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post #1 of 16 Old 04-13-2017, 08:02 PM Thread Starter
anony
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Spark plugs

I've been installing copper plugs such as Campions into the XJ 4.0L.

Recently came across some closeouts on spark plugs for $2.55 each. Have a store credit so I thought I would add a few of the closeout items where needed.

However I know very little about different plug types and designs other than the copper plugs.

($2.55/ea)

BOSCH 4308 PLATINUM+2 - ( Platinum Lasts up to 2x longer than standard / copper plugs)

E3 SPARK PLUGS E358 (Standard / Copper )

Are these worth the additional expense?. . Copper plugs start at around $1.38 for AUTOLITE 985

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post #2 of 16 Old 04-13-2017, 08:06 PM
tmhyer
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Use normal plugs. Its a jeep

2001 XJ 3" RC lift 31x10.5x15 MT Deegans
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post #3 of 16 Old 04-13-2017, 08:53 PM Thread Starter
anony
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Quote:
Originally Posted by tmhyer View Post
Use normal plugs. Its a jeep

2001 XJ 3" RC lift 31x10.5x15 MT Deegans
What's a normal plug?

I've been installing - CHAMPION 412 {#RC12LYC}

However instead of the 412 I'm considering CHAMPION 4412 TRUCK PLUG

and others

ACDELCO 41631 Professional; Conventional
DENSO 5018 {#QJ16HRU} Copper; Patented U-Groove Design
E3 SPARK PLUGS E358

etc.
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post #4 of 16 Old 04-13-2017, 10:23 PM
dzywicki
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Use the Champions. I would have never thought it would have made a difference until I used Autolite. Was chasing a warm idle problem for weeks until I put regular champion coppers (RC12LYC) back in. I don't use anything else now.
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post #5 of 16 Old 04-13-2017, 10:42 PM
bluejunior
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Quote:
Originally Posted by anony View Post

What's a normal plug?

I've been installing - CHAMPION 412 {#RC12LYC}

However instead of the 412 I'm considering CHAMPION 4412 TRUCK PLUG

and others

ACDELCO 41631 Professional; Conventional
DENSO 5018 {#QJ16HRU} Copper; Patented U-Groove Design
E3 SPARK PLUGS E358

etc.
Stock champion coppers, the 4.0 doesn't like anything else. No idea why but it's true.

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post #6 of 16 Old 04-14-2017, 12:05 AM Thread Starter
anony
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I picked up a set of 6 Champion 4412 truck plugs for ~$8.00.


4412



412


Years ago I use to have one of those electric spark plug cleaners, used a fine abrasive sand to clean each spark plug like new. I don't see them available new on the market anymore.

Similar to this one
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post #7 of 16 Old 04-14-2017, 07:19 AM
TheBoogieman
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Autolite AP985 platinum work best in pre 2000' 4.0 engines and last 100,000 miles. Autolite APP985 double platinum work great in 2000' and up 4.0's. 16 Jeeps and I won't use anything else.

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Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
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post #8 of 16 Old 04-14-2017, 07:20 AM
TheBoogieman
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Quote:
Originally Posted by bluejunior View Post
Stock champion coppers, the 4.0 doesn't like anything else. No idea why but it's true.
Not true at all.

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Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
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post #9 of 16 Old 04-14-2017, 10:29 AM
cpttuna
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don't argue . use what you want. If you Jeep runs great, then so be it .If it runs like S - - -, then so be it.
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post #10 of 16 Old 04-14-2017, 05:05 PM Thread Starter
anony
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Turned out the suppliers currently don't have a 4412 truck plug.

I ended up getting the same Champion plug I've been using in the past.

Champion 412 (RC12LYC). Rock Auto has them for $1.38 / each plus shipping.

I found a pack of 24 for $35.37 that included free shipping.

That's almost $1.44 / each. which isn't a too bad of a price unless you comparing prices to a few years back I seem to remember plugs were going somewhere between .50 cents and a dollar each. Probably should have stocked up on the Champion 4412 or 412s.

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post #11 of 16 Old 04-15-2017, 07:42 AM
CCKen
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Here's a spark plug application chart and Chrysler tech tip.

For a 1998 4.0 I would suggest the NGK ZFR5N plugs even though the chart says differently.


.

.
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post #12 of 16 Old 04-15-2017, 05:30 PM Thread Starter
anony
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Quote:
Originally Posted by CCKen View Post

For a 1998 4.0 I would suggest the NGK ZFR5N plugs even though the chart says differently.


.
Why do you prefer the NGK over the Champion? What's the difference between the two plugs, NGK ZFR5N and Champion RC12LYC?
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post #13 of 16 Old 04-15-2017, 05:44 PM
bluejunior
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Quote:
Originally Posted by CCKen View Post
Here's a spark plug application chart and Chrysler tech tip.

For a 1998 4.0 I would suggest the NGK ZFR5N plugs even though the chart says differently.

.

.
Maybe I'll try those next. Everything I've ever put in my 01s beside the champion coppers resulted in a rougher, less consistent idle. Even the autolite platinums everyone says the coil on plug 4.0s like.

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post #14 of 16 Old 04-16-2017, 02:36 AM
Ralph77
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Unfortunately when I bought my '00 I did not research it. At the time I had a '96. Structurally shot but ran like a champ. If I could weld I would have fixed her. Anyway about 3 years ago I came across an '00 on Craigslist local to me. Went to look at it. Running but not really driveable. Impulse purchase and got her pretty cheap. So started researching fixing the issues. That is when I found out about the heads, CA Emissions, heat soak issues, misfire issues, etc. Funny thing is that as best I can tell the 0331 head is not cracked and I never have had any heat soak or misfire issues. When I got around to replacing the plugs I told myself that what ever was in there she was getting new of. Whether they were cheapo Champions or some fancy $5 a piece plug. Turned out that they were cheapo Champion RC12ECC. Which part number is now 438. I refuse to run anything else. No idea about any other plugs but figure they work for me so why mess with it. The one thing I do is every April pull and check them. Just did it. They look like they should. Might need a slight regap here and there but that is it.
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post #15 of 16 Old 04-16-2017, 04:00 AM Thread Starter
anony
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Quote:
Originally Posted by Ralph77 View Post
Unfortunately when I bought my '00 I did not research it. At the time I had a '96. Structurally shot but ran like a champ. If I could weld I would have fixed her. Anyway about 3 years ago I came across an '00 on Craigslist local to me. Went to look at it. Running but not really driveable. Impulse purchase and got her pretty cheap. So started researching fixing the issues. That is when I found out about the heads, CA Emissions, heat soak issues, misfire issues, etc. Funny thing is that as best I can tell the 0331 head is not cracked and I never have had any heat soak or misfire issues. When I got around to replacing the plugs I told myself that what ever was in there she was getting new of. Whether they were cheapo Champions or some fancy $5 a piece plug. Turned out that they were cheapo Champion RC12ECC. Which part number is now 438. I refuse to run anything else. No idea about any other plugs but figure they work for me so why mess with it. The one thing I do is every April pull and check them. Just did it. They look like they should. Might need a slight regap here and there but that is it.
I've read good feedback (post reviews) for the RC12ECC's installed in 99+. However for 99- I've read negative feedback for the RC12ECC's. Caused rough idling, switching back to RC12LYC eliminated idling problems.

In 1999 Jeep started making changes made to the intake and exhaust manifold. The intake at some point was enlarged and streamlined and the exhaust manifold went from a single manifold to a (two piece) front and rear manifold.

I can't remember off-hand, differences between Fed and Calif emissions. Calif I Know started to install dual pre-cats on the dual header downpipe.

The PCM was reprogrammed to accommodate the re-engineering of the intake and exhaust, including changes of the catalyst. Plus other changes such as to the ignition and coil.

I'm not certain but I think the RC12ECC may have been part of the changes to the intake, exhaust and ignition that first began in 1999 through 2001.
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