carnuck Posted October 14, 2017 Share Posted October 14, 2017 I have the ‘87 4.0L 5 speed harness originally from the MJ in my avatar picture with C101 connector like my ‘87 4 cyl and I’m considering a temporary swap with that and the 4.0L AW4 I have. (I can drive the AX-4 but my left leg ligaments being torn mean I need to go to automatic manually shifted if I have to) Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 14, 2017 Share Posted October 14, 2017 That's nice. (Is this post a question or a statement?) Link to comment Share on other sites More sharing options...
carnuck Posted October 14, 2017 Author Share Posted October 14, 2017 That's nice. (Is this post a question or a statement?) There is a question but not very clear I guess. Lol. (Jake and Ellwood interrupted my thought)Will the C101 connectors match from 4 cyl to 6 cyl? I know later on I can swap the whole harness but the parts rig runs and I am keeping it for Emergency backup until I have the shortbox daily drivable. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
carnuck Posted October 16, 2017 Author Share Posted October 16, 2017 So I get a call and find out an ‘87 XJ is waiting for me to buy next payday. A little bit of fixing and I’ll have 4x4 for winter and the 4.0L swap can be done complete harness and all. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Eagle Posted October 16, 2017 Share Posted October 16, 2017 On 10/14/2017 at 4:21 PM, carnuck said: There is a question but not very clear I guess. Lol. (Jake and Ellwood interrupted my thought) Will the C101 connectors match from 4 cyl to 6 cyl? I know later on I can swap the whole harness but the parts rig runs and I am keeping it for Emergency backup until I have the shortbox daily drivable. Sent from my iPhone using Tapatalk I'm pretty certain you can't just unplug a 4-cylinder from the C101 and plug in a 6-cylinder. Obviously, the ECU is different, and I believe the pinouts are different. Link to comment Share on other sites More sharing options...
carnuck Posted October 16, 2017 Author Share Posted October 16, 2017 I'm pretty certain you can't just unplug a 4-cylinder from the C101 and plug in a 6-cylinder. Obviously, the ECU is different, and I believe the pinouts are different. I couldn’t recall if the harness for the ecu was before or after the C101. I know the TCU was because of swapping auto in before. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Eagle Posted October 16, 2017 Share Posted October 16, 2017 In the RENIX years, the ECU is behind the firewall, above the driver's right foot. And the 4-cyl only has one injector (TBI), rather than 6 injectors for the 4.0L. Like it or not, regardless of the C101 you're really looking at a complete harness replacement, not an engine-side only temporary swap. Link to comment Share on other sites More sharing options...
carnuck Posted October 17, 2017 Author Share Posted October 17, 2017 I had planned to swap ECU anyways because I know they are different but I had the thought about how the TCU harness is between the C101 connector and the motor. I realize now the motor side would have to be on the chassis side or the C101 connector wouldn’t be as big. I know the plug on the ECU is different (wider connections on the 4 cyl one to the harness). On a different thought, what about using the TBI on the 6 cyl? It was brought up on the RENIXPower group a few years back. They use the same coil and ignition module but the TBI has no distributor sensors to tell TDC. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
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