Changed Plugs/Followed Forum Sticky - Jeep Commander Forums: Jeep Commander Forum
Programmers/Engine Mods Questions or advice about programmers or engine mods? This is the place...

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post #1 of 2 (permalink) Old 02-08-2009, 05:45 AM Thread Starter
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Changed Plugs/Followed Forum Sticky

I had 23500 on the OD and was getting between 18-19 mpg (computer)@ 55 mph back and forth to work 4.7L Flex. I had some time this weekend so I changed my plugs following the sticky in this forum and boy am I glad I did. The sticker inside my hood calls for RC12MCC4's @.040.

The original plugs where all gapped between .044 & .048. 4 of them did not have a square edge anywhere on the electrode. All where covered in a green film.

A few things I learned:
The throttle body cover has a band clamp on the backside (DUH).
On the passenger side, to get the last 2 out I needed to move the oil dip stick tub. 1-10mm nut holds it via bracket. Gently lift bracket over screw and push towards throttle body about 1 inch.
On the passenger side remove front to back, but install back to front. The plug closest to the firewall is tough to get at. You will need all the space you can get if you install the plug in front of it first the coil pack will just be in your way.
Getting the old plugs out, I realized why I was putting anti-sieze on the new ones!

When done a 40 mile test drive showed 22.6 mpg (computer). As this was the first time under the hood and in no hurry took me about 1 1/2 hours. These will be good until fall....then I'm dropping in NGK Iridiums.

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post #2 of 2 (permalink) Old 02-08-2009, 09:41 PM
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Funny, I changed mine today as well. I went with Champion double platinum's. I have 32,000 miles and I would have reused every plug I pulled out. All of them looked good, just some light white/gray on them and no wear (square edges all around). Your recommendations are right on the spot, I used all the info I could find on the site, and nowhere did it mention the screw behind the throttle body, learned that lesson. I gapped all my plugs at .044, because that was what I remembered. Test ride did well, I will replace in 60,0000.

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