cruiser54 Posted May 4, 2014 Author Share Posted May 4, 2014 Meant to ask you Cruiser... is there any potential MPG gains by doing the elimination and ground update? Yes. Just the fact that the system can operate optimally, as designed is good. My observation on the O2 sensor is a good example of before and after. Link to comment Share on other sites More sharing options...
cruiser54 Posted May 4, 2014 Author Share Posted May 4, 2014 I've been meaning to do this on my '88 as well. What I really don't like about it is that you're left with that giant loop of wire loom: Image Not Found Personally, I think there's already too much loom that traces all over the place. It's just ugly. Anything special to look for if removing the C101 and cutting the wires way short so it doesn't have the loop? Shorter is just fine. I allowed my 22 year old neighbor do the one in the photo. Kept it simple and him involved. Link to comment Share on other sites More sharing options...
cruiser54 Posted May 4, 2014 Author Share Posted May 4, 2014 C201 and C202 are the connectors at the ECU. They're the ones outlined in Post 9. Link to comment Share on other sites More sharing options...
88whitemanche Posted May 31, 2014 Share Posted May 31, 2014 I have a question...I know you say to match as much as possible wires to the sawn color wires on the other side....but I have an issue where one has 2 same color shades to the other side has one of the same...do I match all 3 together? Link to comment Share on other sites More sharing options...
88whitemanche Posted June 1, 2014 Share Posted June 1, 2014 Anyone that has done the c101 rewiring.... Is this how it works? Link to comment Share on other sites More sharing options...
cruiser54 Posted June 1, 2014 Author Share Posted June 1, 2014 Go pin for pin. Sometimes colors change at the connectors. Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 1, 2014 Share Posted June 1, 2014 Jesus, what a kludge system. :shake: For those who don't know the definition of kludge: A kludge (or kluge) (klo̅o̅j) is a workaround, quick-and-dirty solution, clumsy, inelegant, difficult to extend, hard to maintain yet effective and quick solution to a problem, and a synonym to the term "jury rig". Link to comment Share on other sites More sharing options...
nitroxsteve Posted June 1, 2014 Share Posted June 1, 2014 Go pin for pin. Sometimes colors change at the connectors. I just did my truck this weekend and there are definitely a few that change colors so do as Cruiser says and go pin to pin. I also had 4 wires that didn't go anywhere on the other side of the connector so don't let that confuse you. And just to let everyone know I didnt have any problems with my truck before eliminating the c101 but it does feel like it runs more smoothly now. Link to comment Share on other sites More sharing options...
cruiser54 Posted June 1, 2014 Author Share Posted June 1, 2014 Go pin for pin. Sometimes colors change at the connectors. I just did my truck this weekend and there are definitely a few that change colors so do as Cruiser says and go pin to pin. I also had 4 wires that didn't go anywhere on the other side of the connector so don't let that confuse you. And just to let everyone know I didnt have any problems with my truck before eliminating the c101 but it does feel like it runs more smoothly now. Typical. Link to comment Share on other sites More sharing options...
88whitemanche Posted June 1, 2014 Share Posted June 1, 2014 Crap...I just started with the first two wires that matched which were the bold yellow and the yellow with the green stripe.... Then got confused with the double same color on one side of the c101 and the one same color in the other.... Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 1, 2014 Share Posted June 1, 2014 Go pin for pin. Sometimes colors change at the connectors. Always pin to pin when eliminating a harness connector to maintain continuity. Wire color has nothing to do with it. When splicing a connector into a harness, then maintain wire color to wire color through the connector. Link to comment Share on other sites More sharing options...
88whitemanche Posted June 1, 2014 Share Posted June 1, 2014 Ok no problem I will cut the connected ones and redo then from pin to pin Link to comment Share on other sites More sharing options...
88whitemanche Posted June 1, 2014 Share Posted June 1, 2014 Go pin for pin. Sometimes colors change at the connectors.I just did my truck this weekend and there are definitely a few that change colors so do as Cruiser says and go pin to pin. I also had 4 wires that didn't go anywhere on the other side of the connector so don't let that confuse you. And just to let everyone know I didnt have any problems with my truck before eliminating the c101 but it does feel like it runs more smoothly now. Typical. What did you guys do with the spare wires? Just leave them be? Edit: seems like the wires match to the wires of the auto transmission plug wires... Link to comment Share on other sites More sharing options...
cruiser54 Posted June 1, 2014 Author Share Posted June 1, 2014 Could be. I've only done automatics so I never had extra wires. Link to comment Share on other sites More sharing options...
nitroxsteve Posted June 1, 2014 Share Posted June 1, 2014 On the spare wires I just put a piece of shrink wrap on the end to seal it off and wrapped it up in the harness. Link to comment Share on other sites More sharing options...
Co-MAAAN-cheee Posted June 2, 2014 Share Posted June 2, 2014 thanks to cruzers prodding me I did the c101 elimination, but, I kept the c101 housing for Original look. Posted a DIY. It made a world of difference. Sensors need close to 0 ohms of resistance to work correctly and the c101 absolutely adds unwanted resistance. If eagle is lucky enough to have zero resistance on his c101 now I have to bet he'll get some eventually. The fact that they eliminated it in the factory should be more than enough evidence that its the right thing to do. I'd be interested in eagle checking resistance on each connector pair and letting everyone know the numbers. I Say. Before you so anything else make sure you are getting less than 1 ohms resistance on sensor ground and eliminate the c101. your mother will be proud. Link to comment Share on other sites More sharing options...
mjeff87 Posted June 3, 2014 Share Posted June 3, 2014 If you have access to a later model underhood wiring harness (updated to eliminate the C101) you can swap harnesses. Here is the 89 MJ (automatic) harness I swapped into mine when I converted it to 4.0: Image Not Found Jeff Link to comment Share on other sites More sharing options...
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