The Shop > Project Cars

Turd Bird gets a powertrain swap

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TheBirdman:
To begin, I dont want to clog up this thread with duplicate posts, so for an overview on the car up till now, refer to this link:
http://forums.amceaglesden.com/index.php?topic=46603.0
I started a thread for my np242 swap, but after getting to the junkyard and seeing such a nice 96 cherokee (I thought it was a 95 at first), I decided to pull the trans and wiring harness out of it and finally get the fuel injection working. here is a link to the np242 swap thread, which contains a real informative writeup by amarshall:
http://forums.amceaglesden.com/index.php?topic=46609.0
Since this is turning into a much bigger project than just transfer case swap, I figured Id use a thread here.
Anyhoos, when I first swapped in the 4.0 (from 93 chero), I transplanted the entire eagle accessory drive and intake, to make the swap super easy at the time. I kept all the 4.0 parts in a box, and since then its had a mc2100 and HEI swap, and while it runs like a charm in nice weather, or after warmed up, its still a cold blooded bear when the temps get down below 20F. Ive always wanted to get it back to fuel injection, and now is the time. Well, now is subjective, what with life things going on itll probably be a few months till I have the money and time to complete it, but what else is the point of a project car, right?

So far, Ive pulled the transfer case, transmission, throttlebody, pcm, tcm, engine wiring harness, and the section of chassis wiring harness that contains the tcm wiring, along with assorted brackets and sensors. Ive found a FSM for a 97 cherokee, which as far as I can tell is pretty much the same as 96, so good enough for me. Ive made a spreadsheet from the pinout of the pcm, and went though noting which inputs are needed, which arent, and which I will have available after all the guts are swapped in. There are some things I cant tell if is needed or not, so in the current researching phase of the project, I am trying to nail down which inputs I can cut out and not affect engine performance. I Know the wiring would be easier if I had gotten an OBD1 pcm, but the junkyard didnt have one, so Im tinkling with the pickle ive got.

Ill cross these out as I figure them out, but if anyone has any knowledge or tips, let me know.

A25 - K141 18TN/BK -  DOWNSTREAM HEATED OXYGEN SENSOR
Its hard to find any solid information on this one because of all the stigma online about discussing emissions systems. Some say the downstream sensor has no effect of fuel trims and timing, and only sends a CEL to complain about the cat being worn out (I will not be adding a cat to the eagle), and some claim the pcm will mess with fuel trims to try to prevent further damage to the cat.

B10   K20 18DG    GENERATOR FIELD DRIVER
C25   K72 18DG/OR    GENERATOR SOURCE
I have the v-belt internally regulated alternator from the 4.2 on the engine, so I dont need to have the PCM regulate it, but I dont know if the PCM will run correctly without this hooked up.

B23   G60 18GY/YL    OIL PRESSURE SENSOR
I have the old style oil pressure sender that controls the dummy light on the dash, as well as an aftermarket oil pressure gauge, so I personally would prefer to continue using those, but I dont know if the PCM will run correctly without this input.

B27   G7 18WT/OR    VEHICLE SPEED SENSOR
The transmissing control module uses the VSS on the trans, and the PCM uses the VSS on the tail of the transfer case. Id like to convert the NP242 to cable speedometer drive so I can use the stock eagle speedometer, but again, I dont know if the PCM actually uses this input in engine management, or just to report to the factory cherokee instrument cluster.

C15   K118 18PK/YL    BATTERY TEMPERATURE SENSOR SIGNAL
I definitely dont have one of these, and logically Im pretty sure its not needed, but I cant be 100% sure.

C20   K52 18PK/BK    EVAP/PURGE SOLENOID CONTROL
same story as battery temp sensor

C26   K226 18DB/LG    FUEL LEVEL SENSE
pretty sure I dont need this one either, but worth mentioning

C24   K29 18WT/PK    STOP LAMP SWITCH SENSE
I dont have this circuit, but Im sure I could rig one up if needed. The wiring harness for the tcm uses this as well, but I dont know if that is just to prevent the stock cherokee shifting out of park without brake, or if it is actually used in engine management.

C27   D21 18PK    SCI TRANSMIT
C28   D2 18WT/BK    CCD BUS(–)
C29   D20 18LG/BK    SCI RECEIVE
C30   D1 18VT/BR    CCD BUS (+)
These are for the obd2 plug under the dash, as well as connecting to other computers like the tcm. I dont believe they are needed, but if might be fun to hook them up for kicks and giggles.

I also wasnt sure if all the wiring for the 96 would work on the 93 intake, since they are the different types, but I grabbed the 96's throttle body and sensors to be on the safe side.

Ill update this thread as I make progress, slow as it may or may not be.

mick:
I'll definitely be keeping up with this thread.

Taylor:
Looks like another good thread to watch. I love a good project.

Billman:
you have piqued my interest as well.

eaglefreek:
In your other thread, you stated you may go with an AW4. If so, you are going to want to plan on swapping differential gearing. With my AW4 swap, I had 3.55's, but believe 3.73's would have been better. However, I didn't have a 4.0L. I had a 258 with a 4.0L head with a carb.

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