spark plug recommendations? for '06 3.7 - Jeep Commander Forums: Jeep Commander Forum
Regular Service / Maintenance This section contains discussion about regular service and maintenance (upkeep) of your Jeep Commander

 
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post #1 of 10 (permalink) Old 02-24-2012, 10:46 AM Thread Starter
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spark plug recommendations? for '06 3.7

iridium,platinum.copper?? pros & cons, is higher priced plugs better? thanks for your input in advance!
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post #2 of 10 (permalink) Old 02-24-2012, 11:19 AM
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I just read yesterday that my Commander had 16 plugs. 8 on top and 8 on the bottom. Why 18? And how easy are they to change. I have a 4.7, 08 Commander.

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post #3 of 10 (permalink) Old 02-24-2012, 02:14 PM
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Quote:
Originally Posted by jaygr View Post
iridium,platinum.copper?? pros & cons, is higher priced plugs better? thanks for your input in advance!

From my experience standard plugs are plugs, but I've heard good things about the E3, better spark = more power and better gas mileage


http://www.e3sparkplugs.com/diamondfire.php

I haven't actually tried them myself, but I have had several customers advise that they have seen real world results in fuel efficiency.

I'm at 56K now so I'm thinking Im gonna give them a try when I change the plugs at 60K.

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I just read yesterday that my Commander had 16 plugs. 8 on top and 8 on the bottom. Why 18? And how easy are they to change. I have a 4.7, 08 Commander.
I've owned and have worked on several 4.7s (ASE Master Certified Technician) and have never seen that set up on a 4.7 (dosnt mean your wrong, just I've never seen it.) However the 5.7 Hemi does use 16 plugs.

The reason was to make the motor more fuel efficient as eight of the plugs provide spark for the engine, the other eight fire into the exhaust gases.This helped the EPA rating and lowered emissions by burning unburnt fuel

Ford was big on running 8 plugs in their 4 bangers back in the 80-90's and in the Rangers in the early 00s too, so its not a new concept by any means.

Last edited by fuzzy94; 02-24-2012 at 03:34 PM. Reason: spelling
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post #4 of 10 (permalink) Old 02-24-2012, 03:36 PM
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Do a search here on the E3s, folks haven't had good luck with them in the Jeep engines. I'd just go with the factory recommended plugs for the engine.

You have 16 plugs because 8 are standard plugs on top of the engine, the other 8 are iridium long-life plugs for emissions control issues. The 5.7's always had them, the 4.7 got 16 when they redesigned the engine in 2008.

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post #5 of 10 (permalink) Old 02-24-2012, 03:40 PM
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So do the bottom 8 need to be replaced? And is it easy to replace top and bottom plugs?

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post #6 of 10 (permalink) Old 02-24-2012, 04:08 PM
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Originally Posted by jaygr View Post
iridium,platinum.copper?? pros & cons, is higher priced plugs better? thanks for your input in advance!
Just two weeks ago I replaced mine with Autolite irridium plugs on my '08 3.7L. I read in another forum that Chrysler motors run best with either Autolite or Champion plugs. I must say I did notice smoother acceleration and idling and a very slight increase in power. So far so good. I drive 90 miles a day to and from work so I wanted to go with a good set of plugs. I believe I paid about $7.99 a plug from Autozone. I would recommend these.

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post #7 of 10 (permalink) Old 02-24-2012, 04:11 PM
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I believe these are the ones I went with: http://www.autozone.com/autozone/par...er=896889_0_0_

2008 Commander Limited 5.7L HEMI QDII
Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #8 of 10 (permalink) Old 02-24-2012, 06:21 PM
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Quote:
Originally Posted by mrnavy2 View Post
So do the bottom 8 need to be replaced? And is it easy to replace top and bottom plugs?
According to your manual and my memory (sometimes suspect) the lower plugs are 100k iridium or 100k dual platinum......they are supposed to be a real stinker to replace.
The upper ones are the copper core plugs used in everything from the beginning of time it seems and again, using memory, these are to be replaced at 30k intervals and IMO, these are really easy to exchange.
I am assuming you are moderatly mechanical with a fair cross section of tools.

What I have learned is the lower plugs, using the part number crossover guide, are the upgraded equalivant of the upper plug.....meaning, you should be able to buy eight of the long life lower plugs and install them in the upper position, resulting in a 'see ya at 100k' situation.

I did my research on the Champion spark plug site.

Rob


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post #9 of 10 (permalink) Old 02-24-2012, 06:30 PM
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Thanks Rob.

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post #10 of 10 (permalink) Old 02-29-2012, 11:04 AM
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Quote:
Originally Posted by rwmorrisonjr View Post
Do a search here on the E3s, folks haven't had good luck with them in the Jeep engines. I'd just go with the factory recommended plugs for the engine.

You have 16 plugs because 8 are standard plugs on top of the engine, the other 8 are iridium long-life plugs for emissions control issues. The 5.7's always had them, the 4.7 got 16 when they redesigned the engine in 2008.
Thanks for the info on both RW! I just purchased my 06 Hemi Commander two weeks ago, so Im still researching and learning about these Jeeps.

Its great to have jeepcommander.com as my go to reference!
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