registered: 09/05/09
Posts: 218
Loc: NE
I run Autolite AP 985(single platinum)in my I6 Jeep. Last set was changed at 54k and could have gone a little longer.

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