'08 4.7L Commander intake and exhaust spark plugs - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 12 (permalink) Old 06-04-2014, 03:43 PM Thread Starter
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'08 4.7L Commander intake and exhaust spark plugs

I did some limited research online to change the plugs on the wifes commander. Seemed cut and dry. Upon arrival to the auto parts store, they stated i needed 4 iridium and 4 copper plugs. Don't recall which was for intake and which for exhaust. Anybody else come across this? I will be taking out the existing plugs to see whats on the truck. Any info or experience would be appreciated.
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post #2 of 12 (permalink) Old 06-04-2014, 04:19 PM
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Too bad you don't have a Hemi - they use 16 spark plugs I'd stay away from that auto parts store.

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Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
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post #3 of 12 (permalink) Old 06-04-2014, 08:52 PM
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What do you need plugs for exhaust?? I did 8 of the same in my 4.7. Watch they may next recommend you replace the muffler bearings
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post #4 of 12 (permalink) Old 06-04-2014, 08:54 PM
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Quote:
Originally Posted by Creek View Post
What do you need plugs for exhaust?? I did 8 of the same in my 4.7. Watch they may next recommend you replace the muffler bearings
Or headlight fluid.

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post #5 of 12 (permalink) Old 06-04-2014, 09:09 PM
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In 2008 a new 4.7L was put in the XK's which included two plugs per cylinder. The 2nd plug is known as "waste spark" and detonates during exhaust stroke.

-Matt
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post #6 of 12 (permalink) Old 06-04-2014, 10:29 PM
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Who would know, first I have heard of 2 plugs per other than the Hemmi.

Last edited by Creek; 06-05-2014 at 06:17 AM.
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post #7 of 12 (permalink) Old 06-05-2014, 04:08 PM
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That would only be *8 plugs in total, but two different kinds of plugs, Sounds like a scam Or they think you have a Hemi v4

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post #8 of 12 (permalink) Old 06-09-2014, 10:45 AM Thread Starter
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It does have the "waste spark" for the exhaust, which is an iridium plug that the manual stated need replacement at 100k. I changed the 8 copper intake plugs located underneath the coils. Hope this helps in the future. There was limited info about the engine on this site.
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post #9 of 12 (permalink) Old 06-09-2014, 10:47 AM Thread Starter
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Also, it does take 16 plugs (8 iridium/8 copper). Not 4 and 4 as i was first led to believe.
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post #10 of 12 (permalink) Old 06-11-2014, 11:34 AM
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Why is everyone talking about intake and exhaust spark plugs? Spark plugs fire either on the compression stroke or power stroke. Spark on intake would cause a backfire through the intake and on Exhaust probably something in the tail pipe. Or is this 4.7 engine also converted to 2 cycle?

06 Commander Limited Hemi - QDII,
Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
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