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Old 08-15-2009, 03:24 AM   #1
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'04 TJ Plugs and Wires

Since the value of my TJ has gone down I'm going to be keeping it til one of us dies...

She's got 82k on the odo and my gas mileage has dropped a couple MPG the last couple weeks so I'm doing a standard tune up. I run mobil 1 oil and K&N filters and I just cleaned the AEM Brute force on it. Now I'm going to do plugs and wires. This is where my noobness comes in.

What is the required torque on the plugs for this application? Also, why is it that there are no aftermarket wires for the 2004 4.0L engine?

I searched this topic and this is the best thread I could find.

97 tj owner maintenance

So does the Mopar or nothing still apply for a jeep that is 7 years newer?

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Old 08-15-2009, 04:55 AM   #2
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It has no plug wires, it uses a coil rail above above the plugs. Plug torque is 26-30 ft lbs.

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Old 08-15-2009, 09:32 AM   #3
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Alright, now that we are on the subject. What do you guys recommend to be the best plugs and what gap. 01' wrangler I6 4.0
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Old 08-15-2009, 09:34 AM   #4
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No need to actully torque the spark plugs if you use nothing bigger than a 3/8" drive to tighten them. Good & snug with a 3/8" ratchet wrench is fine. Just don't try that with a 1/2" drive.

Make sure that if you want to install platinum plugs which have about a 100K mile life, to ONLY use dual-tipped platinum plugs like an Autolite APP985 (NOT the AP985) or Champion 7034. Any conventional non-platinum plug is fine too though they only get 1/3 the life. Avoid the Plus2 and Plus4 plugs from Bosch, our engines don't run well with them.

Gap is .035 but most plugs appropriate for our Jeep engines already come pre-gapped to that.
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Old 08-15-2009, 11:05 AM   #5
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Thanks again for coming through for me guys.

Now it's back out to the garage.
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Old 08-20-2009, 11:24 AM   #6
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Hi....I am a new owner of a 2001 jeep wrangler with 112,655 miles. I recently repalce the spark plugs with iridium ones from Bosch and the engine doens't like that (the check engine light came on). To my limited understanding, iridium spark plugs are the best out there. So I then replace them with Champion platinum ones, and the check engine light came on. What can I do? As indicated above, I am completely new to jeeping.

I'm sorry, but, I didn't mean to high jack your post. I was just searching for answers thru the forum and kinda came accross your post with a similar issue. Thanks.
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Old 08-20-2009, 05:06 PM   #7
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It's funny how everyone thinks they are smarter than the engineers that designed the engine.

The underhood sticker tells the correct plugs to use - and the gap.
ALWAYS check the gap, the plug may have been dropped and the gap changed, or even mfrg differences can make a difference.

Torquing the correct plugs to spec also positions the ground electrode to the position it's "shadow" on the spark is minimized.
Use a touch of anti-sieze on the threads, and a touch of dielectric grease on the boots.

The correct Standard plugs may not last a million miles, but they'll give the best performance and mileage over the others.


I've heard, but haven't proved it yet - Plats fire OK on the compression stroke, but have a hard time firing on the waste spark - the polarity is reversed on the waste spark. The tiny wire electrode doesn't like the reversed polarity.
Emissions will go up, O2 sensors life is shortened, and cats fail too early.

I've never liked plats except where the heads were designed around them - like some Toyotas.

On an older conventional engine, Chev v8's etc., plats can be seen from across the room on a scope - they look like fouled plugs. Replacing them with "real plugs" makes a big difference.
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Old 08-20-2009, 05:16 PM   #8
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Old 08-20-2009, 05:54 PM   #9
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Good coverage guys, stock plugs ftw
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Old 08-20-2009, 06:29 PM   #10
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Quote:
Originally Posted by rrich View Post

I've heard, but haven't proved it yet - Plats fire OK on the compression stroke, but have a hard time firing on the waste spark - the polarity is reversed on the waste spark. The tiny wire electrode doesn't like the reversed polarity.
That's not the case with a dual-tipped Platinum plug like the Champion 7034 or Autolite APP985. Dual-tipped (platinum on both sides of the gap) platinum spark plugs work fine with the latest distributorless igntions used in 2000 and newer TJ 4.0L engines and their benefit is they'll last 100K miles without performance degradation.

It's only the cheaper single-tipped (platinum is only on the center electrode) platinum plugs like the Autolite AP985 that doesn't like the reverse polarity firing on the current distributorless 4.0L engine. And on other distributorless Jeep engines that have one coil per plug like the 4.7L V8, it is happy with single-tipped, dual-tipped, or conventional. It's the 4.0L where a coil is shared by two spark plugs where single-tipped platinums cause that problem but dual-tipped platinum plugs don't.

Older 4.0L engines with a distributor will run either type of platinum plug or a conventional spark plug without problem... it's not fussy at all.

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