Changing Spark Plugs - 4.7 Discussion - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 228 (permalink) Old 12-22-2007, 02:34 PM Thread Starter
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4.7 - V8 Spark Plug change Write-up

i don't know if anyone has written a write up on changing spark-plugs on the 4.7L commander. but since i'm pretty mechanically inclined and CHEAP i don't pay anyone to work on my vehicles.

Tools needed for the Job:

10mm socket
5/8" spark plug socket tool
short 3/8" extension
long 3/8" extension
3/8" socket driver
Flat head screw driver

Time needed: about an hour

Parts needed: 8 spark plugs of your choice.

My commander only has 26K on it. but since i bought it used i decided what the hell, i might as well change the plugs. they weren't in bad shape, but they were champion spark plugs and i really hate those.

i picked up 8 NGK V-Power spark plugs for $22. I have been using this brand in my vehicles for years.

i also noticed when i pulled my old spark plugs the gap was not right. they are supposed to be gapped a .044". my old plugs were gapped at .038".


Step 1.

remove the intake pipe and intake resonator. there are 3 clamps holding all the intake piping together use the flathead screw driver to loosen these. and there are 2 10mm bolts holding the resonator to the intake. unbolt and set somewhere out of the way.




here are pictures of the 2 10mm nuts holding the resonator in place. also don't forget to unhook the air temp sensor the the passenger side of the motor. you can see it on the bottom picture.


Last edited by Get Lost 4X4; 12-22-2007 at 02:51 PM.
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post #2 of 228 (permalink) Old 12-22-2007, 02:46 PM Thread Starter
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this is where the hose clamp is on the throttle body.


this is what it looks like without the intake stuff on.

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post #3 of 228 (permalink) Old 12-22-2007, 02:48 PM Thread Starter
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Step 2.

there are 8 coils held in place with a 10mm nut. remove the 8 nuts with the 10mm socket and driver you may need the extensions for this, and put somewhere safe.

Step 3.

unhook the wires connected to each coil.

pictures for for steps 2-3



this is the coil there are 8 of these



Step 4.

remove the coil on the spark plug. i kept mine in order of where they came from. i'm not sure if it makes any difference or not. but i didn't want to find out the hard way. use the extension and 5/8" spark plug socket for this step
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post #4 of 228 (permalink) Old 12-22-2007, 02:49 PM Thread Starter
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Step 5.

gap your spark plug to .044". remove the old spark plugs and install the new ones.



for comparison. old plugs verses new plugs.





Step 6.

reverse the process and enjoy.
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post #5 of 228 (permalink) Old 12-27-2007, 09:12 AM Thread Starter
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well, i guess no one has anything to say.

i have been driving it with the new plugs. i must say i am very impressed with these NGK's. my mileage has gone from 16.5 mpg up to 19.5.

when i'm cruising at 70 i get between 20 and 22 now.

i also added a Trueflow air filter about 1 month ago.

the commander does not down shift as much on hills anymore. i'm very happy!
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post #6 of 228 (permalink) Old 12-27-2007, 02:24 PM
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Do you know if the 3.7L V6 engine uses the same spark plugs as the V8?

Do you know anything about these plugs that NGK make? The Iridium plugs. http://www.partsamerica.com/ProductD...pe=960&PTSet=A

I heard that they really make a huge difference.
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post #7 of 228 (permalink) Old 12-27-2007, 03:48 PM
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I don't have the 4.7L, but do appreciate you taking the time to document this. I do plan on going with Iridium plugs when it's time to change, but it will be a while before that happens because I just went past 10,000 miles. Also, the Iridium plugs will be very expensive since I will need 16.

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post #8 of 228 (permalink) Old 12-27-2007, 05:01 PM Thread Starter
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they said on the 4.7 you do not need to run platinum or irridium. its just a waste on that motor. i would imagine it would be the same with the 3.7L.

since the 5.7 is a higher compression motor i would imagine the more expensive plugs would be better.
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post #9 of 228 (permalink) Old 12-27-2007, 07:50 PM
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Nice job on the write up. With the performance gains you recieved - Will that eventually go away with the wear of the plugs or is that a gain because of better quality and proper gap?

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post #10 of 228 (permalink) Old 12-27-2007, 07:57 PM
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Excellent writ eup. I am surprised at the MPG improvement if with the gap tolerance difference. Are the new plugs a bit hotter or did you stay the same? Your old plugs didn't look too bad.

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