2006 LJ V8 advice needed. - JeepForum.com
 
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post #1 of 14 Old 06-10-2019, 08:09 PM Thread Starter
CWH2019
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2006 LJ V8 advice needed.

Ive got the dreaded PCM Issues, enough said right? Well ive come to terms that the only true fix for this is to just swap in a V8. I would like to go with a 5.2/5.9 magnum due to the availability and cheap donor prices. Problem is, with the little research ive done my PCU buss isn’t compatible with any of the 5.2/5.9 donor engine buss’s. I would like to utilize all my original dash stuff. Has anyone in here put a 5.2 or 5.9 in a jeep newer then 2002 or 2003 or whatever the last year TJ was that had the same PCM buss as the donor 5.2/5.9?

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post #2 of 14 Old 06-11-2019, 08:59 AM
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although I have not put a 5.2/5.9 in my LJ, I just swapped in an LS.

Used my stock gauges and everything works on it. Had to use a Novak TACH emulator for the Tach and Oil pressure to work. Speedometer worked as it did before off my Tcase. I am using a GM computer and the original Jeep computer to run stock gauges.

2006 LJR...the madness begins again
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post #3 of 14 Old 06-11-2019, 11:58 AM
Wheelin98TJ
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There are some 5.9L drivetrains that use PCI Bus communication.

http://www.hotwireauto.com/?page=mopar-eng
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post #4 of 14 Old 06-11-2019, 04:12 PM Thread Starter
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Originally Posted by Wheelin98TJ View Post
There are some 5.9L drivetrains that use PCI Bus communication.

http://www.hotwireauto.com/?page=mopar-eng

I've looked at this website page already. From what I've figured out is the PCM's from the PCI buss donors don't have the same harness clips that the 2006 jeep has. From what I gathered, most people use the jeep harness but use the donor PCM all from the same year. this way the harness clips are the same, making the swap pretty easy besides re-pinning a few things that the V8 needs. I'm limited to 2001-2003 RAM,Durango,and Dakota as far as PCI buss's go. If the Buss's match does it matter if the PCM harness clips are different? I would have to use the donor PCM and the donor harness and all four donor PCM Harness clips would have to be re-pinned. This isn't going to be easy if at all possible. The chance that all the jeep stuff that goes to the factory jeep PCM being able to be re-pinned into the Donor PCM is scaring me. Especially since the donor years for the PCI Buss don't match my year Jeep. I guess I will need to get the factory service manuals for 2006 Jeep wrangler unlimited 4.0, automatic and the FSM's for a couple of the donor year PCI buss vehicles and see how close the entire PCM's match up as far as all the circuits for every PCM harness plug.

I wish I could find someone that has done a magnum swap in a newer 2005-2006 wrangler.
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post #5 of 14 Old 06-12-2019, 08:26 AM
Wheelin98TJ
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I wouldn't worry about the plugs being different. Cut and splice.

Take the donor harness and splice in the TJ harness where you need it.
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post #6 of 14 Old 06-12-2019, 10:31 AM
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Quote:
Originally Posted by CWH2019 View Post
Ive got the dreaded PCM Issues, enough said right? Well ive come to terms that the only true fix for this is to just swap in a V8. I would like to go with a 5.2/5.9 magnum due to the availability and cheap donor prices. Problem is, with the little research ive done my PCU buss isnít compatible with any of the 5.2/5.9 donor engine bussís.

Not necessarily so. I have done some research on this relating to the lack of PCM fixes (like what you are apparently experiencing) on the í05-í06 TJs. I find that the NGC PCMs for some, if not all Chrysler models, match the TJs. They have the same 38 pin connectors & common circuits use the same pin locations & non-common ones use pins that are unused on other models. Of course the programming is different, model specific.


While some of the later NGC PCMs do have CAN bus & you want PCI bus, the PCM connectors should match your 2006. And more to the point there are some NGC PCM equipped year models that also have PCI bus.

In the Hotwire link above I donít see any 5.2s with PCI but some 5.9s.

For example a 2005 Ram has PCI bus & NGC PCM. All of the common components appear to match the Ď05/í06 TJs. I have the pin outs for 2005 Ram & assume the 2002-2003 Ram (PCI & 5.9) would be the same.
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post #7 of 14 Old 06-12-2019, 11:01 PM
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While I understand your reasoning for wanting the Magnum motor, just be aware that your 06 is a prime candidate for a 5.7 Hemi/545RFE swap. Your gauges, fuel system, evap system, and so on can be left untouched. Add a 4 cylinder steering block, AA motor mounts, a Hotwire harness, suitable radiator , 05 5.7 GC exhaust manifolds, and a few other small things ( that youíd have to do regardless)and youíre basically there. You already have a 44 rear and the 30 will do with upgraded shafts.

Just a thought.. PM me if you want details or have questions

'98 TJ, 5.7 HEMI,
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post #8 of 14 Old 06-14-2019, 03:35 AM Thread Starter
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I thought about the Hemi for about a minute until i saw the $1755 price for just the harness alone!

This is why i want to go the magnum route. Seems that after parting out the donor vehicle and doing my own wiring harness work. The whole job shouldnt cost me more then $2000 to $3000
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post #9 of 14 Old 06-14-2019, 09:52 AM
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Quote:
Originally Posted by CWH2019 View Post
I thought about the Hemi for about a minute until i saw the $1755 price for just the harness alone!

This is why i want to go the magnum route. Seems that after parting out the donor vehicle and doing my own wiring harness work. The whole job shouldnt cost me more then $2000 to $3000
Yea... never said it would be cheap! But the HotWire harness is a work if art and fit perfectly. It was worth it for me to go that route. I also have emissions to deal with and had to make it 50 state legal.

'98 TJ, 5.7 HEMI,
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post #10 of 14 Old 06-14-2019, 09:55 AM
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Quote:
Originally Posted by CWH2019 View Post
I thought about the Hemi for about a minute until i saw the $1755 price for just the harness alone!

This is why i want to go the magnum route. Seems that after parting out the donor vehicle and doing my own wiring harness work. The whole job shouldnt cost me more then $2000 to $3000
The harness is a bit of a PITA. I spent a lot of hours looking at FSMs, stripping wires, patching wires, going back to the FSMs, etc.

Having a plug and play harness is a huge time saver.
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post #11 of 14 Old 06-14-2019, 11:13 PM Thread Starter
CWH2019
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Originally Posted by Wheelin98TJ View Post
The harness is a bit of a PITA. I spent a lot of hours looking at FSMs, stripping wires, patching wires, going back to the FSMs, etc.

Having a plug and play harness is a huge time saver.


Yeah but is it worth $1800! Man that's a lot of dough. Did you do a Hemi or a Magnum?
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post #12 of 14 Old 06-14-2019, 11:15 PM Thread Starter
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Originally Posted by sduncan View Post
Yea... never said it would be cheap! But the HotWire harness is a work if art and fit perfectly. It was worth it for me to go that route. I also have emissions to deal with and had to make it 50 state legal.

PM sent!
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post #13 of 14 Old 06-17-2019, 07:16 AM
Wheelin98TJ
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Yeah but is it worth $1800! Man that's a lot of dough. Did you do a Hemi or a Magnum?
Kind of a Hemi. 4.7 V8.
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post #14 of 14 Old 06-17-2019, 10:29 PM
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Originally Posted by Wheelin98TJ View Post
Kind of a Hemi. 4.7 V8.
You still havenít swapped the baby Hemi out??!

Cmon man!!

'98 TJ, 5.7 HEMI,
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