Greg@RME

Long story short, my 2012 JKU needs an engine.... the previous owners neglected to ensure that the air box was properly sealed & quite a bit of Moab dirt & sand (it was a rental Jeep in Moab before I had it) found their way into the engine. I had some recent work done on the engine and found that the cross-hatching is nearly non-existent on the cyl. walls, plus it feels down on power. There is no question that the engine is wounded.

While I would love to do an LS swap, my plans are to sell this thing when the JT diesel is out... so I don't want a bunch of money tied up in an engine swap when I won't get it back. My plan is to swap another Pentastar engine back into the Jeep, but I'm wondering if the newer engines will work in a 2012? Will a 2015+ engine work with my ECM? Any other changes to be aware of? I'm planning to buy an engine either from a wrecked JK or perhaps one that was pulled for a V8 swap.

Anything else I should know about stock to stock swaps? I'm hoping I can get a complete engine with all accessories, wiring harness and ECM.

Greg@RME

Doing some reading, it looks like the oil filter is different....


Still unsure about the ECM.....

kejtar

Since ECM reads sensors unless sensor holes are different and you can't remount your existing ones you should be fine.

Greg@RME

Yeah, I don't believe there were any changes in the Pentastar over the years.... but rather than guess, I sure would like to have conformation from someone that either knows first-hand or has swapped a newer engine into an older 2012 JK.

KCoupe

There’s a guy on YouTube that swapped a 2015 into a 2012.