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  #13  
Old 08-28-2010, 02:23 PM
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Re: 02 WJ 4.7 Re-Build/Upgrade

Ok, this has taken WAY TOO LONG to get moving again on my part but money and lack of parts around here have killed me. The good news is I was able to find and buy an 02 4.7 H.O. with 100k on it. I am wondering if I bought a new PCM on ebay, I did for my old motor and it worked great, if I could have them just program it to recognize the H.O. motor. I have emailed a vendor. Will post response here. I am going to go through the new.old motor because of it's mileage but it should be a great foundation to build upon! $1500 too!! Now...How about Ryan's upgrades on this puppy?
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Old 08-28-2010, 02:35 PM
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Re: 02 WJ 4.7 Re-Build/Upgrade

See my sig
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Old 09-20-2010, 02:14 PM
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Re: 02 WJ 4.7 Re-Build/Upgrade

The PCM is my only real issue here. The new motor has a 16 tooth tone wheel like the old non-H.O. did so no issue there. My problem I can't seem to wrap my head around is the PCM. I have the VIN of the vehicle my replacement motor came from but they no longer had the PCM. In fact they literally cut the wiring harness and yanked the motor. IF I buy a PCM programmed to the motor VIN thus working properly with the H.O. sensors, I know my ignition keys will not work unless programmed to the same VIN. Not likely to get a dealer to do that. If I keep the stock PCM I have I lose what? I know it's not designed for 2 knock sensors but from what I've read I can use 89 octane or better fuel to make that a non-issue. Any other Real issues you guys have come across? Thanks so much for your help here. I am ready to shop for bearings etc and give this motor a once over and get..it..installed!
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Old 09-21-2010, 09:18 PM
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i found a SET of preformance headers for 307$ not shipped. im considering getting some for my wj. omix torque tube headers
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  #17  
Old 09-21-2010, 09:21 PM
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Re: 02 WJ 4.7 Re-Build/Upgrade

I know which headers you're talking about, they're only for the straight 6 not the V8.
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Old 09-22-2010, 02:23 AM
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Re: 02 WJ 4.7 Re-Build/Upgrade

Quote:
Originally Posted by Kokomo_Jeep_Guy View Post
The PCM is my only real issue here. The new motor has a 16 tooth tone wheel like the old non-H.O. did so no issue there. My problem I can't seem to wrap my head around is the PCM. I have the VIN of the vehicle my replacement motor came from but they no longer had the PCM. In fact they literally cut the wiring harness and yanked the motor. IF I buy a PCM programmed to the motor VIN thus working properly with the H.O. sensors, I know my ignition keys will not work unless programmed to the same VIN. Not likely to get a dealer to do that. If I keep the stock PCM I have I lose what? I know it's not designed for 2 knock sensors but from what I've read I can use 89 octane or better fuel to make that a non-issue. Any other Real issues you guys have come across? Thanks so much for your help here. I am ready to shop for bearings etc and give this motor a once over and get..it..installed!

Google Brian Stroud. There is a JU thread. he swapped a HO motor in and made it work on a NON-HO PCM. I believe I remember him saying that there is provisions in the Non-HO harness for the knock sensors.
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Old 09-24-2010, 06:17 PM
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Re: 02 WJ 4.7 Re-Build/Upgrade

Bookmarking this thread. Great info here guys!
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Old 09-24-2010, 08:18 PM
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Re: 02 WJ 4.7 Re-Build/Upgrade

Thanks Sleepy!

Looks like Brian had some real issues but it looks like he had some year to year differences in addition to the HO - non HO changeover. I will follow him to see how it all works out. I am same year here and gonna try his basic experiment of using my current PCM with the HO motor. I don't wanna have to buy new keys and Try to get someone to program them to engine VIN and not vehicle VIN. Then hope the A/C and other accessories work still. Taking from what you guys have said throughout this I will plan on running 89 or better fuel. Now just waiting on rebuild kit to get here. Will post back when I have some progress. Thanks all!
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Old 10-03-2010, 07:32 PM
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Re: 02 WJ 4.7 Re-Build/Upgrade

Any new updates or progress?
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  #22  
Old 10-04-2010, 10:02 AM
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Re: 02 WJ 4.7 Re-Build/Upgrade

I am replacing gaskets on HO motor this week and pulling old motor next. Sorry so slow. Believe me I am anxious to get my Jeep back!
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Old 10-04-2010, 03:27 PM
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Re: 02 WJ 4.7 Re-Build/Upgrade

Sweet, I hope to one day have the $$ to do the HO cams and other necessary parts to get my 4.7 up to 4.7 HO specs. Then i am getting a 4.7HO badge for the lift gate!
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Old 01-13-2011, 09:26 AM
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Re: 02 WJ 4.7 Re-Build/Upgrade

Think it's about time for an update?!? Me too!

It's in. After almost a year of delays due mostly to money it is in. I was afraid to turn the key knowing it would only be the beginning of a painstaking troubleshooting nightmare. Battery charged, key in the ignition...one, two, three seconds later its running perfectly!

I just could not believe it. The brake rotors had rusted terribly and the tires had even lost air but this darn H.O. motor roared to life. That was 2 days ago. I've put 85 miles on it, stopping frequently to check fluids and check for leaks or odd sounds and smells. So far so good. I know I shouldn't have but I gunned it a cpl times and it is greatly more responsive than ever. I have been driving my wife's 2005 Liberty with a V6 which is nice but definately not THIS. I will upload some pics too.

I did fill up on gas before the last motor blew so I added a bottle of octane booster to this tank 2 days before trying to start it. Seemed to work. No knocks. I put a K&N filter with a homemade pipe instead of the stock and opted for a set of Pulstar Iridium plugs which are $20 each almost everywhere but found on Amazon.com of all places for half that.

Will add more later. Sorry for the delay and thanks for all the support. Any advice on replacing the stock exhaust?
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