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Unread 09-24-2009, 06:30 PM   #1
Andymack
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Spark Plug Preferences

Installing Champion Double Platinum spark plugs tomorrow.

What brands do you guys use? Are the Bosch 4-prong platinum plugs any good?? I've heard mixed reviews.


What other electrical system mods do you recommend??

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Unread 09-24-2009, 06:34 PM   #2
ZJWally
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from what i've seen posted around here, platinums dont work well....at least for the 4.0's. I just changed with the standard 1.99 plugs and things are running good. Ive heard of bad gas mileage and misfires after installing platinums.
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Unread 09-24-2009, 06:39 PM   #3
99avant
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Get the regular champion copper truck plugs

Platinum plugs will do nothing for your 4.7
It was tuned to run on the regular copper plugs
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Unread 09-24-2009, 07:02 PM   #4
96ZjBurner
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bosch iridium FUSION there the best plug on the market. thats what i got in my truck. there beast. PERIOD.
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Unread 09-24-2009, 07:04 PM   #5
Turbonut
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As long as the current plugs are firing, no spark plug will increase the performance or fuel mileage, so stick with the factory plug. With the current ignition system, no improvement needed.
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Unread 09-24-2009, 07:52 PM   #6
dougy147
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Another vote for factory plugs.

My personal opinion is to stay away from the bosch platinum 2 and +4. I put these in my 4.0 ZJ and the thing never ran right, or up to temp. Installed some NGK and it corrected the problem. I used to work at an Advance, and I noticed that those particular plugs have very few part numbers compared to the application range. Almost like they just decided if the seat type, thread and length were OK it would work. Other plugs have many more part #'s for different heat ranges. Just my
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Unread 09-24-2009, 09:23 PM   #7
LordHobbit
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I like champion and ngk the best. If you aren't running advanced ignitions, then use regular copper. Try to stay away from Autolites, they are good plugs don't get me wrong, but they don't work so well in mopar engines.
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Unread 09-24-2009, 09:46 PM   #8
xJoshxx
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Quote:
Originally Posted by LordHobbit View Post
I like champion and ngk the best. If you aren't running advanced ignitions, then use regular copper. Try to stay away from Autolites, they are good plugs don't get me wrong, but they don't work so well in mopar engines.
mybe in your 93 but in my 00 WJ 4.0 autolite XP's i gained 2mpgs

but others were also gapped like .80
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Unread 09-24-2009, 10:37 PM   #9
wickerham
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..copper..
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Unread 09-24-2009, 10:41 PM   #10
JrMechanic
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Autolite 3923's. They are two heat ranges cooler IIRC than the factory 5224's and are well regarded in the ram/dakota world with Magnum series engines, including the 3.7 and 4.7.
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Unread 09-25-2009, 07:16 AM   #11
melloyello
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Quote:
Originally Posted by 96ZjBurner View Post
bosch iridium FUSION there the best plug on the market. thats what i got in my truck. there beast. PERIOD.
best or most expensive thing you could find?
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Unread 09-25-2009, 07:17 AM   #12
melloyello
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Quote:
Originally Posted by xJoshxx View Post
mybe in your 93 but in my 00 WJ 4.0 autolite XP's i gained 2mpgs

but others were also gapped like .80
Had nothing to do w/ the brand of plug. Gap was twice what it was supposed to be.
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Unread 09-25-2009, 08:15 AM   #13
floridajpr
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I dont think that Champion makes the truck plugs anymore. I went to their web site and they are not listed and everyone I ask says they are not producing them anymore. I went on the web just a few weeks ago and finnally found 2 boxes(12) of the Champion truck plugs but the auto parts store said that they are going to be the last as they are not making them anymore.
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Unread 09-25-2009, 09:02 AM   #14
xJoshxx
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Originally Posted by melloyello View Post
Had nothing to do w/ the brand of plug. Gap was twice what it was supposed to be.
my point exactly doesn't matter on the plug it will be better than the one u had
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Unread 09-25-2009, 10:20 AM   #15
Andymack
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I put the double plats in - they are Champion and they're practically identical to the NGKs that I pulled out of it.
They don't seem to perform any differently. A little more gradual warm-up, a little less rough on start-up, and better response when shifting so it's like riding a cloud.

Next, I'm gonna get some UpCountry suspension and a BB, then whacky exhaust.

Thanks guys, I'll let you know if these plugs are crap in a few weeks.
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