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How to Replace Spark Plugs 07-18 Jeep Wrangler

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How to Replace Spark Plugs 07-18 Jeep Wrangler

Created on: 2019-04-22

How to repair, install, fix, change or replace rusted, corroded, or stuck spark plugs on 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17, 18 Jeep Wrangler

  1. step 1 :Removing the Intake Plenum to Access the Spark Plugs
    • Remove the plastic engine cover
    • Disconnect the negative terminal of the battery
    • Remove the two 10 mm bolts securing the intake snorkel
    • Loosen the worm clamps attaching the snorkel to the throttle body and air filter box
    • Disconnect the intake temperature sensor mounted to the bottom of the intake snorkel
    • Remove the intake snorkel
    • Disconnect the throttle body electrical connector
    • Remove the wire retainer clips with a panel tool
    • Disconnect the MAP sensor electrical connector
    • Disconnect the vacuum line from the front driver side of the intake plenum
    • Disconnect the two hoses connected to the front passenger side of the intake plenum
    • Remove the hoses along the passenger side of the intake plenum from the brackets
    • Pry up the two retainers fastening the insulation foam at the back of the intake plenum
    • Remove the two 10 mm bolts and engine cover brackets at the back of the intake plenum
    • Remove the insulation
    • Remove the two 10 mm nuts fastening the mounting studs at the front driver side of the intake plenum
    • Remove the two 10 mm nuts fastening the mounting studs at the back driver side of the intake plenum
    • Remove the seven 8 mm bolts on the top, passenger side, and rear of the intake plenum
    • Disconnect the host attached to the air filter box to access two 10 mm bolts securing the intake plenum to a bracket under the hoses on the passenger side of the intake plenum
    • Remove the two 10 mm bolts on the passenger side of the intake plenum
    • Remove the 10 mm bolt from the front mounting bracket to remove the bracket
    • Loosen the 13 mm bolt holding the rear driver side mounting bracket
    • Lift away the intake plenum
    • Fill the intake ports with paper towels or clean rags to prevent debris or tools falling inside them
    • Remove the insulating foam from the driver side of the engine
  2. step 2 :Changing the Spark Plugs
    • Disconnect the electrical connector from the ignition coil
    • Remove the 10 mm bolt securing the ignition coil
    • Remove the ignition coil
    • Use the 5/8 spark plug socket to remove the spark plug
    • Compare the old and new spark plugs to ensure the new spark plug is correct
    • Insert the new spark plug and tighten by hand using the 5/8 spark plug socket
    • Use a torque wrench to tighten the spark plug to 13 ft-lb
    • Use dielectric grease on the ignition coil boot
    • Replace the ignition coil
    • Secure the ignition coil with the 10 mm bolt
    • Reconnect the electrical connector to the ignition coil
  3. step 3 :Replacing the Intake Plenum
    • Replace the driver side insulating foam
    • Remove the paper towels or rags from the intake ports
    • Remove the six intake gaskets with a pick
    • Install new intake gaskets
    • Replace the intake plenum
    • Tighten the seven 8 mm intake plenum bolts
    • Torque the seven 8 mm bolts to 7.5 ft-lb in the specified order
    • Replace the 10 mm nuts on the intake plenum mounting studs at the rear driver side intake plenum mounting bracket
    • Tighten the 13 mm bolts at the bottom of the rear mounting bracket
    • Replace the front intake plenum mounting bracket with the 13 mm bolt
    • Replace the two 10 mm nuts on the front mounting studs of the intake plenum
    • Replace the two 10 mm bolts on the passenger side intake plenum mounting bracket
    • Replace the rear insulating foam
    • Replace the two engine cover mounting brackets with the 10 mm bolts
    • Replace the thick hose connecting to the front of the intake plenum
    • Replace the hose connecting to the air filter box
    • Replace the plugged hose in its brackets
    • Replace the thin line connecting to the front of the intake plenum
    • Reconnect the MAP wiring harness retainer clips
    • Reconnect the MAP electrical connector
    • Replace the vacuum line connecting to the front driver side of the intake plenum
    • Replace the retainer clips on the passenger side wiring harness
    • Replace the throttle body wiring harness retainers
    • Replace the throttle body electrical connector
    • Reconnect the intake air temperature sensor electrical connector
    • Reconnect the intake snorkel to the throttle body and the air filter box
    • Replace the two 10 mm intake snorkel mounting bolts
    • Tighten the two intake snorkel worm clamps
    • Reconnect the hose that clips in along the intake snorkel
    • Replace the engine cover
    • Reconnect the negative battery terminal with a 10 mm socket

Tools needed for replacement

  • General Tools

    Pick

  • Materials, Fluids, and Supplies

    Dielectric Grease

    Paper Towels

  • Pliers, Cutters & misc Wrenches

    Hose Pliers

    Needle nose pliers

  • Ratchets & Related

    Socket Extensions

    Torque Wrench

    Universal Joint

    Ratchet

  • Screwdrivers & Related

    Flat Blade Screwdriver

  • Sockets - Metric

    8mm Socket

    10mm Socket

  • Sockets - SAE

    5/8 Inch Spark Plug Socket

  • Specialty Tools

    Trim Tool Set

Installation Video
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What's up guys? I'm Andy from 1A Auto. In this video I'm going to show you how to replace the spark plugs on this 2015 Jeep Wrangler. If you need parts for your vehicle, click the link in the description and head over to 1aauto.com.

Take this cover off, just grab underneath, lift up, slide it forward. Alright, so I'm going to take a 10 millimeter socket and a ratchet and I'm going to loosen up the negative terminal on the battery. It's always a good idea to disconnect the battery when you're doing a job like this.

Alright. I'm going to remove this snorkel before I take the intake off. I don't necessarily have to remove the whole thing, but I'm going to remove it so it's easier to work on. Take a 10 millimeter socket and ratchet. Take these two bolts out. Take a straight blade screwdriver, loosen up this worm clamp right here. And this side. I can grab this, pull it out. There is a intake temperature sensor right under here. Just push down on the lock, pull the connector out, pull this hose off here. Now I just slide this out and out of our way.

I'm going to disconnect this electrical connector to the throttle body. I'll just use this straight pick. I want to pull this lock out a little bit. Just like that. Once that's out, should be able to push the lock down. Pull the connector out.

This little wire retainer right here, I'm going to slide that off just like that. Now I got it out. Pull that out.

Just going to use this trim tool right here. There's some things that are holding the wires on, these little wire retainers. Slide behind behind here. Just pry these off. Right here. We actually sell this at 1aauto.com.

Pry that off. I'm going to disconnect this map sensor and slide this wiring harness out of the way. Let's pop this off here just like that.

I'm going to take this vacuum line off right here. I'm just going to use these hose pliers. If you don't have hose pliers, you can try getting a pick behind the front of the hose, but these hose pliers work pretty good. Just twist it back and forth and slide it off just like that. You can try to use regular pliers on it, just be careful. It should be okay.

Going to take these two hoses off here. You can just grab them and slide them off. This goes to the EVAP system and then this one goes to the PCV system, so just take a pick, try to get underneath here. Oops. I thought that was part of the hose, but ... Alright, so that it slides off like that. And you might see a little bit of oil in there. That's okay.

Alright, all these are, these hoses are in this bracket right here. We're just going to slide these hoses out of the bracket. Alright, that's good. Just get those out of the way a little bit. Up on top there's two retainers that hold this insulation on, so just use a trim tool, take these off. Pick that up. Pop this on up. Just use a 10 millimeter socket. Take this bolt out. Take that out, set it aside, and do the same with this one. Grab this insulation, slide it out.

There's two nuts right here that we need to take off and two nuts right here. I'm going to use a 10 millimeter socket and a ratchet to take them all off. Oh, try not to drop them. I'm just going to take a magnet and grab this nut and there you go. Got it.

Take these two off. So now I want to take all these intake bolts off. This plenum bolts. There is seven of them. So there's three right here, three right here, and there's a hidden one in the back. Don't forget that one. Just using an eight millimeter socket and a long extension and a ratchet.

For this last one, I'm just going to use a universal joint. I just put electrical tape on it, that way it doesn't move around as much. That helps out a little bit. Can lose it. Loosen this back one up, slide it up. Oh, it's two bolts they missed. Alright, so there's a little bracket right here, it's two 10 millimeter. Alright, so we'll slide these hoses out of the way. Actually this hose, I'm just going to disconnect right here, or right here. Grab my hose pliers so I can get this out of the way a little bit and that one doesn't want to come off there. So try over here. There we go. Slide that off and I can move this out of the way a little more. You could use a bungee cord and hold that out of your way if you want.

I'll take a 10 millimeter socket and my ratchet, loosen these bolts up, take them out. Alright, we've got those out. Alright, so the intake's loose, as you can see. So there's these studs, they go through this bracket and that's preventing me from being able to lift it right here. And then same right here. Now you can't take those studs out because there's these little washers on the backside that are attached to those studs.

And then over here there's a bracket on this side that's preventing me from lifting the intake so I can only lift it so high. So at this point, I'm going to loosen up, take these two 10 millimeter bolts out right here. We'll just use a 10 millimeter socket. Take this bracket off first. Take that bracket off. So this bracket right here with those studs going through is preventing me from being able to lift the intake right there. What I'm going to do is loosen that bracket up from down below. It's easier to get to this bracket than the other side. The other side has a lot more stuff in the way, so I'm just going to use a 13 millimeter socket and a ratchet. There's a stud right here. Loosen this up. It's either a stud or a nut.

So loosen that one up and then over here, do the same on this side. If you have trouble getting your hand in here, you can pull the wheel well out and try to get it through the wheel well. Alright, so that's loose enough so that I can pull that off so I can lift up on the intake. Okay. Try to slide this out.

It's getting caught on something. There we go, and slide it up.

This is the bracket that was causing me trouble right here. You could just get a pry bar and just pry up on it a little bit. Not necessarily bend it, but just pry it out of the way while you're trying to lift up on the intake. So there's the intake with the gaskets. You want to be careful in this area. You don't want to drop any bolts down in there. It's a good idea to put some rags down. Just remember to take them up before you reinstall the intake.

I don't push them all the way in because if you push them all the way in, you might forget they're in there, so just keep them out a little bit. That'll just prevent if you did happen to drop a bolt from actually going down in there. I'm just going to pull this insulator up, slide that out of the way.

Now we have access to both side coils and plugs. It's nice and open over here and the other side. You could actually do the other side without taking the intake off, but what's the point? You might as well get the intake off so you can access all of them at once.

Alright, so I'm going to disconnect this coil right here. Just push down on the lock. Disconnect the connector. Take this 10 millimeter socket and ratchet, loosen up this bolt right here. Take that bolt, loosen it up, and then grab the coil. Just twist it back and forth and slide it up.

Your spark plug's down in that hole right there. And we're going to use this 5/8 spark plug socket. We actually sell this at 1aauto.com. It's got a magnet in the end of it, so once you loosen up the plug, you can actually pull it out with the magnet. Take an extension and a ratchet, loosen it up.

These spark plugs are pretty long, so there's a lot of threads and can slide it out. And there's the spark plug.

So before we install our new spark plugs, we want to check them with the old spark plug. Make sure they look the same. If they look significantly different, don't put them in. If you were comparing these two threads, if one was excessively long and one was short, then you have the wrong plugs. So make sure they at least look like the old ones. Now these new plugs, we're not supposed to gap these, they're iridium plugs, so we're just going to install them. They come pre-gapped.

Take our spark plug socket extension. Be careful not to drop this at this point. We'll just slide it in slowly. Just do this by hand.

Alright, once that's snug by hand, I'm going to take a torque wrench and I'm going to tighten these to 13 foot pounds. We actually sell this torque wrench at 1aauto.com.

And that's it. Pull that out. It's always a good idea when you take the coil with the new boot and take a little dielectric grease, make sure the dielectric grease is meant for spark plugs, and you just put a little bit down there. That's going to make it easier to install. It's going to prevent it from sticking and prevent corrosion.

Take the coil, slide this on. Get the bolts started. Use a a 10 millimeter socket and ratchet and we'll snug this down. Not too tight, just snug, and then take the electrical connector, plug it in, and we're going to do the same procedure for the other ones.

Alright, so I'm doing this coil last. This actually seems to be the hardest coil to get to, minus the coils under the intake. I'm just going to slide it up. This bracket's kind of in my way. And that disconnected. Actually that wasn't too bad, so you want to pull this wire out a little bit. Normally this would've been connected. So pull that out and slide this coil out and then you can access the plug.

Alright, so I get that plug in. Now I'm just going to torque that. Now when you're taking this spark plug socket out with the extension, I have to pull this out a little bit, then I have to pull the extension off like that, and then pull the spark plug socket out just because this is all one piece. If you had a swivel socket, then you wouldn't have to do that.

Okay, so to get this coil in, just slide this in position. I want to grab the plug, try to plug this in. You could try to take this bracket off, but it's very hard to get to those bottom two bolts on the bracket. Let's try sliding this down first. I'm lining this up. Okay, so that's lined up. I'm just going to make sure I lock it in place. So it seems like when you push the coil down, you can get that connector in. Just take a pocket screwdriver. You can remove these two nuts right here and then move those hoses a little bit if that helps you. And then push this connector on. Let me just make sure it locks down. And that's locked down. You can take your screwdriver and just double check. Make sure it's locked on there. And this one's good. So we're good, to tighten the bolt back down and we're good to go.

I just put a bungee cord to pull these hoses out of my way, so it's easier to work on. Just going to take this insulation pad, just slide this on like that. It's just going to sit there right there. Now I'm going to pull these rags out. It is a good idea when you pull these out just to look down the holes, make sure you didn't drop anything. Hopefully you didn't. And everything looks pretty good.

Alright, now I'm just going to take a pick that can get under the old gasket, slide it up. If there's some oil in there, you can clean it up. Just take a rag. You can always use a little brake parts cleaner. Just you're better off spraying it on the rag versus spraying it into the hole area because you don't want it to go down into the engine. Okay, so that's pretty clean. Take the new gasket, line it up, and just press it down. Then we'll do the same with the other ones.

Alright, with the intake, I'm just going to take a rag. Just wipe any of the oil off the intake here before we install it. Make sure there's no gasket material or anything on the edges and surfaces right here. That looks good. Now I'll take the plenum. We want to try to fold this underneath this little bracket right here, so you're just going to have to angle it like this. Get underneath that bracket. Make sure all the wires are out of your way. That's all lined up. Just wiggle it a little bit. Just going to get these started by hand.

Alright. I'm just going to snug these down with a eight millimeter socket extension and a ratchet. Now I'm going to use a torque wrench with the same eight millimeter socket. I'm going to torque these to seven and a half foot pounds. And you have to do it in a sequence, so you start with that back one. That's number one. Number two is right here, number three is right here, number four is this back one, number five, number six, and number seven.

I'm going to put the nuts over here, get this one started in this one. And I'll just take a 10 millimeter socket and ratchet and snug these up. It's good. That's good. Then I'll take my 13 millimeter socket and ratchet and I'm going to tighten the two studs up at the bottom of this bracket.

Now I'll take this bracket, install this, slide that in position, install the nuts. Before I tighten those down, we're just going to install these bolts down here.

Alright. I'm just snugging these up a little bit. I don't want these too tight and then I'm going to tighten up the nuts with a 10 millimeter socket and a ratchet. And I'll tighten these down, snug these down, and then go back and just tighten the other ones down a little bit. Alright. That's good and that's good.

Now we're going to put these two bolts in where this bracket is. Might have to pull the bracket to the side a little bit to get the holes to line up. Right, now I'll take my 10 millimeter socket and ratchet and tighten these down. Just snug. It is tightening into plastics, so be careful. Alright, at this point, I'm just going to put this insulation back here. Just slide that in position there.

Okay. We'll take these two brackets, get these started. They look like they're the same bracket and this one goes right here. We'll take a 10 millimeter socket and a ratchet. Snug these down. Do the same with this one. Let me just take this insulation, move it forward a little bit. Push these push retainers down. That's good. Alright, I'll take this bungee cord off. I'll take this pipe. This is going to go on the bottom. It's going to lock into there. I'm going to slide it on over here and then lock it in there. That's good.

This next one is going to go right here and right here. That's going to slide onto the air box right here. Alright, this last hose is going to go right here and right there. This line is going to go right here. And I'll take this wiring harness, this retainer is going to go in right there. Try to push that in there. Just like that. Push this one right here. Connect this connector right there. I'm going to connect this vacuum line right here. Just push that on.

There's some push retainers on this wire harness right here. Push those back down. Make sure that's nice and secure. Push this retainer right there. We're going to plug this connector in right here and lock this lock down. Take this retainer right here, slide that right on there.

Now we're going to slide this snorkel on. Get this in position. Let's connect the intake air temp sensor connector. Just lock that in place. You can slide the snorkel on that side and then slide it onto the air box. Just like that. Take a 10 millimeter socket and a ratchet, snug them down. Then we're going to tighten up these warm clamps with a straight blade screwdriver, just snug. Same with this one. And reposition this hose just like that. We're going to take this cover. These two slots are going to line up with those two pieces right there in the back, and then these are going to go into these little grommets right there and just push it down. Make sure it's nice and tight.

Now we'll take this negative cable, slide it on the battery. Take a 10 millimeter socket and a ratchet. Snug this up. Make sure you wiggle the cable, make sure it's nice and tight.

Thanks for watching. If you want the parts to do it yourself, check out 1aauto.com, the place for DIY auto repair.

Tools needed for replacement:

    General Tools

  • Pick

  • Materials, Fluids, and Supplies

  • Dielectric Grease
  • Paper Towels

  • Pliers, Cutters & misc Wrenches

  • Hose Pliers
  • Needle nose pliers

  • Ratchets & Related

  • Socket Extensions
  • Torque Wrench
  • Universal Joint
  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 8mm Socket
  • 10mm Socket

  • Sockets - SAE

  • 5/8 Inch Spark Plug Socket

  • Specialty Tools

  • Trim Tool Set


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