How hard is it to change plugs? - JeepForum.com
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post #1 of 16 Old 06-30-2008, 09:17 PM Thread Starter
magnum629
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How hard is it to change plugs?

I have 32,000 miles i think its time. Where are they i cant find them? 2005 4.0 thanks for any help.


khaki 2005 TJ 6 speed dana 30/35 4.10 gears 2 inch skyjacker BB lift 1 inch body lift 33 inch kumho mud TAs 15x8 mickey thom classic 2s wheels flowmaster 40 rear tube bumper
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post #2 of 16 Old 06-30-2008, 09:21 PM
Jerry Bransford
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I can't give you exact directions since my older TJ uses a conventional ignition like you're used to, but don't feel bad you can't find them as they are covered. They're on the passenger-side a couple inches under the valve cover and you have to remove the plastic shield to get to the ignition coil packs that are attached to each spark plug.

Someone with one of the newer distributorless ignitions like you have can give you more precise directions.

When you have a choice, buy American made.
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post #3 of 16 Old 06-30-2008, 09:49 PM
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post #4 of 16 Old 06-30-2008, 10:01 PM
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it's just 3 or 4 bolts to take your coil pack off and then it's the same as any other I6 just make sure when you put your coil pack back on you check each one to make sure it is seated. It took me just a few minutes to change them. Number six is a little bit of a pain so you need to put on a swivel on your socket. I used the Champion 7034 double platinum but Autolite makes a double platinum plug also, not sure on the numbers but you can ask Jerry he knows or just search it. Just make sure you don't use a single platinum plug, it's bad for our motors.

05 Unlimited 3" lift, 33" MT MTZ so far
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post #5 of 16 Old 07-01-2008, 08:56 AM
Jerry Bransford
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Quote:
Originally Posted by Chilly View Post
I used the Champion 7034 double platinum but Autolite makes a double platinum plug also
Autolite's part number is APP985. As Chilly says, if you want to extend your plug life 2-3X by going with platinum tipped plugs, the plugs must have platinum on both sides of the gap if you have a newer distributorless ignition system as the OP has. Either of the two above plugs would be good choices for the newer style distributorless engines. Older engines with distributors aren't so fussy.

When you have a choice, buy American made.
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post #6 of 16 Old 07-01-2008, 09:05 AM
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Yup, remove the coil pack and pull the plugs. About a 15 minute job.
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post #7 of 16 Old 07-01-2008, 09:31 AM
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I did mine the other day for the first time. It was very easy and I didnt have any problems getting to plug 6. This was a piece of cake compared to my f150.
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post #8 of 16 Old 07-01-2008, 09:41 AM
Jerry Bransford
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Quote:
Originally Posted by rebus20 View Post
This was a piece of cake compared to my f150.
My friend has an '89 Lexus LS400 and you have to lift the engine up off the mounts to change its plugs. At least it could easily go 100K miles before it needed plugs and to their credit, Lexus fixed that issue on later models.

When you have a choice, buy American made.
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post #9 of 16 Old 07-01-2008, 10:07 AM
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Jeep Inline 6 is probably one of the easiest to change. I changed my friends Exterra and that was a nightmare.
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post #10 of 16 Old 07-01-2008, 11:39 AM
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Yep, did mine last weekend and it was a snap (once I got the right size plug wrench!). Follow Stu's instructions and you won't have any problems, and Amazon.com has the Autolite APP985 plugs. I strongly recommend you order them from Amazon, I got a great deal on the ones I got!

Cheers! M2
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post #11 of 16 Old 07-01-2008, 11:42 AM
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Quote:
Originally Posted by UrbanGator View Post
Jeep Inline 6 is probably one of the easiest to change. I changed my friends Exterra and that was a nightmare.
Takes me only 2/3rds as long.

Yeah, I have a 4 banger...
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post #12 of 16 Old 07-01-2008, 11:53 AM
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Thanks for the link. I'll definitely bookmark that when I get home from work.

Quote:
Originally Posted by M2LJ View Post
Yep, did mine last weekend and it was a snap (once I got the right size plug wrench!). Follow Stu's instructions and you won't have any problems, and Amazon.com has the Autolite APP985 plugs. I strongly recommend you order them from Amazon, I got a great deal on the ones I got!

Cheers! M2

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I get it... The Wife told you to get a hardtop, so you told her you would trade your soft top to a guy with a hard top. By the time someone bites the baby will be old enough to ride up front, problem solved. Smart move.
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post #13 of 16 Old 07-01-2008, 01:09 PM
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Yeah, i just changed my plugs yesterday, and it was a piece of cake.

Besides my plugs being slightly seized in (They were the original ones from 50K miles ago!), and needing a cheater bar on the ratchet, it went off without a hitch.

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post #14 of 16 Old 07-01-2008, 01:24 PM
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Definately go with the APP985s, the idiot at the store I bought my plugs at about a month and a half ago gave me AP985s by mistake. I didn't notice and the engine started stumbling from just off idle and backfiring under a load to about 1800RPM after less than 3K miles.

I thought it could have also been a bad TPS but pulled the plugs and found that they were the APs. Replaced in the APP, and all is wonderful again. (Hopefully that was all it was and the new plugs aren't masking something else.)

Speed costs money, how slow do you want to go?
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post #15 of 16 Old 07-01-2008, 02:14 PM Thread Starter
magnum629
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Thanks guys ill get the good plugs this week and change them myself! Thanks agian.

khaki 2005 TJ 6 speed dana 30/35 4.10 gears 2 inch skyjacker BB lift 1 inch body lift 33 inch kumho mud TAs 15x8 mickey thom classic 2s wheels flowmaster 40 rear tube bumper
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