motor swap wireing need help - 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 > motor swap wireing need help

Oconee Off-Road Now Offering Zone Off-Road Products!!!RIGID LED Light Blowout Sale - All Sizes, All Series, all USA Standard Chromoly Front Axle Shaft Kits with Dana 30 4

Reply
Unread 02-01-2013, 08:31 AM   #1
ericandress
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2011
Location: mallorytown, ontario
Posts: 25
motor swap wireing need help

k i got a 89 yj had a 2.5 got a 4.0l and put it in got new wireing harness got it all in but the jeep with not turn over with the key but i can get it to start by crossing the solinoyid really dont know what else to do been working on this slowly for a wile now hope you guys can help.


thanks Eric

ericandress is offline   Reply With Quote
Unread 02-01-2013, 08:59 AM   #2
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,545
Did you rewire the bulkhead? The harness from the inside to the outside is not a 1 for 1. The bulhead wires need to be changed. Also you don't need to go down to the starter solinoid to turn it over. You can jumper poer inside the pdc at the relay from pin 30 to 87.
Que89YJ is offline   Reply With Quote
Unread 02-01-2013, 12:37 PM   #3
ericandress
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2011
Location: mallorytown, ontario
Posts: 25
so should i just spend the money on an under dash wireing harness or is there anyway i can get it to work
ericandress is offline   Reply With Quote
Unread 02-01-2013, 12:43 PM   #4
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,545
Yes or yes. Yes you can make it work. You need to go through the bulkhead connector. I think 6 wires or buy one. But either way the bulkhead is your problem.
Que89YJ is offline   Reply With Quote
Unread 02-25-2013, 10:59 AM   #5
ericandress
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2011
Location: mallorytown, ontario
Posts: 25
dose anyone have a wireing diagram? cant seem to find the right one for my year jeep its a 91 4.0 motor and harness going into an 89 yj sahara that had a 2.5
ericandress is offline   Reply With Quote
Unread 02-25-2013, 11:13 AM   #6
jhartley
Registered User
1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: maysville, ky
Posts: 171
Will it run but not start off the key? Sounds like you only have one wire to worry about I had a similar problem when I did my swap using a 93 motor and interior harness. My problem was the wire coming from the key to the starter relay was in two different spots on my harnesses
jhartley is offline   Reply With Quote
Unread 02-25-2013, 11:27 AM   #7
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,545
http://www.jeepforum.com/forum/f12/4...r-wiring-list-
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.
Google the forum for images and info:
http://www.jeepforum.com/forum/f12/f...oogle-1003734/
Also search for 5 to fire.
91-bulkhead-connector-engine-compartment.jpg   91-bulkhead-connector-firewall.jpg   8889yjbulkhead.jpg  
Que89YJ is offline   Reply With Quote
Unread 02-25-2013, 11:32 AM   #8
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,545
Link for the 90 FSM with all the wiring schematics:
http://dl.dropbox.com/u/40590346/199...e%20Manual.pdf
Que89YJ is offline   Reply With Quote
Unread 02-25-2013, 11:41 AM   #9
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,697
Quote:
Originally Posted by jhartley View Post
Will it run but not start off the key? Sounds like you only have one wire to worry about I had a similar problem when I did my swap using a 93 motor and interior harness. My problem was the wire coming from the key to the starter relay was in two different spots on my harnesses
While I understand your reasoning. I disagree. I can run my engine without an O2 sensor but it will run crappy. There is probably more than one wire off and some missing as he is going from TBI to MPFI.

To the OP Que will get you straight just listen to him. He is a genus when it comes to this stuff.
__________________
1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
Siva283 is offline   Reply With Quote
Unread 02-25-2013, 11:51 AM   #10
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,545
I will follow you on this post and let the old post you raised from the dead go. The bulkhead wiring should be essentially the same on the engine side. Move the wires on the pinouts to match it and you should be good to go.
Que89YJ is offline   Reply With Quote
Unread 02-25-2013, 12:03 PM   #11
jhartley
Registered User
1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: maysville, ky
Posts: 171
Quote:
Originally Posted by Siva283 View Post
While I understand your reasoning. I disagree. I can run my engine without an O2 sensor but it will run crappy. There is probably more than one wire off and some missing as he is going from TBI to MPFI.

To the OP Que will get you straight just listen to him. He is a genus when it comes to this stuff.
I'm sorry. I was trying to give a little help on what I had ran into in my swap. My 4.0 would run but wouldn't start off of the key because the interior wiring harness was sending the yellow starter wire through the fuse block bulkhead and on the engine side harness the wire was located In the 10 pin wiring harness that goes through the firewall behind the radio.
jhartley is offline   Reply With Quote
Unread 02-25-2013, 12:06 PM   #12
Siva283
Registered User
1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,697
Quote:
Originally Posted by jhartley View Post
I'm sorry. I was trying to give a little help on what I had ran into in my swap. My 4.0 would run but wouldn't start off of the key because the interior wiring harness was sending the yellow starter wire through the fuse block bulkhead and on the engine side harness the wire was located In the 10 pin wiring harness that goes through the firewall behind the radio.
NO need to apoligize. I wasnt jumping your chit. I just gave my reasoning and explanation for my reasoning. You were going MPFI to MPFI so yours should have been pretty close though IIRC 91 is a weird one of a kind year for the YJ.
__________________
1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
Siva283 is offline   Reply With Quote
Unread 02-25-2013, 06:35 PM   #13
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,545
It's all good Jhartley. There isn't anything to apologize about. 93-95 had that connector. 91 and 92 are different. I am sure he missed G5. You are close!
Que89YJ is offline   Reply With Quote
Unread 02-25-2013, 07:36 PM   #14
jhartley
Registered User
1991 YJ Wrangler 
 
Join Date: Apr 2011
Location: maysville, ky
Posts: 171
It's ok I have a 91 interior wiring harness that I bought extra it has a 10 pin connector that goes through the center of the fire wall I didn't use because I had a 93 engine harness and didn't want to go through the trouble of splicing wires. Both the 93 and the 91 interior harnesses sent the starter wire through g5. For some reason the engine harness I had sent the starter wire through the middle fire wall bulk head connector
jhartley is offline   Reply With Quote
Unread 02-25-2013, 07:39 PM   #15
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,545
91 with the 10 pin? You can see the starter feed on the bulkhead? Of am confused.
Que89YJ is offline   Reply With Quote




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.