OEM Spark Plugs - 5.7 Hemi - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 26 (permalink) Old 01-18-2011, 12:04 PM Thread Starter
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OEM Spark Plugs - 5.7 Hemi

I'm sure this has been listed here before, but I've searched and cant find it. Anyone know what the OEM spark plugs are for the 5.7 Hemi? I dont want upgrades (platinum, iridium) since I've heard they cause stalling/engine shudder problems.
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post #2 of 26 (permalink) Old 01-18-2011, 12:10 PM
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If no one else gets to it ill post up the info after work today. I actually had to buy them from the dealer since my local parts stores were out of the part number I needed..... I think I paid an extra $2 per plug line that which sucks.... but $32 is peanuts in the grand scheme of things when considering engine maintenance IMO.
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post #3 of 26 (permalink) Old 01-18-2011, 12:23 PM Thread Starter
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Thanks in advance Matt. If you have a link to a site that carries it would be much appreciated too.
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post #4 of 26 (permalink) Old 01-18-2011, 01:23 PM
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The OEM plugs are Champion copper cores. I looked them up on sparkplugs.com, and they say it's part # RE14MCC4.

Good luck!
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post #5 of 26 (permalink) Old 01-18-2011, 02:16 PM
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Yeah, I'll vouch about this one. I had done the switch to Autolite Plantinums, and was sorely experiencing the lack of mpg improvements and some hesitations. The car ran stronger when I switched back to OEM Champion coppers.
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post #6 of 26 (permalink) Old 01-18-2011, 05:39 PM
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Can't seem to find my receipt... but they're just the Champion Copper plugs that lekmedm posted. Pep Boys has them for $1.69 each but they only had 11 in stock when i went.

I guess they rarely carry more than 16 of the same plugs at a time (i'll just buy them in advance next time... they get parts delivered every few days so i'll buy them out twice in a row )
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post #7 of 26 (permalink) Old 01-30-2011, 11:29 PM
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The wasted spark system, where 2 plugs share one coil, one of the plugs have a reverse current flow, that reverses anode/cathode, and in a case of a single platinum plug, half of them will transfer the softer steel to the platinum with the current, eating away the plug faster than if it was just plain steel on both sides.

You need to use double platinum, where there is platinum on both sides of the spark, with these kinds of ignition systems. BUT, like people have been posting, for the Commander and other Chrysler vehicles, with this kind of ignition, some have found that other than the specific OEM plug can NOT be as reliable or cause problems.
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post #8 of 26 (permalink) Old 02-15-2011, 08:59 AM
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spark plugs

I just bought a 2007 Commander Hemi Limited, it has 51k on it, I was told that I needed to change the spark plugs at 60k??? currently I'm getting 18.5pmg on the highway AND 14-15MPG around town... in atlanta!!!! I'm very happy with the milage.... do I really need to change the plugs at 60k??
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post #9 of 26 (permalink) Old 02-15-2011, 09:09 AM
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Join Date: Mar 2008
Location: Annandale, NJ
Own a Commander?: Yes
Model year: 2007
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Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 232,700
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Quote:
Originally Posted by Mongo View Post
The wasted spark system, where 2 plugs share one coil, one of the plugs have a reverse current flow, that reverses anode/cathode, and in a case of a single platinum plug, half of them will transfer the softer steel to the platinum with the current, eating away the plug faster than if it was just plain steel on both sides.

You need to use double platinum, where there is platinum on both sides of the spark, with these kinds of ignition systems. BUT, like people have been posting, for the Commander and other Chrysler vehicles, with this kind of ignition, some have found that other than the specific OEM plug can NOT be as reliable or cause problems.
Wow! Thanks for the education. I have a question... How do iridium plugs work? I'll be sure if I choose platinums next time to go with double plats.

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post #10 of 26 (permalink) Old 02-15-2011, 09:13 AM
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Join Date: Mar 2008
Location: Annandale, NJ
Own a Commander?: Yes
Model year: 2007
Trim Package: Overland
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 232,700
Posts: 953
Garage
Quote:
Originally Posted by MarineMatt View Post
I just bought a 2007 Commander Hemi Limited, it has 51k on it, I was told that I needed to change the spark plugs at 60k??? currently I'm getting 18.5pmg on the highway AND 14-15MPG around town... in atlanta!!!! I'm very happy with the milage.... do I really need to change the plugs at 60k??
I'm no mechanic, and certainly not any kind of authority in all things automotive, but my approach has always been that regular maintenance per the owner's manual is "cheap" insurance that you will avoid potential problems or premature wear of your vehicle. I try to do as much of the work myself to keep costs down.

So, if the plugs were never changed, IMO, you are due.

Good luck and welcome to the forum!


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