xj ECM modifications and retrofit into a 1938 Plymouth - JeepForum.com

 
LinkBack Thread Tools
post #1 of 9 Old 04-09-2013, 12:43 AM Thread Starter
sasquatch1970
Registered User
 
Join Date: Apr 2013
Location: Southern
Posts: 2
xj ECM modifications and retrofit into a 1938 Plymouth

We took the engine and harness out of a wrecked 1991 xj 2wd. We installed the 4.0L engine and automatic transmission and rear end in a 1938 Plymouth sedan. I have wired up a aftermarket harness for the car but need to know if anyone knows what wires I need to keep for the ECM to run the fuel injection,etc. and make the engine run.... We also are trying to get the programming out of the ECM for the anti theft security... any help would be great. Also if anyone knows if I can ditch most of the power distribution center to lighten the harness and what relays I need to keep?

We have two Chrysler service manuals for the jeep and chassis so I can reference the pin numbers if someone knows what I need to remove and what I have to leave..... This is a nice upgrade for the old 38 and we are mopar folks so we are keeping it mopar... I will post up some photos when I get it done..... It is a jeep in sheep's clothing,,,, Thanks

sasquatch1970 is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 04-09-2013, 06:44 AM
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott
Posts: 11,065
Cool project!!

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
cruiser54 is offline  
post #3 of 9 Old 04-09-2013, 11:32 AM
Diamond-x
Registered User
1991 XJ Cherokee 
 
Join Date: Aug 2008
Location: Socal
Posts: 1,212
First, I have not done this swap. Nor have I seen anyone else having done this.

I would imagine it would be easiest to swap the entire harness over, including the power distribution. It has relays for the fuel pump, etc, that are crucial to the engine running. The main harness connection to the dash, through the firewall, will be the biggest concern. You'll need the service manual to figure where the wires will interface to the ignition, power and others.

Sounds like an awesome project!

Please post pictures!
Diamond-x is offline  
post #4 of 9 Old 04-10-2013, 08:45 PM Thread Starter
sasquatch1970
Registered User
 
Join Date: Apr 2013
Location: Southern
Posts: 2
Diamond X

I agree that using the whole harness would have been easier, my buddy cut off the engine portion of the harness and scrapped the rest. He bought a aftermarket hot rod wiring harness that I already wired up so now I have to figure out how to integrate both harnesses enough to make it run. His 4.0L engine only has 50,000 miles on it so it should run sweet in the 38 Sedan. Talking with the Chrysler dealer today they said that if the ECM has security which ours does, we have to get a new ECM that doesn't have security because you cannot un program it out of the ECM.

what I REALLY need help with now is seeing what wires I need to keep to the ECM to make it run when you hit the key. I know I can eliminate the wires for the idiot lights and airbag stuff and anti lock brakes since we dont have any of that anymore, but trying to figure out what we HAVE to have is interesting because as of now I don't know of anybody doing this kind of swap before... If it was easy then everyone would be doing it....
Attached Thumbnails
1.jpg   2.jpg   3.jpg   4.jpg  
sasquatch1970 is offline  
post #5 of 9 Old 04-10-2013, 10:23 PM
TDTech
Registered User
2000 XJ Cherokee 
 
Join Date: Oct 2010
Location: Lubbock
Posts: 103
cam sensor, crank sensor, map sensor, coolant temp sensor, o2 sensor. that's all i can think of at the moment. those need to be hooked up for it to run the way it should. it'll run without the coolant and o2 sensor but it will run real rich.
TDTech is offline  
post #6 of 9 Old 04-11-2013, 06:06 AM
Kalali
Registered User
2000 XJ Cherokee 
 
Join Date: Apr 2012
Location: Ocean
Posts: 643
Take that orange filter off that motor before you get too much flak...What you need is the wiring diagram. I'm sure someone here has it. Or get the FSM.
Kalali is offline  
post #7 of 9 Old 04-11-2013, 06:14 AM
cruiser54
Web Wheeler
 
cruiser54's Avatar
1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott
Posts: 11,065
Quote:
Originally Posted by Kalali View Post
Take that orange filter off that motor before you get too much flak...What you need is the wiring diagram. I'm sure someone here has it. Or get the FSM.
Were you referring to me? About the flak, I mean. LOL.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
cruiser54 is offline  
post #8 of 9 Old 04-11-2013, 10:57 AM
Diamond-x
Registered User
1991 XJ Cherokee 
 
Join Date: Aug 2008
Location: Socal
Posts: 1,212
You'll save a lot of time by starting with a non-security ECM and a complete harness, unplugged, not cut.

Paint looks nice!
Diamond-x is offline  
post #9 of 9 Old 04-11-2013, 11:29 AM
buildin1XJ
Registered User
1999 XJ Cherokee 
 
Join Date: Oct 2011
Location: Knoxville
Posts: 1,587
Cool Project. With the cut wiring harness how do you plan to wire the Transmission control module?
buildin1XJ is offline  
Reply

Tags
4.0 , cherokee , ecm , jeep , xj

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome