junkyard mpi swap Q's - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > junkyard mpi swap Q's

Jeep Grand Cherokee Mirror - Side ViewJeep Grand Cherokee Headlight AssembliesThe Retrofit Source / JW Speaker LED Headlight GROUP BUY!

Reply
Unread 10-06-2010, 01:05 AM   #1
feuer895
Registered User
1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Beaverton OR
Posts: 71
junkyard mpi swap Q's

HI i am in the middle of doing a mpi swap like the title said. I have a couple questions.

1. The + cable on the battery what does it connect too?
The PDC, starter, and alternator???

2. The return line on the fuel rail is the connection thats connected to the regulator right ??

3. On the bulkhead connector i was going to move the pins around on the inside to connect to the right ones from the engine harness is that the only wiring i need to modify on my old harness on the yj???

Also when looking at it from the front the right side on the yj harness is for lights, horn, etc.. The right side on the cherokee harness do i need to do anything with it or can i take it out of the harness?????


I have a engine harness from a 93 cherokee, have the 93 alternator. Going onto my 89 YJ

thanks for the help

__________________
J.E.E.P.
Just Expect Every Problem
feuer895 is offline   Reply With Quote
Unread 10-06-2010, 07:58 AM   #2
dodger889
Registered User
1989 YJ Wrangler 
 
Join Date: Jan 2009
Location: mi
Posts: 4,162
The battery + connects to the starter that's the large wire The other one you should replace that with a heavier wire than is there 4ga or larger between the PDC and battery. Now depending on what alternator you use you might need to run an other heavier wire for that.

On the fuel line I use the fuel lines( metal ones) with high pressure fuel lines (rubber). And place a stock fuel pump in the tank.

On the lights leave the YJ side alone. Remove the xj lighting wires out of the wiring harness you will not need them. For the bulkhead connection I spliced the wires needed. Power, run,start, ground, gauges, heater fan,and anything else you would use.
__________________
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
dodger889 is offline   Reply With Quote
Unread 10-06-2010, 09:31 AM   #3
feuer895
Registered User
1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Beaverton OR
Posts: 71
So your saying the pdc, alternator, starter connect to the battery?

On the fuel line I was asking on the rail itself which port is the return and inlet

Thanks
__________________
J.E.E.P.
Just Expect Every Problem
feuer895 is offline   Reply With Quote
Unread 10-06-2010, 11:24 AM   #4
dodger889
Registered User
1989 YJ Wrangler 
 
Join Date: Jan 2009
Location: mi
Posts: 4,162
You do not have to change the alternator wiring unless you are using a larger alternator. The wiring should already there. Starter should be a no brainier. Now between the pdc and the battery I used a heavier wire then stock .

When looking at the fuel rail the one closer to the regulator is the return it is also the smaller of the two.
__________________
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
dodger889 is offline   Reply With Quote
Unread 10-06-2010, 01:36 PM   #5
feuer895
Registered User
1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Beaverton OR
Posts: 71
Thanks dodger, where does the stock fuel pump connector show it self? Is it the connector on the passenger side with the long lead?

I was going to tie my external pump into it.
__________________
J.E.E.P.
Just Expect Every Problem
feuer895 is offline   Reply With Quote
Unread 10-06-2010, 03:26 PM   #6
dodger889
Registered User
1989 YJ Wrangler 
 
Join Date: Jan 2009
Location: mi
Posts: 4,162
If you are adding a external fuel pump it needs to be back by the tank. There are two size line on is 5/16 and 1/4 inch the pump need to be on the 5/16 line with a fuel filter before the pump. I used a pump in the tank for a 2.5 and it has more than enough flow and pressure for the 4.0 .
__________________
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
dodger889 is offline   Reply With Quote
Unread 10-07-2010, 01:11 AM   #7
feuer895
Registered User
1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Beaverton OR
Posts: 71
so while doing this swap i decided to swap to serpitine belt set up (its taking longer then the 4.0 swap) im having problems with the belt slipping off the balancer.

I'm pretty sure i have all chrysler brackets and pulleys im wondering if the hesco balancer just isn't going in all the way??? i have it torqued to spec.

Anyone else have this problem if so what did you do to fix it??

i might just go back to the pull yard tomorrow and pull off the rest of the parts from the donor jeep.
__________________
J.E.E.P.
Just Expect Every Problem
feuer895 is offline   Reply With Quote
Unread 10-07-2010, 03:04 AM   #8
dodger889
Registered User
1989 YJ Wrangler 
 
Join Date: Jan 2009
Location: mi
Posts: 4,162
Do you have the xj set up or did you convert it over to yj setup? There is a slight differences between the two. Just incase you do the yj setup alternator/ ac bracket from either 91-95 4.0 or 2.5 will work. did you change the water pump to an yj style?

If you can post up a couple of pictures of what you have that would help to see what might be wrong.
__________________
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
dodger889 is offline   Reply With Quote
Unread 10-07-2010, 02:30 PM   #9
feuer895
Registered User
1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Beaverton OR
Posts: 71
i am going to run to the junkyard now and grab the WP and steering bracket/pump from the yard now so its all from one year.

Here are some pictures you can see in the bottom one that the belt come off the ribs and tracks closer to the block. i tried shimming out the water pump pulley and steering pulley but no luck on them.




Imageshack - 201010070010011024x768.jpg

Imageshack - 201010070010031024x768.jpg
__________________
J.E.E.P.
Just Expect Every Problem
feuer895 is offline   Reply With Quote
Unread 10-07-2010, 03:32 PM   #10
wrongway92407
Member
 
wrongway92407's Avatar
1986 CJ7 
 
Join Date: Nov 2009
Location: Devore Ca.
Posts: 483
So Dodger, let me understand this the brackets on a xj are different than on a yj or is it the pulleys that are different or both. I have a 92 4.0 that I'm sticking in a cj 7 and Im missing the p/s bracket.
__________________
Wrongway
My fleet:
86 CJ7 5.7 vortec. 4L60,D44's,OBA,Air tank bumpers w/D rings detroits,4.88,35" bfg, mt's 9500ti warn
86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
86 CJ7 bone stock, w/factory 44 never seen the dirt soon to be for sale
87 Wrangler also never seen the dirt.
wrongway92407 is offline   Reply With Quote
Unread 10-07-2010, 03:49 PM   #11
feuer895
Registered User
1998 TJ Wrangler 
 
Join Date: Apr 2008
Location: Beaverton OR
Posts: 71
i found out what was wrong!!!!

Turns out the dampener/sensor i had was for a 4.2 serpentine belt set up not a 4.0 serp set up theres about a 1/2" difference between the two.

i guess i didn't look hard enough on there site and ordered the first on i saw my bad.

The 4.2 spaces the belt out farther then the 4.0 so i called hesco up and they are sending me a dampener/sensor for 91 and up. Awesome customer service



I was wondering if anyone could supply a bulkhead diagram for a 93 cherokee harness i have one for my 89yj i just want to make sure i match the wires up for it.

Also where does the fuel pump plug into the harness??
__________________
J.E.E.P.
Just Expect Every Problem
feuer895 is offline   Reply With Quote
Unread 10-07-2010, 07:31 PM   #12
dodger889
Registered User
1989 YJ Wrangler 
 
Join Date: Jan 2009
Location: mi
Posts: 4,162
Pm me your email addy I will send you a wiring diagram for 92 xj if you want that.
__________________
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
dodger889 is offline   Reply With Quote
Unread 02-24-2013, 02:33 PM   #13
ericandress
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2011
Location: mallorytown, ontario
Posts: 25
hey dodger i got an 89 yj that had a 2.5 in it swaped in a 91 4.0 i got the 91 yj harness off ebay just not sure witch pins go where can u help? thanks Eric
ericandress is offline   Reply With Quote
Unread 02-25-2013, 08:31 AM   #14
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,764
http://www.jeepforum.com/forum/f12/4...-list-1004732/
http://www.jeepforum.com/forum/f12/9...dvice-1118478/

You need to swap some wires to make it work at the bulkhead and add a few. Here is the bulkhead pin out. You should start a new thread. This one is old. You can google the forum for images and info:
http://www.jeepforum.com/forum/f12/f...oogle-1003734/

Also search for 5 to fire.
91-bulkhead.jpg   91-bulkhead2.jpg   8889yjbulkhead.jpg  
Que89YJ is offline   Reply With Quote
Unread 02-25-2013, 11:45 AM   #15
ericandress
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2011
Location: mallorytown, ontario
Posts: 25
thanks man hope these will help dose it matter that i have a yj harness not an Xj harness ?
ericandress is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.