Purchasing a 2012 or newer JK, Any powertrain problems? - JeepForum.com
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post #1 of 5 Old 09-26-2013, 11:23 AM Thread Starter
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Purchasing a 2012 or newer JK, Any powertrain problems?

Hello guys,

I'm in the market for a 2012 or newer JK. I sold my 2008 JK due to oil consumption and was wondering if there are any known engine or transmissions problems with the new powertrain?

Thank you,


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post #2 of 5 Old 09-26-2013, 01:06 PM
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Read this thread and then search for Pentastar Head Problems...

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post #3 of 5 Old 09-26-2013, 01:37 PM Thread Starter
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Thank you RockyClymer. I believe I will stay away from the 2012 models and focus on the 2013.
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post #4 of 5 Old 09-26-2013, 02:23 PM
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watch that too; early 13"s have had the same issue I have read. and none of the "fixed ones" have had enough time to say for sure. I had a left bank replaced last week at 20k. trouble is no one knows really knows. I wonder if Chrysler even does. trouble with that is those are the latest heads too. I would get a long warranty. Last Chrysler said is was a combination of bad gas/ driver. We know since the failures are all over the nation one cant say all gas is bad.............

I can say with out doubt the new head is much smoother sounding and netted 1.5 mpg in town. Dealer took a week to get the needed parts and time. The were more than nice about it. My Jeep is a DD and a Club Jeep so it looks like what I use it for 3+ lift 35"s armor... lots of scratches few dents topless door less. They even cleaned it! I figure one day after the heart of this horse dies(or runs out of warranty) I have a 5.3 and a 6L80e in plan. With paddle **** on the column. about the same weight v8 equal mpg. Wont spit out valves that are NOT serviceable. Fact is unless the after market come out with a better head. As I am one that thinks the issue is from the casted into the head exhaust manifold. It is transferring to much heat to the center area of the heads. I think this is why they are burning exhaust valves. The Jk just showed the flaw. They used this motor in Grand before this and it had other issues then, they fixed.

Anyone make a CNC head for this mouse motor? with just exhaust PORTS. Think there may be a market here. Naw I would still go chev heck you can get crashed 1500 with about all you need for the cost of two heads.

By the way in the Mini Van forum, yes they have one good gawd. . Pents seems to go out at longer interval more in the 40K...................

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post #5 of 5 Old 09-26-2013, 03:14 PM
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Where are you reading about '13s with the same problem?

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