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Old 11-25-2015, 09:19 PM
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JK engine question

I have a 2004 Sahara and looking at a 2012 Sahara. I have noticed comments on here about the first V-6 was a Minivan motor and not very good. Does the 2012 Wrangler have that motor or a better one? Thanks in advance.

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Old 11-25-2015, 09:32 PM   #2
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They went to the 3.6 in 2012, it's alot better motor than the 3.8 it replaced. They did have a fee issues with the 3.6 in 2012 but it was cleared up in 2013.

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Old 11-25-2015, 10:01 PM
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Originally Posted by AZ01TJ View Post
They went to the 3.6 in 2012, it's alot better motor than the 3.8 it replaced. They did have a fee issues with the 3.6 in 2012 but it was cleared up in 2013.
What kind of issues and was there a recall or fix? This one has 25,000 miles on it.
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Old 11-25-2015, 11:24 PM   #4
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What kind of issues and was there a recall or fix? This one has 25,000 miles on it.
The main one was a tapping that led to the driver side head having to be replaced. I think most of the 2012s with this problem have had it fixed by now. It was cleared up late in the model year supposedly. I have a 2013 for this reason. The 3.6L Pentastar is a LOT better than the 3.8L used from '07 through '11.

Check into this one. Get the manufacture date and ask around. Directly ask the owner whether he had this work done to his. He may say no, but in all honesty it probably did not have the problem. It was not widespread, but you need to know about it if you are seriously looking at a '12. Read: it is most likely fine.

Search for reports on 2012 head issues.

Good luck!
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Old 11-25-2015, 11:26 PM   #5
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I think it was some kind of head issue. You would have to double check with the JK guys.
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Old 11-27-2015, 11:50 AM   #6
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the new 3.6 has 80 HP more (although you have to gun it to get at it). Also has a better auto transmission NAG1/ WA580 5spd. Its a Mercedes transmission and used on early HEMI engines too. One thing i dont like is the coolant lines for the tranny are totally exposed under the jeep. I got the after market Rubicon express transmission skid plate to solve that.
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Old 11-27-2015, 02:01 PM   #7
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One thing i dont like is the coolant lines for the tranny are totally exposed under the jeep.
Yeah, the JK is much better than the TJ - bone stock - in many regards. Then you see STUPID engineering like this and shake your head. It is more capable but not as rugged? Seriously? Hello, Jeep!

My JK can out drive my TJ in side-by-side runs when both are bone stock, but not by much can it do this. Both are seemingly infinitely upgradable. The TJ - FOR ME - is the better vehicle because of the simplicity of the 4.0L to do real work on, as well as several things that make the TJ either more rugged or that are so cheap that you do not really care if you mess them up.

The JK has all sorts of little issues like the tranny lines being exposed, having to cut out the front "crash bar" (a sort of frame crossmember on the front edge) to fit certain bumpers, etc., that make it feel less rugged than the more spartan TJ, and that very spartan feel is a plus, too, if you tend to trash your jeep in the mud or whatever. The JK scares me because it cost me well over $30K! I am actually afraid to wheel it when I have my beater TJ sitting next to it in the driveway.

Because of this the fun factor for the TJ is still higher, too.

But that 3.6L Pentastar engine - woo-hoo, baby! I prefer working on the 4.0L, but that 3.6L can be fun to drive!

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