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Old 11-12-2016, 05:55 PM
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Spark plug change on 2014

Got a cylinder 1 misfire code to change plug and coil. I have 130k on it. Bought new plugs. Looked at the engine, and I see on the passenger side it looks easy to pull the coil packs. But, the driver side has the air flow deal covering up the head. I have searched You Tube, Google, here, and owners manual. Nothing on 2014 spark plug change. It looks like a bitch to get the air flow deal off, but I will give a try in the morning. Next will check out a Haynes manual on-line.

Has anybody taken off the air flow deal????

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Old 11-12-2016, 06:30 PM   #2
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Originally Posted by TrojanBob View Post
Got a cylinder 1 misfire code to change plug and coil. I have 130k on it. Bought new plugs. Looked at the engine, and I see on the passenger side it looks easy to pull the coil packs. But, the driver side has the air flow deal covering up the head. I have searched You Tube, Google, here, and owners manual. Nothing on 2014 spark plug change. It looks like a bitch to get the air flow deal off, but I will give a try in the morning. Next will check out a Haynes manual on-line.

Has anybody taken off the air flow deal????
Easy peasy just time consuming. Look in my signature, and go the last page, ive posted some pictures with everything you need to take off. I didn't write a step by step, but I've highlighted everything where there is a bolt or something to take off. I have a 13, but everything should be the same, I wish I knew why Jeep buried the plugs underneath the intake plenum, but is not as complicated as you migth think, don't take off the bolts in the plenum, just loose them all up until you can lift them with your hands. One of them is at the back of the plenum, close to the firewall, I've highlighted the ones that are not easy to see in green.

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Old 11-13-2016, 03:40 AM
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Wow! Just what I was looking for. Thanks for replying, and I appreciate you documenting removing the plenum. Didnt think anyone had gotten up to required mileage to change plugs on this type of JK yet, but me. I will give her a whirl this morning (Sunday).
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Old 11-13-2016, 10:14 AM   #4
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Wow! Just what I was looking for. Thanks for replying, and I appreciate you documenting removing the plenum. Didnt think anyone had gotten up to required mileage to change plugs on this type of JK yet, but me. I will give her a whirl this morning (Sunday).
Np have fun.
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Old 11-13-2016, 11:16 AM   #5
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Found this for you as well. Wish i had it when i did mine a couple of weeks ago, it would have saved me hours of guessing , step by step with pics. i was looking how to wire an alarm for the Jeep and came up with this, go figures.

https://dsjeeps.com/2014/10/18/3-6l-...ide-with-pics/
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Old 11-13-2016, 06:58 PM
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Got it done, but it was not easy peasy. Did not take the plenum all the way off, and that foam thing was a PITA to work around. Had one bolt left over. A 8 mm like the ones on the passenger side, but a tapered end. I recall pulling it out and thinking it was not like the others. After the brain drain of pulling out, and putting back in the plugs, I could not figure out where it went.

Check engine light is still on. Had a slight shimmy on the restart. If I get the same code again, I will replace the coils, and figure out where that lone bolt/screw went. But did get 1 to 2 more MPGs.

Took me 2 to 3 hours. Very exhausting. Would take cover all the way, since to get it loose enough is almost enough to get it off.
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Old 11-13-2016, 07:57 PM   #7
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I had to work on it half way on a small ladder to get to the bolts in the back
2-3 hours for your first time is not bad, it took me around 5, cursing Jeep and the brilliant engineers who decided the spark plugs had to be located in there. I figure next time it'll take around 2-3 now that i know how everything goes., taking the entire plenum out gives you a lot of room, i didn't think it was possible to get the plugs out without lifting the darn thing, props to you for doing it that way.

Drive around and see if the light goes away, or unplug the battery and reset the computer, then check to see if the condition persist.
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Old 11-14-2016, 06:32 AM
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Took about an hour to unbolt plenum, using step ladder. I did not disconnect everything you had arrow to. 2 hours to change plugs. Not too long to bolt back together.

Here is my advice to others -

1. Dont wait till 132k miles to change plugs. My electrodes were very eroded. new plugs increased my MPG by 2.
2. Consider changing the coils, since you dont want to do this twice.
3. Have a clear head, good nerves, and hangover free.
4. have every kind of ratchet extension possible, including articulating.
5. step ladder.
6. Flood light and flashlight,
7. magnetic pick up deal - to pick up sockets and bolts that fall into engine compartment.
8. Consider taking entire plenum off. YOu will have to, to change coils. It will give you more confidence when putting the plugs back in. Also, its damn near impossible to change the plugs if you dont remove plenum.
9. have rsmwrangler's post handy to look at when working.
10. read the link rsmwrangler posted above.
11. as in that post, releasing your hood all the back to the windshield, have someone to help push and pull pipes as you work. and help getting plenum back over the bracket studs when re-assembling.
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Old 11-14-2016, 06:45 AM   #9
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Got it done, but it was not easy peasy. Did not take the plenum all the way off, and that foam thing was a PITA to work around. Had one bolt left over. A 8 mm like the ones on the passenger side, but a tapered end. I recall pulling it out and thinking it was not like the others. After the brain drain of pulling out, and putting back in the plugs, I could not figure out where it went.

Check engine light is still on. Had a slight shimmy on the restart. If I get the same code again, I will replace the coils, and figure out where that lone bolt/screw went. But did get 1 to 2 more MPGs.

Took me 2 to 3 hours. Very exhausting. Would take cover all the way, since to get it loose enough is almost enough to get it off.
What code do you have? I'd bet you have a vacuum leak or a EVAP emissions system leak code.

The job looks like a major PITA to do, and as someone else mentioned I would change the coil packs too, and put the longest lasting best available plugs in there.

I wonder what a shop and dealership would charge for the job.

Are there any gaskets that need to be replaced or re-used?

Thanks...
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Old 11-14-2016, 08:04 AM
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The code was P0301 - Cylinder 1. Misfire. Replace ignition coil and spark plug. Engine was running a tad rough. Kind of unbalanced.

No gaskets to replace. The plenum sits on 6 ports, and bolts hold it on tight. Just air flowing thru there. Could have been gaskets or o-rings in a groove. If so, they did not come out. I just un-boltered it enough to lift it a few inches to pull out the coil boots. The boot is very flexible. Plenum can only go back in the exact correct spot, or bolts will not tighten down. In conclusion, I did not have to F with any gaskets.

Like I said, I would take off the plenum to give you more confidence. I am sure there is other 100k type maintenance that could have been done. This prob popped up last week. I do a lot of driving, and only had a few free hours to fix until I had to be back at work today (Monday).

This is a risky job, that once you are in and you dont know what you are doing, you can not just back out. If you have not changed plugs in newer model vehicles, I would not attempt.
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Old 11-14-2016, 08:48 AM   #11
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Thanks for posting the details - saved this thread for future reference.
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Old 11-25-2016, 05:06 PM   #12
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I just went through this process earlier today...

Have a P0303 code (Misfire on Cylinder 3), so I figured I would replace the ignition coil to see if that got rid of the issue.

Can anyone shed light on how the cylinders are numbered? I have a crude diagram on how I believe it's numbered (with odds being on the passenger side, with 1 being closest to the grille), but for all the searching I've done, I cannot seem to find verification.

Passenger Side
1 3 5
2 4 6
Driver's Side

Can anyone confirm? Thanks
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Old 11-25-2016, 09:03 PM   #13
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It's in this thread:

Cylinder Firing Order
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Old 11-27-2016, 12:03 AM   #14
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I couldn't get past the fact that you have 130k miles on a 2014.

Even if you got it in September of 2013, that's 40k a year!

Very impressive!

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