Opinion on spark plugs? - JeepForum.com
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post #1 of 51 Old 01-04-2020, 07:46 AM Thread Starter
Rmvr53
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Opinion on spark plugs?

opening a can or worms here, but any opinions on plugs for an 2000 XJ 4.0 with 214k on it? I am considering NGK nickel plugs.

thanks
Bill

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post #2 of 51 Old 01-04-2020, 08:09 AM
CJ7-Tim
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Autolite APP-985 is the most recommended plug for the 2000 + distributor-less coil on plug 4.0L. Champion copper plugs and the NGK equivalent are also acceptable.

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“When the people find that they can vote themselves money, that will herald the end of the Republic.”

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post #3 of 51 Old 01-04-2020, 09:10 AM
car6car
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there is no need to replace spark plugs.
Old style plugs were wearing out(are they still for sale?), new ones, platinum etc, are fine.
It doesn't matter, which ones you install.

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post #4 of 51 Old 01-04-2020, 09:24 AM
CJ7-Tim
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Quote:
Originally Posted by car6car View Post
there is no need to replace spark plugs. .....
It doesn't matter, which ones you install.

Spark plug replacement is part of routine maintenance.

It does matter. I am not sure where you are doing your research, but it is common Jeeper knowledge and recommended most often to use Champion copper spark plugs, or the NGK equivalent, in the Jeep 4.0L with a distributor. Platinum plugs and any kind of gimmicky SplitFire type plugs have been shown to cause drivability issues when used in the Jeep 4.0L with a distributor.

Autolite APP-985 is the most recommended plug for the 2000 + distributor-less coil on plug 4.0L. Champion copper plugs and the NGK equivalent are also acceptable.
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post #5 of 51 Old 01-04-2020, 09:43 AM
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A can-'o-worms for sure. My '01 FSM says Champion RC12ECC copper plugs are factory original. I am sure they work just fine. However I know that waste-fire ignition systems like our XJ's use can benefit from a Platinum plug. The waste-fire system reverses the polarity between the two cylinders each coil services and that causes electrode decay. Platinum plugs were developed to resist that decay and extend the service life. Then came Double Platinum and lately Iridium. I have used Bosch Platinum in both my XJ's for almost 20 years and they run great. I use the Iridium plugs in my '05 Cobalt and '05 Sunfire. After 50k they look good as new. They are expensive but I feel they are worth it for the long service life. See this thread. https://www.jeepforum.com/forum/f9/w...plugs-1399793/ The absolute most important thing is to use a plug of the correct heat range. There are conversion charts that show interchanges between brands but be aware that there is no absolute standard for heat range.

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post #6 of 51 Old 01-04-2020, 09:44 AM
Michaelj51
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2001xj with 214500miles. Have always had dealer parts... Mopar #SP000ZFR5N. Believe these are NGK copper. Runs like a top combined mileage 17.5. See no reason to go off the reservation.

[ They were $7.44ea last time I had them changed 15000 miles ago/ 2years]
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post #7 of 51 Old 01-04-2020, 02:30 PM
car6car
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I was told long time ago by a very smart guy that as long as spark plug makes spark, it will do fine. I would buy cheapest spark plugs because I usually don't drive cars for more than 1-2 years. This is just my opinion, I can be wrong.
I have a Jaguar, it really needs at least one new spark plug because old one was smashed by piston.
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post #8 of 51 Old 01-04-2020, 04:32 PM
2oldjeeps
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ive never seen a jeep plug. just got 22mpg on the turnpike in my 147000 wj

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #9 of 51 Old 01-04-2020, 05:04 PM
watertrucker
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I put platinum plugs in the ‘96 XJ that I used to have. Right after that I got a Check Engine Light. Don’t remember the code but I talked to my son about it and he told me those were the wrong plugs. Went with Champion copper plugs and never had a problem after that.
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post #10 of 51 Old 01-04-2020, 09:28 PM
TheBoogieman
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Like CJ7-Tim said, Autolite APP-985 plugs. You can also use their XP-985 iridium plugs. I always use the APP-985 plugs in all of my 2000 and newer Jeeps and the AP-985 plugs in my 99' and older ones. I gained 2-3 mpg by replacing my badly worn out plugs on my 99'. They were worn down to almost nothing.
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Quote:
Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
03' Rubicon/Zone 4" coils with 1" spacers up front/Rancho shocks/5.13 gears-35" MTZs/Black Magic brakes.
99' XJ /4.0L-AW4/ 5.5" lift / Rancho RS5000X shocks/33" DC Extreme country MTs. Jeep #18
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post #11 of 51 Old 01-04-2020, 10:34 PM Thread Starter
Rmvr53
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One of the reasons I'm looking to change the plugs is I have the "A' "B" and "C" coil failures codes popping up. I cleaned the plug on the coil rail and it didn't change anything. So I'm going to change plugs. If its not that, what are the odds of all three coils going bad at once?
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post #12 of 51 Old 01-05-2020, 05:58 AM
cruiser54
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Put a new set of plugs in and motor on down the road.
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post #13 of 51 Old 01-05-2020, 11:02 AM
TheBoogieman
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Quote:
Originally Posted by 2oldjeeps View Post
ive never seen a jeep plug. just got 22mpg on the turnpike in my 147000 wj
Being towed with a wrecker for half the trip doesn't count.

Quote:
Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
03' Rubicon/Zone 4" coils with 1" spacers up front/Rancho shocks/5.13 gears-35" MTZs/Black Magic brakes.
99' XJ /4.0L-AW4/ 5.5" lift / Rancho RS5000X shocks/33" DC Extreme country MTs. Jeep #18
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post #14 of 51 Old 01-05-2020, 12:33 PM
car6car
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Quote:
Originally Posted by 2oldjeeps View Post
ive never seen a jeep plug. just got 22mpg on the turnpike in my 147000 wj
There is no way your Jeep is running w/o Jeep plugs from a dealership!
I used to have a Harley, i was told to use only Harley tires.

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post #15 of 51 Old 01-07-2020, 04:17 PM
Mrtoyou
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What is the recommended plug gap for 2000-2001?

If I have to explain it, you probably won't understand anyway!
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