How To: Spark Plug Change - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 32 (permalink) Old 05-28-2010, 12:24 AM Thread Starter
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How To: Spark Plug Change

I aplogize in advance that this is aimed at the not very mechanical crowd so that they might save a few dollars and appreciate thier ride even more.

Takes about an hour or more - Thanks for the heads up EburgJeep forgot who i was writing for! Edited by albertschmitz

Tools Needed:
Anti Sieze Compound
Good Plug Gapping Tool
Pliers - You never know
Straight Pick - helps with plug connections
1/4 Drive Ratchet with 3 " extension and Deep #10 socket
#10 ratcheting Combination wrench
3/8 Drive ratchet with 6" extension and 5/8 spark plug socket - does not need to be a swivel socket
5/16 nutdriver - for the 3 clamps - intake hose and behind the airbox attached to the throttle body.

View from the front - I always start on the Passenger side - usually toughest and takes the longest. Makes you appreciate the drivers side



Loosen clamp closest to the main airbox



And then by the air filter box



Remove hose



Locate and unclip the plug for the IAT on the main airbox passenger side





Remove bolt from the passenger side main airbox



1/4 drive with the #10 socket


And then the Drivers Side



same 1/4 drive and #10


2008 Red Rock Limited

Last edited by albertschmitz; 05-30-2010 at 07:58 AM.
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post #2 of 32 (permalink) Old 05-28-2010, 12:26 AM Thread Starter
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And the clamp behind the main airbox attached to the throttle body





Now lift the front of the main airbox a bit and pull forward, if it has not been off before it will be a little tight.



You will now see the 6 or 8 coil on plug modules that need to be removed for access to the plugs - Blow them and the surrounding area off with compressed air so as not to get any debris in the cylinders when the plugs are removed.

Installed



Lifted out



They will lift up - a little effort here but no tools other than hands, try to come up straight. The passenger side rear one will require that you ease the transmission tube towards the passenger fender a bit for clearance. There is a bracket that holds a connector back there that will need to be reinstalled after the plug is finished.

Here is the connector and bracket area



The red tab will need to be slid over a small ways so that the connector can be unlatched - it is a vibration lock and you will need to make sure that you push it back when you reconnect it.



Get your plugs out and verify the gap (.044 on the 06 4.7 Liter Commander) Better to do all at once and put the protectors back on than try to remember as you are going.





Be gentle on the gaps remember they are moving in thousandths of an inch not inches.

2008 Red Rock Limited
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post #3 of 32 (permalink) Old 05-28-2010, 12:27 AM Thread Starter
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As for removing the old plugs they will be in there snugly so you will need to use some force to remove them, if it seems excessive make sure that you are lefty lucying not righty tighening them!!!!!!!!!!!

Place the used plugs in a scrap piece of cardboard so that you can have a mechanic look them over to see if there are any problem areas. You want them in the same location that they came out of the engine so if there is a problem the mechanic will know what cylinder/bank to look at.

Use a box bottom 8" by 10" will suffice, to make an area for the plugs take a box cutter and slice an X for each plug and put the top in first so the electrode is facing up. Make sure you mark passenger and drivers side.

I just put the thread protectors from the new plug to the used one as they come out and mark the gap and location.

Example of a typical original plug at 91000 miles of use and normal wear.




The old ones like mine all read in the .054 to .060 range and that is normal, not good for fuel economy but normal wear and nothing to worry about.

Remove and replace the plugs one cylinder at a time and put a small amount of antisieze compound on the threads before install.

The plugs need to be tight but not cranked in place.

If you are a big person do not crank them down you will not like the bill that you will receive for the helicoil repair on the head.



Good luck and I hope that this saves you a few dollars for a necessity like, I dunno mods? accessories and you know the basics.

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post #4 of 32 (permalink) Old 05-28-2010, 12:29 AM Thread Starter
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Almost forgot, reverse procedure of disassebly before starting the Commander up

2008 Red Rock Limited
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post #5 of 32 (permalink) Old 05-28-2010, 11:51 AM
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I will make this a sticky. Nice write up.



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post #6 of 32 (permalink) Old 05-28-2010, 07:59 PM
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Nice Post. Thanks. U mean to tell me u actually put 91,000 miles on the original plugs? WOW!
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post #7 of 32 (permalink) Old 05-28-2010, 09:05 PM Thread Starter
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Quote:
Originally Posted by Mn_Commander View Post
Nice Post. Thanks. U mean to tell me u actually put 91,000 miles on the original plugs? WOW!
Yes bone stock factory Champions in there, they will go 100,000, but the fuel economy really starts to suck in town. The coil packs can fire with enough power for larger gaps, but I would recommend highly against that. Plugs only cost 1.75 to 5.00 depending on the brand and cores. I use Denso or NGK because I have always had great luck with them in all of my cars, trucks and bikes.

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Last edited by albertschmitz; 05-28-2010 at 09:07 PM. Reason: Cannot spell korektly
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post #8 of 32 (permalink) Old 05-28-2010, 09:13 PM
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If I can make one suggestion. I saw this in another thread and I did it and was glad I did. Which is to use a compressor to blow out all the dust a debris before removing the plug its self. I did it and man the stuff that came flying out of there that could of possibly slipped in while changing the plugs just suggestion. Awesome post by the way.


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post #9 of 32 (permalink) Old 05-28-2010, 09:18 PM Thread Starter
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Quote:
Originally Posted by SAL View Post
If I can make one suggestion. I saw this in another thread and I did it and was glad I did. Which is to use a compressor to blow out all the dust a debris before removing the plug its self. I did it and man the stuff that came flying out of there that could of possibly slipped in while changing the plugs just suggestion. Awesome post by the way.
This is on the second post, I totally agree!!!

"You will now see the 6 or 8 coil on plug modules that need to be removed for access to the plugs - Blow them and the surrounding area off with compressed air so as not to get any debris in the cylinders when the plugs are removed."

2008 Red Rock Limited

Last edited by albertschmitz; 05-28-2010 at 09:20 PM. Reason: error
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post #10 of 32 (permalink) Old 05-29-2010, 11:52 PM
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Unless you can crank things out on your vehicle, plan for an 1 hour or more
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