Nefarious Posted June 28, 2014 Share Posted June 28, 2014 Very cool! Good job getting back at it man! Are you planning to run maf sensor or map/iat? The fsm has really good wiring diagrams for the wd21 ecu so it shouldn't be too bad to retrofit, if u need any help deciphering any diagrams then let me know. Link to comment Share on other sites More sharing options...
Adam Posted June 28, 2014 Author Share Posted June 28, 2014 (edited) Very cool! Good job getting back at it man! Are you planning to run maf sensor or map/iat? The fsm has really good wiring diagrams for the wd21 ecu so it shouldn't be too bad to retrofit, if u need any help deciphering any diagrams then let me know. I've ditched the stock wiring for the engine, I wired the Megasquirt directly to the stock connectors. I'm doing MAP+IAT (and taking the manifold to my shop today to drill and tap for the IAT). I am going to have to figure out how to keep the dash/interior power working and how to get switched/fused power to the Megasquirt though. Here's where the Pathfinder sits right now: I pulled the entire engine harness through the firewall. I had been trying to fix the old harness by splicing another Pathfinder's harness in at the firewall, but the wires didn't all match and it got much too complicated to actually repair. Ditching this and wiring the Megasquirt directly makes it a LOT simpler under the hood. I'm also still converting it to sequential ignition via LS2 coil packs. I've got the entire FSM in my OneDrive, had originally used it to wire the Megasquirt, when I was going to use the original harness. Oh, and I found out yesterday my idle air control valve is dead, probably been dead for a long time. Not absolutely necessary for the Megasquirt, but will definitely make it more civil, so I've got to replace that. I had to modify the Megasquirt a little bit to work with the distributor's optical sensors and also work with the IAC (since it requires more power than the standard IAC setup allows on the Megasquirt). Lots of progress over the last couple days. Oh... and yesterday I went to open the drivers side door, damned door handle snapped right off. Edited June 28, 2014 by Adam Link to comment Share on other sites More sharing options...
Nefarious Posted June 28, 2014 Share Posted June 28, 2014 (edited) You can just run an interposing relay to power the iacv if the megasquirt won't power it. Just run the iacv signs wire to the relay coil and run run battery power to the relay contacts. i can't even count how many times I've snapped off pathfinder door handles... I'm at 5 or 6 times now honestly. Broke down and bought metal handle ones, even snapped one of those last winter lol. Note to self....lubricate door seals in the winter.... lol Edited June 28, 2014 by Nefarious Link to comment Share on other sites More sharing options...
Adam Posted June 28, 2014 Author Share Posted June 28, 2014 Should be able to power it now, just had to install a $1 transistor. Link to comment Share on other sites More sharing options...
Nefarious Posted June 28, 2014 Share Posted June 28, 2014 Oh right on perfect, yeah a transistor driven to saturation will do just as well for a low current draw like that. Megasquirt sounds cool I want one for the pathfinder. Lol Link to comment Share on other sites More sharing options...
Adam Posted June 29, 2014 Author Share Posted June 29, 2014 I'll probably spend some time tomorrow digging through the harness... Not looking forward to it at all, but I really want my Pathfinder back on the road, it's been a year now. This is the longest I've owned one vehicle, but it's also spent about 75% of the time I've owned it parked Which is sad, because I really love driving it, it's been fantastic when I've needed it most. I especially want to get it running because I got a Grasslinks 4x4 center link I want to try out. Link to comment Share on other sites More sharing options...
Adam Posted June 29, 2014 Author Share Posted June 29, 2014 I finished pulling the dash out today, so I have full access to the wiring now, but man is it scary. I did find one error in my attempted rewire though, the alternator connector is currently wired to the ignition switch fuse instead of the battery. Whoops. Link to comment Share on other sites More sharing options...
Adam Posted June 29, 2014 Author Share Posted June 29, 2014 ECU harness is eliminated now, with the exception of wires I felt needed to be kept. I kept the wire that goes to the transmission control unit, all wires associated with A/C, wires going to various relays, the MAF wiring (in case I felt the urge to use it), the tach wire, and the VSS wire. Might be some I'm forgetting, but that's decent progress. Link to comment Share on other sites More sharing options...
Adam Posted June 29, 2014 Author Share Posted June 29, 2014 Not sure how much energy I have to put towards this today, it's really hot out, and it's mentally taxing, but I've got most all the snipped wires isolated, and the good news is they all go to the main bundle of wires that heads up the dash, so it shouldn't be too difficult to figure out I think. I know one set of the wires will be going to the main relay box on the passenger side of the engine bay. Link to comment Share on other sites More sharing options...
Manik Posted July 2, 2014 Share Posted July 2, 2014 WOW!! I just read through this. So Cool!! Has there been any more progress? Link to comment Share on other sites More sharing options...
Manik Posted July 2, 2014 Share Posted July 2, 2014 I was just thinking, I have a complete engine sensors and all, minus the MAF sensor. This would be an awesome way to setup this system and get everything functioning correctly. Plus all of the mods to intake, cams or whatever could be done, while you still have a running vehicle. Hmmmm....::pondering the possibility:: Link to comment Share on other sites More sharing options...
Manik Posted July 2, 2014 Share Posted July 2, 2014 Oh yea, failed to mention that the engine that I have is in pieces, but, I have it all. Both cylinder heads need rebuilt amongst other things, like a full bottom end rebuild. Link to comment Share on other sites More sharing options...
Adam Posted July 2, 2014 Author Share Posted July 2, 2014 WOW!! I just read through this. So Cool!! Has there been any more progress? Not since the weekend, between class and work I've been swamped. Link to comment Share on other sites More sharing options...
Adam Posted July 29, 2014 Author Share Posted July 29, 2014 Well, hate to be a downer but this morning I decided it was time to move on with the Pathfinder. I found some major rust holes in the floorboard and the wiring is just way too much of a basketcase. I was able to pull off as many good parts as I could though. So off it went this morning. Don't know if I'll get another or not, but it was a fun ride while it lasted. That was the longest I've ever owned a vehicle. Link to comment Share on other sites More sharing options...
Manik Posted July 29, 2014 Share Posted July 29, 2014 Dang!! I was looking forward to seeing the end result. What are you going to do with all of the stuff you purchased for this project? The megasquirt hardware, software and the spare computer? Link to comment Share on other sites More sharing options...
Adam Posted July 29, 2014 Author Share Posted July 29, 2014 Dang!! I was looking forward to seeing the end result. What are you going to do with all of the stuff you purchased for this project? The megasquirt hardware, software and the spare computer? I've got an 86 BMW 325e up in Dallas that is awaiting a much larger, more modern, more powerful engine (M54B30 for anyone who knows BMW's). Just need to get it down here. Link to comment Share on other sites More sharing options...
Nabarga95 Posted April 4, 2017 Share Posted April 4, 2017 What a let down. Link to comment Share on other sites More sharing options...
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