Jeep TJ Spark Plug Reccomendations - JeepForum.com
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post #1 of 76 Old 04-08-2011, 09:53 PM Thread Starter
evan1395
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Jeep TJ Spark Plug Reccomendations

Ive read around on this forum and gotten TONS of different opinions on the exact type of spark plug to use in the TJ's. So far the Champion Spark Plugs seem to be the way to go for the Inline 6's. However some people swear by the E3 diamond fire spark plugs also. In the everyday Jeep owners opinion what do YOU personally reccomend for the Straight 6's. Also, the gapping is .35" correct, and they do come pre-gapped right?

Thanks,
Evan

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post #2 of 76 Old 04-08-2011, 09:59 PM
TJJP77
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This engine responds well to either standard copper/nickel plugs, or single electrode double platinum plugs, such as the autolites or champions. Chrysler switched from Champion plugs to NGK towards the end to improve cold start characteristics as well as hot restart issues, so you may want to consider the NGKs as well. I personally wouldn't waste my money on these "E3" plugs.

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post #3 of 76 Old 04-08-2011, 10:20 PM
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Champions here... They work great!
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post #4 of 76 Old 04-08-2011, 10:37 PM
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Quote:
Originally Posted by TJJP77 View Post
This engine responds well to either standard copper/nickel plugs, or single electrode double platinum plugs, such as the autolites or champions. Chrysler switched from Champion plugs to NGK towards the end to improve cold start characteristics as well as hot restart issues, so you may want to consider the NGKs as well. I personally wouldn't waste my money on these "E3" plugs.
X2 on the crap "E3's".

I personally like to call for the OEM specs. I go close as possible with autolites. I got the coppers and gaped them to .035" and she runs perfect. Don't mess with a good thing. And don't run too cold of a plug, that's just trouble,

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post #5 of 76 Old 04-08-2011, 10:41 PM
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I'm sure a new thread about the same old question will solve it for everyone....


Quote:
Originally Posted by evan1395 View Post
Ive read around on this forum and gotten TONS of different opinions on the exact type of spark plug to use in the TJ's. So far the Champion Spark Plugs seem to be the way to go for the Inline 6's. However some people swear by the E3 diamond fire spark plugs also. In the everyday Jeep owners opinion what do YOU personally reccomend for the Straight 6's. Also, the gapping is .35" correct, and they do come pre-gapped right?

Thanks,
Evan
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post #6 of 76 Old 04-08-2011, 11:22 PM
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Champion 7034's

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post #7 of 76 Old 04-08-2011, 11:28 PM
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I did a poll on this same subject and went with the Autolite app985's and they were a huge difference. The Champion 7034's are good too but I couldn't find them anywhere.
http://www.jeepforum.com/forum/f9/re...-plug-1134593/
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post #8 of 76 Old 04-09-2011, 12:05 AM
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I run Autolite APP985 double platinum plugs, also the Champion 7034 double platinums work well too. Those are the only ones other than standard copper that will work, everything else you will have issues with trust me it's been tried. The waste spark system in the wrangler while extremely reliable is very picky about the plugs you use.

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post #9 of 76 Old 04-09-2011, 06:52 AM
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If I had a choice between Champion and AUTOLITE,,,,,,,, AUTOLITE would win 100% of the time and I'm not even a FORD fan! I HATE Champion plugs! Had a significant issue with them once. In my opinion, there junk!

I'm sure that there are better quality than they were years back but,,, I will not use them.

Another great LONG LASTING Spark-plug is the AC Delco Iridium plugs. I own C5 and C6 Corvettes. They use the AC Delco Iridium plugs and they perform FANTASTIC..

Iridium doesn't PREFORM any better than any other spark plug. They just last a LOT LONGER and hold their set gap better! The best performing Spark-plug is a Copper Core Plug but,, they DO NOT last as long as a rare metal plug.

Fancy high dollar Spark-plugs don't make HP. Plugs with MULTIPLE gaps look cool but, the spark only jumps from ONE GAP at a time!!!

Spark plug wires are the same. FANCY $200 wires will NOT increase HP.. There are basically THREE types of spark plug wires used on modern engines.

Solid Core ( Not recommend,, but for all out racing applications)


Suppressive Carbon Core: (Inexpensive wires used on common platforms. High Resistance wires! )

Inductive Spiral Wound Core wires. They use Nickel Alloy Wire for the conductor that is spiral wound around a nylon or amrid core. One of the best wires made and has the lowest resistance for a stock wire. A good spiral wound wire cant be beat for performance and longevity.


There are other types of wires and most of them are hype. Stick with the spiral wound core wires with good quality silicone jackets and boots.


BC
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post #10 of 76 Old 04-09-2011, 07:17 AM
wheels082
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I like the Champion plugs in my straight 6. I would not recommend the E3 plugs.
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post #11 of 76 Old 04-09-2011, 07:54 AM
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Autolite APP985 plugs for 2000-2006'.
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post #12 of 76 Old 04-09-2011, 08:05 AM
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what is the reccomended change interval for plugs in the new c.o.p. 4.0L's?

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post #13 of 76 Old 04-09-2011, 08:08 AM
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Quote:
Originally Posted by evan1395 View Post
the gapping is .35" correct, and they do come pre-gapped right?
Thanks,
Evan
never trust the factory pre set gap on a plug. they get bounced around in shipment too much. what if your local parts monkey drops them?

its important you check your gaps!

brand and style is up to you. id use the factory champion or the autolite myself. i have had good luck with ngk also. they are all quality plugs and should perform well. the fancy multi-tip plugs are a waste of money.

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post #14 of 76 Old 04-09-2011, 08:19 AM
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Quote:
Originally Posted by joe_jeep View Post
what is the reccomended change interval for plugs in the new c.o.p. 4.0L's?
The APP985 plugs will last 100,000 miles.I change the stock plugs at 50,000.
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post #15 of 76 Old 04-09-2011, 09:12 AM
TJJP77
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Quote:
Originally Posted by BC Jeep View Post
AUTOLITE would win 100% of the time and I'm not even a FORD fan!
Not to derail the thread, but Ford hasn't owned Autolite for a long time - they were forced to sell the brand in around 1972-1973 for anti-trust reasons. Ford then re-launched the Motorcraft brand (they had used the name unsucessfully in the '50's) to replace it, which it still owns today.

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