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Unread 12-04-2013, 06:58 AM   #31
tripster_sta
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Found a pristine '93 Cherokee at a pick-n-pull in Baton Rouge when I was home on leave and pulled the cylinder head #7120, harness, alt, intake manifold, throttle body and cable, dizzy, and coil. For only 380 doll hairs
The exhaust manifold was cracked, go figure. Guess I'll have to pick up a Gale Banks Revolver Exhaust Manifold

Question for those wiring gurus, the wiring harness from the Cherokee was 2wd so does this mean it will not work with the D20 speedo?

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Unread 12-04-2013, 07:00 AM   #32
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Quote:
Originally Posted by W7NB View Post
I did the 4.0 HO swap (From a 91) in my CJ. I bought a wrecked Cherokee for $550 bucks and sold the parts I didn't need for $500, so an engine and tranny for $50 seems like a pretty good deal. I bought the Hesco wiring harness for ~ $500 which made the install pretty much plug and play. Since it's a newer motor and I installed it wit all the factory emission stuff it should pass the test in California.
Did you swap the whole thing or just the head?
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Unread 12-04-2013, 09:13 PM   #33
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Quote:
Originally Posted by tripster_sta View Post
Found a pristine '93 Cherokee at a pick-n-pull in Baton Rouge when I was home on leave and pulled the cylinder head #7120, harness, alt, intake manifold, throttle body and cable, dizzy, and coil. For only 380 doll hairs
The exhaust manifold was cracked, go figure. Guess I'll have to pick up a Gale Banks Revolver Exhaust Manifold

Question for those wiring gurus, the wiring harness from the Cherokee was 2wd so does this mean it will not work with the D20 speedo?
This is the thread I made when I did my 4.0 Swap. I also used an ax15 tranny so I didnt have to use the cps relocation kit from hesco.http://www.jeep-cj.com/forums/f2/4-0...82-258-a-5083/

For the speedo on your D20, assuming that the cable is the same threading as the d300 you will need to find a VSS from a 91 YJ. It is a hybrid between electric and mechanical. it will supply your ECM the signal and turn your your mechanical speedo cable.
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Unread 12-04-2013, 10:04 PM   #34
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Quote:
Originally Posted by ThisGuyUKnow View Post

This is the thread I made when I did my 4.0 Swap. I also used an ax15 tranny so I didnt have to use the cps relocation kit from hesco.http://www.jeep-cj.com/forums/f2/4-0...82-258-a-5083/

For the speedo on your D20, assuming that the cable is the same threading as the d300 you will need to find a VSS from a 91 YJ. It is a hybrid between electric and mechanical. it will supply your ECM the signal and turn your your mechanical speedo cable.
I've read through your thread multiple times, very nice work, I love the serp belt.

So here is my part list. I was under the assumption that if I had the hesco speed sensor I wouldn't need the vss from a 91 yj.

Sent from toilet at work
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Unread 12-04-2013, 10:09 PM   #35
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Oh and also the high pressure fuel pump, and have the exhaust system fabed, there I go assuming stuff.

Sent from toilet at work
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Unread 12-08-2013, 12:25 PM   #36
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I did the 4.0 head swap and MPFI upgrade a few years ago, and I can't tell you how pleased I've been with the resulting improvements in performance and reliability.
With all due respect to all the KISS-principle types, I sympathize but consider this to be a most worthwhile concession to electronic technology.

And let me point out that I am an attorney, not a mechanic. I have at best intermediate skills (a lot more now than when I started!) and was able to do this with the help of this forum.
Also, YouTube videos are really helpful in learning how things go together and work.

To save time and hassle I used the HESCO harnes and TPS kit, but if I did it again in future I'd probably just pull a 4.0 flywheel and try to strip down an OEM harness.

You can get anything you need from a good junkyard. Some say the parts are drying up, but you aren't limited to Wranglers; Grand Cherokees have the same parts and there are tons of those in my area.
I'm lucky to have a Chrysler-only lot very near me, but their prices are higher so I've mostly gotten specific parts from there that had to come from a YJ, such as steering column and power brake booster.

Most of the parts for my MPFI upgrade came from a group 93, 94 and & 95 GCs in one you-pull-it yard.

As to HESCO, they really are the experts but they're also proud of their stuff.
For example, their ECM is almost $500 while the yard charged me $27. The only difference is that the HESCO part has some trouble codes disabled so your check engine light doesn't stay lit.

There are a few hinky bits you'll have to search for, such as a speed sensor that has both mechanical and electronic capability.
Mine came from a 91 J10 pickup and cost less than $10.

I could go on all day, but there are tons of threads on this subject around here.

That said, feel free to PM me with specific questions if you need input from a rank amateur who took this on.
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Unread 12-09-2013, 04:26 AM   #37
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The '91 YJ VSS part sucks because I cant find that particular jeep in my neck of the woods and brand new they are in the ball park of $100

It's like I'm in a hole and the only way out is to dig deeper
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Unread 12-09-2013, 05:08 AM   #38
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Quote:
Originally Posted by Colt44 View Post
I did the 4.0 head swap and MPFI upgrade a few years ago, and I can't tell you how pleased I've been with the resulting improvements in performance and reliability.
With all due respect to all the KISS-principle types, I sympathize but consider this to be a most worthwhile concession to electronic technology.

And let me point out that I am an attorney, not a mechanic. I have at best intermediate skills (a lot more now than when I started!) and was able to do this with the help of this forum.
Also, YouTube videos are really helpful in learning how things go together and work.

To save time and hassle I used the HESCO harnes and TPS kit, but if I did it again in future I'd probably just pull a 4.0 flywheel and try to strip down an OEM harness.

You can get anything you need from a good junkyard. Some say the parts are drying up, but you aren't limited to Wranglers; Grand Cherokees have the same parts and there are tons of those in my area.
I'm lucky to have a Chrysler-only lot very near me, but their prices are higher so I've mostly gotten specific parts from there that had to come from a YJ, such as steering column and power brake booster.

Most of the parts for my MPFI upgrade came from a group 93, 94 and & 95 GCs in one you-pull-it yard.

As to HESCO, they really are the experts but they're also proud of their stuff.
For example, their ECM is almost $500 while the yard charged me $27. The only difference is that the HESCO part has some trouble codes disabled so your check engine light doesn't stay lit.

There are a few hinky bits you'll have to search for, such as a speed sensor that has both mechanical and electronic capability.
Mine came from a 91 J10 pickup and cost less than $10.

I could go on all day, but there are tons of threads on this subject around here.

That said, feel free to PM me with specific questions if you need input from a rank amateur who took this on.
I've read through your thread and I like the nice work with the exhaust manifold. I, like you, am a shadetree mechanic and am looking for all the help I can get. I really appreciate the help.

Upon futher research the 91 YJ VSS is not needed if I just get the HESCO Speed Sensor#HES7015 and its connector #4414048 for a whooping $149.45 +tax of course. Now if a $10 vss just fell into my lap that would be preferred, but I can't have all the luck.
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Unread 12-09-2013, 10:03 AM   #39
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Late 80's dakota vss works. I bought anew one for $30 on ebay
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Unread 12-09-2013, 10:48 AM   #40
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Originally Posted by Gigemags05 View Post
Late 80's dakota vss works. I bought anew one for $30 on ebay
Found one for $35, thanks. I didn't know they were the same. Good call.
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Unread 12-09-2013, 10:54 AM   #41
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No problem. Mine has been fine for 6 months or so since I've done the swap.
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Unread 12-09-2013, 11:13 AM   #42
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Originally Posted by tripster_sta View Post
Found one for $35, thanks. I didn't know they were the same. Good call.
Good, glad you found one. Not from Hesco, I hope?

I said J10, couldn't remember the name Dakota.
I think mine was 5 or 10 bucks.
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Unread 08-11-2014, 04:19 PM   #43
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Well gents I finally gave in to the head swap and fuel injection. After repeated fails at the smog station and money down the drain, I threw in the towel. So here is my progress thus far.
Everything removed down to the block.
Here is a shot of the new and old head.
Biodegradable packing peanuts and some JB Weld.
I'm just waiting on the epoxy to cure then I'll lap the valves, reassemble the head, slap it on, hook everything up, and then to the fun part of wiring everything
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Unread 08-11-2014, 04:24 PM   #44
jeepwhore
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Correct me if I'm wrong, but don't you need to use a CARB certified kit to pass CA emissions? I didn't think you could pass by doing a JY head swap?
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Unread 08-11-2014, 04:31 PM   #45
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From my understanding of the CARB directives is that any modifications done to an engine has to either be approved by the CARB and have a sticker with a number, or it has to be approved by a referee. Some material that I read states that the modifications, in my case, has be from a newer engine and meet the requirements of that vehicle. I.e. check engine light, catalytic converter, and so on. Correct me if I'm wrong.
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