New Spark Plugs - JeepForum.com
 
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post #1 of 11 Old 10-31-2016, 03:25 PM Thread Starter
RandyTJ
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New Spark Plugs

Just hitting 50,000 miles on my LJ, still has original spark plugs and heading on a little trip to Tenn.


Thought it was about time to stick in some new plugs........went with Champion 7034 Double Platinum.
Have also read good things about Autolite App985, but the local parts store was out of them.

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post #2 of 11 Old 10-31-2016, 03:33 PM
Jerry Bransford
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Great choice, that plug should perform well for 100k miles. The other great choice not mentioned is the Autolite XP-985 which is iridium tipped that is good for more like 200k miles.

When you have a choice, buy American made.
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post #3 of 11 Old 10-31-2016, 05:45 PM
joe_jeep
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I did the xp985s in my lj.
They work well.
But i had 117k on the factory plugs.
They still worked good.

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post #4 of 11 Old 10-31-2016, 10:34 PM
Sudcalifornio
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Is it true the inline 6 works better with cooper than platinum sparkplugs? should I believe?

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post #5 of 11 Old 10-31-2016, 11:50 PM
Knuckelhead
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No... IMO
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post #6 of 11 Old 11-01-2016, 12:09 AM
TheBoogieman
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Quote:
Originally Posted by sudcalifornio View Post
is it true the inline 6 works better with cooper than platinum sparkplugs? Should i believe?
NO x 2.

Quote:
Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
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post #7 of 11 Old 11-01-2016, 12:38 AM
Jerry Bransford
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Quote:
Originally Posted by Sudcalifornio View Post
Is it true the inline 6 works better with cooper than platinum sparkplugs? should I believe?
No. While some ill-informed types believe that, it's not true at all.

Platinum and iridium plugs still have the solid copper core connection between the top connector and center electrode at the bottom. The electrodes are just coated with thin layers of platinum or iridium to resist erosion which allows them to last significantly longer. Like wearing shoes instead of going barefoot. Even conventional plugs usually have nickel plating on the electrodes, it just doesn't last as long.

When you have a choice, buy American made.
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post #8 of 11 Old 11-01-2016, 01:00 PM
joe_jeep
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Quote:
Originally Posted by Sudcalifornio View Post
Is it true the inline 6 works better with cooper than platinum sparkplugs? should I believe?
no!
really most correct plug numbers would work.
most of us are looking at how long they will last.
i doubt i will ever have to change plugs again on my lj.

glfwda #6624
2005 rubicon sahara lj #592
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post #9 of 11 Old 11-01-2016, 01:47 PM
1longcj
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They sure like to preach the copper plugs for the 4.7 on the WJ side of this site.
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post #10 of 11 Old 11-01-2016, 01:53 PM
Jerry Bransford
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Quote:
Originally Posted by 1longcj View Post
They sure like to preach the copper plugs for the 4.7 on the WJ side of this site.
The reason isn't stupidity, it is simple ignorance of plug technology and how to match it to the type of ignition system being used.

For example, single-tipped platinum plugs don't work well with distributorless 4.0L engines but they work perfectly well with the coil-on-plug design of the 4.7L V8 engine used in some Grand Cherokees.

When you have a choice, buy American made.
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post #11 of 11 Old 11-01-2016, 07:40 PM
btn
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An interesting note of how the distributorless TJ 4.0s work: There are three coils, one for two plugs. Each coil fires both plugs at the same time, whether the piston is on the power stroke or the exhaust stroke for that particular cylinder. The spark current always flows through one plug and in through the second plug. One plug always has the current firing from the side electrode to the center elecrode, while its paired plug has the current flowing from the center elecrode to the side elecrode. That's why both electrodes have to match in whether they're platinum tipped or not. So that they match electrically.

One time I accidentally put in single platinum plugs (I think the plug boxes were labeled as double Platinums). Three plugs ended up wearing their gaps to double their original setting while three plugs were still at the original gap due to the current flow direction disparity.

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