MJ_Corrry Posted February 6, 2022 Share Posted February 6, 2022 As I promised in the Facebook group, I am starting a build thread of this little truck I rescued on 2/4/2022 This is currently a 1988 4.0 AW4 2WD Sport Truck. It doesn't run and has a failed OBD2 swap that has been performed. It cranks but won't fire. I haven't dug to much into it, Was busy cleaning the mold, dirt and wasp nests off it today. If anyone has any info on a 1996 XJ OBD2 swap into a MJ I would love to read it. Maybe figure out where they went wrong. I will search around the forum none the less though. Here are the photos from filthy to clean. Random other vin tag on the core support Besides a small hole in the drivers floor pan right near the fuse block, This is the only real body damage. Link to comment Share on other sites More sharing options...
tugboat95 Posted February 6, 2022 Share Posted February 6, 2022 You got a good starting point.1989 Eliminator4.0L 5 speed2wd Link to comment Share on other sites More sharing options...
89 MJ Posted February 6, 2022 Share Posted February 6, 2022 Nice MJ and I’m envious of the 3/4 ton Yukon! Link to comment Share on other sites More sharing options...
MJ_Corrry Posted February 6, 2022 Author Share Posted February 6, 2022 24 minutes ago, 89 MJ said: Nice MJ and I’m envious of the 3/4 ton Yukon! Thanks! I'm pretty sure the wife is going to steal this MJ for herself. I LOVE that Yukon. The 8.1 does consume a lot of fuel but it doesn't miss a beat towing anything. Link to comment Share on other sites More sharing options...
Pete M Posted February 7, 2022 Share Posted February 7, 2022 solid! Link to comment Share on other sites More sharing options...
MiNi Beast Posted February 7, 2022 Share Posted February 7, 2022 Looks to be missing a map sensor to start.. double check fuel air and spark systems, cps and tps common replacement sensors as well as oxygen sensor. Obd 2 setup should have a return line from rail back to tank. Decent truck found there. Look forward to updates. Thanks for sharing your project adventure with us here. Link to comment Share on other sites More sharing options...
MJ_Corrry Posted February 8, 2022 Author Share Posted February 8, 2022 23 hours ago, MiNi Beast said: Looks to be missing a map sensor to start.. double check fuel air and spark systems, cps and tps common replacement sensors as well as oxygen sensor. Obd 2 setup should have a return line from rail back to tank. Decent truck found there. Look forward to updates. Thanks for sharing your project adventure with us here. Good catch on the map sensor! I don't have any power going to the fuel pump and I see a few connectors with a fair share of cut wires under the dash. Also injectors 4 and 5 have chewed through wires. I thankfully (I guess?) have owned a fair share of XJs so I can't wait to mess with this failed swap. Love getting things working correctly that others can't. Just torn now on what one of my comanches I'm going to 5.3 LS swap now. Will keep this updated for sure, I'm spending more time on forums now and away from the meta verse (besides the CC Instagram and my own) Link to comment Share on other sites More sharing options...
MJ_Corrry Posted February 10, 2022 Author Share Posted February 10, 2022 On 2/6/2022 at 10:04 PM, MiNi Beast said: Looks to be missing a map sensor to start.. double check fuel air and spark systems, cps and tps common replacement sensors as well as oxygen sensor. Obd 2 setup should have a return line from rail back to tank. Decent truck found there. Look forward to updates. Thanks for sharing your project adventure with us here. @MiNi Beast after investigating the wiring harness further, I found no evidence of a map sensor plug at all. The harness appears to be a factory one with no signs of anyone cutting it apart in the engine bay. Was there any year a 4.0 didn't have a MAP sensor? I know my 88, 89 MJs have them, Old 95 and 97 XJs have had them and have given me no start issues over the years. Link to comment Share on other sites More sharing options...
MiNi Beast Posted February 10, 2022 Share Posted February 10, 2022 Should be on firewall for 96 xj and renix has one on the throttle body itself. You may have a renix setup yet with h.o head and block... Link to comment Share on other sites More sharing options...
89 MJ Posted February 10, 2022 Share Posted February 10, 2022 Based on the throttle cable, that is most definitely an HO TB. Link to comment Share on other sites More sharing options...
MiNi Beast Posted February 10, 2022 Share Posted February 10, 2022 Looks like you have 96 dash and what not as well so things may be confused on the Ignition also to back harness which contains fuel pump power. Link to comment Share on other sites More sharing options...
The86manche Posted February 10, 2022 Share Posted February 10, 2022 It looks like the interior is 96 swapped but the drivetrain honestly looks like it's a 97+ The ecu looks like one from a later style xj with the metal case. The 96 used the plastic case for the ecu and one plug instead of 3? It has. It might be the 97+ harness in the engine bay and 96 harness in the cab and they aren't compatible? Or someone has modified and done a really good job making it look factory Link to comment Share on other sites More sharing options...
MJ_Corrry Posted March 4, 2022 Author Share Posted March 4, 2022 On 2/9/2022 at 7:38 PM, MiNi Beast said: Should be on firewall for 96 xj and renix has one on the throttle body itself. You may have a renix setup yet with h.o head and block... It's not a Renix at all, I'm very familiar with the Renix system. Sadly, This is my 3rd MJ and my first one is still around. haha On 2/9/2022 at 7:41 PM, 89 MJ said: Based on the throttle cable, that is most definitely an HO TB. Yeah its a HO for sure On 2/9/2022 at 7:41 PM, MiNi Beast said: Looks like you have 96 dash and what not as well so things may be confused on the Ignition also to back harness which contains fuel pump power. Yeah its a 95 or 96 dash or at least the column with the airbag in it. On 2/10/2022 at 12:57 PM, The86manche said: It looks like the interior is 96 swapped but the drivetrain honestly looks like it's a 97+ The ecu looks like one from a later style xj with the metal case. The 96 used the plastic case for the ecu and one plug instead of 3? It has. It might be the 97+ harness in the engine bay and 96 harness in the cab and they aren't compatible? Or someone has modified and done a really good job making it look factory It appears to be a 97+ or I'm learning to a 98+ swap as far as the engine goes. I recall my 97 XJ having a map sensor on the fire wall. Or maybe I'm confusing that with my old 95 XJ. Its a blur over the years with these XJs and MJs. I haven't done anything else with it the last few weeks. It does turn over so at least the engine isn't seized. Who ever did what they did didn't do a horrible job. Link to comment Share on other sites More sharing options...
The86manche Posted March 4, 2022 Share Posted March 4, 2022 2 hours ago, MJ_Corrry said: It's not a Renix at all, I'm very familiar with the Renix system. Sadly, This is my 3rd MJ and my first one is still around. haha Yeah its a HO for sure Yeah its a 95 or 96 dash or at least the column with the airbag in it. It appears to be a 97+ or I'm learning to a 98+ swap as far as the engine goes. I recall my 97 XJ having a map sensor on the fire wall. Or maybe I'm confusing that with my old 95 XJ. Its a blur over the years with these XJs and MJs. I haven't done anything else with it the last few weeks. It does turn over so at least the engine isn't seized. Who ever did what they did didn't do a horrible job. It's definitely the old 95 style that has the map sensor on the firewall. The 97 style had them next to the throttle body. My brother had a 98 cherokee. I used to have a 96. It all definitely starts to blur together after a while. Haha Link to comment Share on other sites More sharing options...
MJ_Corrry Posted March 6, 2022 Author Share Posted March 6, 2022 On 3/4/2022 at 12:05 AM, The86manche said: It's definitely the old 95 style that has the map sensor on the firewall. The 97 style had them next to the throttle body. My brother had a 98 cherokee. I used to have a 96. It all definitely starts to blur together after a while. Haha There is no map sensor or plug for it on the firewall. Doesn't appear that the harness has been touched either. Maybe will dig into tomorrow a bit if I get some time Link to comment Share on other sites More sharing options...
The86manche Posted March 7, 2022 Share Posted March 7, 2022 On 3/5/2022 at 10:58 PM, MJ_Corrry said: There is no map sensor or plug for it on the firewall. Doesn't appear that the harness has been touched either. Maybe will dig into tomorrow a bit if I get some time Zooming in kind of potatoed the photo but where I circled is where your map sensor is located. Indicating a 97+ harness/ throttle body and probably engine as well Link to comment Share on other sites More sharing options...
MJ_Corrry Posted March 11, 2022 Author Share Posted March 11, 2022 On 3/7/2022 at 12:12 PM, The86manche said: Zooming in kind of potatoed the photo but where I circled is where your map sensor is located. Indicating a 97+ harness/ throttle body and probably engine as well I will have to check this out. Won't lie, I have yet to pop the hood again since I cleaned it and parked it. So this will be a very slow moving saga of getting this thing runny. Thanks for the reference Link to comment Share on other sites More sharing options...
MJ_Corrry Posted March 14, 2022 Author Share Posted March 14, 2022 Spent a little bit of time today uncovering the rats nest of wiring behind the dash. This is going to be a chore to sort out in the coming weeks/months. Does anyone have a good source for wiring diagrams? This is for sure a OBD2 engine and harness in the MJ, Just not sold on it being a 97+ yet. Some reason it keeps flipping the picture every time I try and add it to the post. This is under the dash on the drivers side. The old body harness has been spliced into. It has the fuse block on the drivers side vs the passenger side. So maybe the harness is from a 96? I know my old 97 XJ fuses were all on the passenger side of the vehicle. Will continue to dig into this as time goes. Passenger side, Thankfully they swapped in the auto trans harnesses when they converted it from a manual. Link to comment Share on other sites More sharing options...
scguy Posted March 14, 2022 Share Posted March 14, 2022 What's the part number on the ECM? Link to comment Share on other sites More sharing options...
MJ_Corrry Posted March 14, 2022 Author Share Posted March 14, 2022 7 hours ago, scguy said: What's the part number on the ECM? Link to comment Share on other sites More sharing options...
scguy Posted March 14, 2022 Share Posted March 14, 2022 That's a 96 ECM. So you're right, it might not be a 97+ harness etc Link to comment Share on other sites More sharing options...
MJ_Corrry Posted March 14, 2022 Author Share Posted March 14, 2022 10 hours ago, scguy said: That's a 96 ECM. So you're right, it might not be a 97+ harness etc From what I have been reading a 97+ won't work with this interior and so forth. So this is good news. Just have to find out where the last person left off and continue on. Should be "easier" to track down 96 wiring diagrams. I hated owning a 97 XJ, was such a horrid year for everything. Link to comment Share on other sites More sharing options...
scguy Posted March 14, 2022 Share Posted March 14, 2022 I'll see about getting you some diagrams. Link to comment Share on other sites More sharing options...
MJ_Corrry Posted March 14, 2022 Author Share Posted March 14, 2022 38 minutes ago, scguy said: I'll see about getting you some diagrams. That would be great and super helpful! I have the complete 88 wiring diagrams so I'm good on those. Link to comment Share on other sites More sharing options...
scguy Posted March 17, 2022 Share Posted March 17, 2022 https://m.imgur.com/a/OgH9VKl I threw some diagrams up here for you. All OE 96 power train diagrams. Link to comment Share on other sites More sharing options...
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