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Unread 09-21-2009, 11:37 AM   #16
schmie
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alright, thats some useful info. thanks. what would have to be done to the stock pcm to hook in those knock sensors? can i have it reflashed? or look for an ho pcm?

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Unread 09-21-2009, 12:21 PM   #17
rm2001wj
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You can't have you 2000 PCM reflashed because it doesn't even have a place to connect knock sensors. An HO PCM might be possible but then you would need a complete wiring harness from the same HO which would replace your 2000 harness. Finally, there are some subtle differences between a 2002 or later HO PCM/harness and 2000 devices like TCM and BCM.

I personally know of one person, an electrical engineer, who did this, but he never did get things to work in a way that let the CEL turn off.

IMO, trying to get the HO correctly installed would not be worth the time and effort.
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Unread 09-21-2009, 12:22 PM   #18
xJoshxx
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buy a 4.7 and put a 4.7HO internals?
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Unread 09-21-2009, 11:28 PM   #19
ronsaun
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you are buying trouble with this idea! put in a ccompletely compatible motor unless you have weeks to screw around and a bottomless wallet.
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Unread 09-21-2009, 11:41 PM   #20
iluvtruenos
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Actually, simply buying the HO camshafts and intake nets a 30hp gain.

The Dakota guys do it all the time.
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Unread 09-22-2009, 07:13 AM   #21
CanadianZed-J
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Quote:
Originally Posted by ronsaun View Post
you are buying trouble with this idea! put in a ccompletely compatible motor unless you have weeks to screw around and a bottomless wallet.

The impression I got from rm2001wj is that it's really no problem as long as you forget about the knock sensors and only run premium.

Did I understand correctly? With the high mileage on my 4.7 (195K miles) I'd like to work out my game plan in advance should it eventually go south. An HO would be cool, (even having to run premium all the time), but I sure wouldn't want to run into a mess of electrical crap and a permanent CEL.



Quote:
Originally Posted by iluvtruenos View Post
Actually, simply buying the HO camshafts and intake nets a 30hp gain.

The Dakota guys do it all the time.

I can't get onto WJJeeps.com right now, but there are other enhancements done to beef up the HOs to provide reliability with the added power. And in this case, the OP blew his engine (but I know what you're saying).




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So I installed the flux capacitor but the Jeep just won't do 88 mph.

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Unread 09-22-2009, 07:19 AM   #22
the88thpianoman
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Quote:
Originally Posted by CanadianZed-J View Post
The impression I got from rm2001wj is that it's really no problem as long as you forget about the knock sensors and only run premium.

Did I understand correctly? With the high mileage on my 4.7 (195K miles) I'd like to work out my game plan in advance should it eventually go south. An HO would be cool, (even having to run premium all the time), but I sure wouldn't want to run into a mess of electrical crap and a permanent CEL.






I can't get onto WJJeeps.com right now, but there are other enhancements done to beef up the HOs to provide reliability with the added power. And in this case, the OP blew his engine (but I know what you're saying).




CZJ.
Why not just get an HO upgrade kit? Includes all of the internals to upgrade the standard 4.7 to the HO, and then if yours kicks the bucket, just rebuild it instead of dropping a ton of money on another engine altogether.
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Unread 09-22-2009, 07:31 AM   #23
CanadianZed-J
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Quote:
Originally Posted by the88thpianoman View Post
Why not just get an HO upgrade kit? Includes all of the internals to upgrade the standard 4.7 to the HO, and then if yours kicks the bucket, just rebuild it instead of dropping a ton of money on another engine altogether.


From what I've researched on this site, guys are paying in the neighbourhood of $5000 US to have their 4.7s rebuilt (no, I wouldn't trust myself to rebuild it myself and wouldn't have the time anyway). I'm not sure what a wrecking yard 4.7 costs but I am sure it's far less than that. Also, my uncle owns a body shop/used car dealership so could pick me up a wrecked-in-the-rear WJ at auction for dirt cheap. I swap the engine (I'll do this myself), swap any other things I'd like, then part it out and recoup some of the costs.

This brings me to another point. I'll bet a used car dealership can get you a wrecked WJ with a good motor too. No idea if they'll do this for anyone off the street, but I can't see why not. You can go tell them what kind of car you're looking for and they can buy one at auction for you. It's no different from how they get the rest of their cars on their lots.



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So I installed the flux capacitor but the Jeep just won't do 88 mph.

-'99 WJ Limited, 4.7, Patriot Blue, 2" BB, 31" Mall-Terrains, Pavement Princess
-'97 TJ, Stone White, 4" Superlift, 33" SSRs, lunchboxed rear, 12K Titan winch, and 2.5 litres of exhillirating performance.
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Unread 09-22-2009, 10:51 AM   #24
rm2001wj
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Quote:
Originally Posted by CanadianZed-J View Post
The impression I got from rm2001wj is that it's really no problem as long as you forget about the knock sensors and only run premium.

Did I understand correctly? With the high mileage on my 4.7 (195K miles) I'd like to work out my game plan in advance should it eventually go south. An HO would be cool, (even having to run premium all the time), but I sure wouldn't want to run into a mess of electrical crap and a permanent CEL.

..........


..........

CZJ.
About the only thing that might keep this swap from working would be differences between the crankshaft tone ring (for CKP sensor) and camshaft tone ring (for CMP sensor) for the regular 4.7 and the 4.7 HO. I believe that there are differences for some model years, and you would need to confirm that the tones rings are the same for your 4.7 and the proposed 4.7 HO.

If necessarily, the HO camshaft tone ring could probably be changed relatively easily, but I not so sure about the crankshaft tone ring.
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Unread 09-22-2009, 03:06 PM   #25
dougy147
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Quote:
Originally Posted by CanadianZed-J View Post
From what I've researched on this site, guys are paying in the neighbourhood of $5000 US to have their 4.7s rebuilt (no, I wouldn't trust myself to rebuild it myself and wouldn't have the time anyway). I'm not sure what a wrecking yard 4.7 costs but I am sure it's far less than that.
It will be less, but it might cost all of half of that to get a decent one with 60k miles or so. I thought about getting a JY engine when one of my 4.7 heads cracked. I was looking at almost 2k if I remember correctly for one with 90k miles. I decided to suck it up and spend the 1,000 on heads and misc. parts and a few weekends beating on my jeep.
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Unread 09-22-2009, 11:26 PM   #26
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What about the idea of just dropping the new heads on an old 4.7 block?
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