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Old 08-15-2019, 11:14 PM
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Yj getting ZJ power

Can someone point me to a thread with the ZJ 5.2 swap? I have a donor ZJ 4x4 and want to put the powertain into my old yj. I’d like some direction on wiring, driveshafts, transfer case, etc. Right now it’s basically a stock Sahara 4.2 with the Howell tbi and an hei dizzy. My starter went out and fried a bunch of wires, and it’s getting rather hard to track parts for the 4.2. I figure a ZJ at least keeps it kinda Jeep and there’s plenty of those floating around. Thanks in advance!🦖

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Old 08-16-2019, 12:14 AM   #2
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LS swap it

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94, 4.0/NV4500/NP231HD w/JB Conversions super short SYE, 4.5" Rubicon Express lift, JKS 1.25" body lift, Dana 489's w/OX lockers 4.88 gears, Tom Woods drveshafts, 35" BFG KM3's, WFO boomerang shackles, Warn XD9000 winch, Doug Thorley header, JBA mid pipe, Borla cat back.
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Old 08-16-2019, 07:39 AM   #3
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Quote:
Originally Posted by agalloch07 View Post
LS swap it
^^ I agree. I like my son's ZJ, (3rd one we've had), but My Daughters Silverado's 5.3 is more likely to end up in my YJ. JMHO...
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'89 YJ 4.2 with MC-2150 Carb & HEI, 2-1/2" Magnaflow Exhaust. BA-10, NP231, Adams front Diveshaft, SYE kit, 31x 10.5 x15 BFG KO's, 2 1/2" Rancho Spring kit, 1" Body Lift. RS5000x shocks, No emissions.

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Old 08-16-2019, 07:44 AM   #4
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Quote:
Originally Posted by Rexford71 View Post
Can someone point me to a thread with the ZJ 5.2 swap? I have a donor ZJ 4x4 and want to put the powertain into my old yj. I’d like some direction on wiring, driveshafts, transfer case, etc. Right now it’s basically a stock Sahara 4.2 with the Howell tbi and an hei dizzy. My starter went out and fried a bunch of wires, and it’s getting rather hard to track parts for the 4.2. I figure a ZJ at least keeps it kinda Jeep and there’s plenty of those floating around. Thanks in advance!🦖
Nice paint on the avatar, Have you done your homework on the engine swap
and getting past CARB in Ca? Just curious to know what's involved.
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'89 YJ 4.2 with MC-2150 Carb & HEI, 2-1/2" Magnaflow Exhaust. BA-10, NP231, Adams front Diveshaft, SYE kit, 31x 10.5 x15 BFG KO's, 2 1/2" Rancho Spring kit, 1" Body Lift. RS5000x shocks, No emissions.

FSM Manuals https://www.dropbox.com/sh/0vfmk6jc5...v7lceZk7a?dl=0
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Old 08-16-2019, 09:03 AM   #5
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Quote:
Originally Posted by Got it at last View Post
Nice paint on the avatar, Have you done your homework on the engine swap
and getting past CARB in Ca? Just curious to know what's involved.
That's the first thing to figure out.
California has some peculiar and restrictive rules about engine swaps.
If you Google "California CARB regulations" you should be able to find out what's allowed.

Once you've figured out what to do, figuring out how to do it is easy(ier).

Depending on the condition of the ZJ powertrain, and considering that it appears that you already own it, the first thing I'd look at is the length of the ZJ engine, transmission and transfer case.
YJs have a short wheelbase that requires a short driveshaft. This causes all sorts of issues when swapping other components into our beloved heaps.
Longer transmissions and lift kits make for steeper driveshaft angles that results in vibrations at highway speeds and premature U-joint failure. There's fixes to almost any issue, it just depends on how complicated you want to make it plus your budget and tolerance for complications.

If the ZJ powertrain is any longer than what you have, I'd seriously consider a SBC swap. The small block chevy swap is very well supported in the aftermarket, both in available parts and information.
I haven't looked into either swap, but I'd guess there's a whole lot more parts and experience available to do a SBC swap than the ZJ 5.2 swap.

The simplest thing and probably cheapest thing you can do if you can't find emission controls for your 4.2 is to install a Howel fuel injection setup.
Other than the emissions parts, everything else for a 4.2 should be readily available.
I.m running a 4.2 in a non-emissions county and haven't had any problems with parts availability.

Keep us posted on what you find out as far as CARB regulations and how you plan to proceed.

Good Luck, L.M.
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HEI distributor with computer and all related relays and wiring removed.
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Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 08-16-2019, 09:26 AM   #6
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Seems difficult in CA. but it is not as long you have all smog equipment from the donor vehicle installed as it would have been in the original car/truck. Has to be newer then the replacement engine and from the same type. Car/Truck. YJ is registered in CA as LDT, light duty truck. If done right, no problem.
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1995 YJ. That's it...from Jeep. 5.3L Chevy LM7, 4L60e, NV233C Transfer Case with electronic Shift, 2.5" RC Lift. 8.8 Ford Rear with Yucon Posi Grip, 4.10 Gears, 33x12.5x15 KM2's. Marshall Instruments Gauges, Sick Speed Racing Seats.
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Old 08-16-2019, 11:30 AM   #7
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Superb Job MannyN!!! Man, that looks like a true work of art.
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Old 08-16-2019, 11:50 PM
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Thanks for the input everyone! The reason for the ZJ vs LS swap is money. I can source the ZJ for les than 500$, runs and drives fine. I currently have the Howell tbi and am having multiple wiring issues, and one small fire. Now it just cranks and won’t fire. Maybe I’ll just scrap the Howell, try and get the 4.2 rebuilt and go with the 4.0 head and mpi
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Old 08-17-2019, 11:07 AM   #9
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Here's some tough love.
The cure for your problems with the Howel, the wiring and the fire isn't an engine swap nor a rebuild of your current engine.
The cure for your current problems is to find out what's wrong with your wiring and repair it. Replacing your motor because of a wiring problem is like buying a new pair of shoes because you had a pebble in the old shoe.

Find a post by Got it at last and look in his signature. In his signature he has a link to several Factory Service Manuals. Click on that link and then click on the FSM that matches the year of your jeep.
In the electrical troubleshooting section you'll find schematics that you can use to diagnose what might be wrong with your wiring. Once you're confident the wiring is proper and you still have issues, contact Howel.

Electrical issues are the greatest headache for most of us. There is a learning curve that seems impossible to overcome, but our options are:
1- learn to read a schematic and use it to diagnose our problems
2- Pay someone to repair our problems or enlist the help of a knowledgeable repairman
3- sell the vehicle for cheap to someone that's willing to tackle the problem.
If you rebuild your current motor, even with a 4.0 head, you'll still have the existing electrical problems.

As far as learning to read a schematic, it isn't as overwhelming as you might think if you take it in small bites. Like eating an elephant. One small bite at a time.
What I do is print the page from the FSM that relates to the current problem. In your case it's probably the engine management system page. Then, carry that page ot to the shop and compare it to what's on the Jeep....one wire at a time. You can make notes on the paper as you trace each circuit. You may have to open the plastic conduits to follow each circuit and it could take many hours or days to find and repair what's wrong.

I'd start with what you know or see what's already been changed (messed with). Look for poorly made connections (they need to be soldered and shrink wrapped). Twisted and taped connections are a No-No. Butt connectors are (arguably) a poor substitute for a proper connection.

Once you've dug into your problem, post again with what you've found and if you need any more suggestions. We're here to help.

Good Luck, L.M.
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"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 08-17-2019, 02:00 PM   #10
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May sound harsh, but Very True, The hours I've spent reading have saved many more staring at the engine dumbfounded.

Manuals in dropbox link below. Good luck,
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'89 YJ 4.2 with MC-2150 Carb & HEI, 2-1/2" Magnaflow Exhaust. BA-10, NP231, Adams front Diveshaft, SYE kit, 31x 10.5 x15 BFG KO's, 2 1/2" Rancho Spring kit, 1" Body Lift. RS5000x shocks, No emissions.

FSM Manuals https://www.dropbox.com/sh/0vfmk6jc5...v7lceZk7a?dl=0
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Old 08-18-2019, 10:01 AM
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Once again thank you everyone. Although my wiring is an issue, it’s not the only issue. When she was running, before the fireworks, dead starter, relays, etc, she was starting to smoke pretty bad after idling for two or three minutes. So a rebuild is in the not too distant future anyway. But I ordered an item wiring harness that hasn’t been hacked, am going to replace mine, and try to get the pos Howell to work. If that is unsuccessful, I think I’m going through with the swap. If it is successful, I’ll hopefully keep her going til Christmas, because all the events I want to attend will be over, then I’ll gut her and do the conversion then. I didn’t want to go LS but like everyone has said, the aftermarket support is the best for that conversion, so I’ll have time to start gathering everything I’m going to need. I appreciate the help, you are all awesome!🦖🦖
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Old 08-18-2019, 10:03 AM
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Oem wiring harness, not item lmao. Dammit autocorrect 🤣🤣😎😎

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