Adam

Pinions are used in many places, not just steering... http://en.wikipedia.org/wiki/Pinion Speed sensors can absolutely go bad.

So I got my intake air temp sensor today... but my Megasquirt's daughterboard (the board with the CPU on it) seems to be dead... I've been having random issues where I couldn't get it to work when connected to the PC at all, usually reflashing the firmware fixed this, but now it won't work at all, I can't even get it to communicate with the Megasquirt... One of the voltage regulators is also overheating when the daughterboard is plugged in but fine when it's not, leading me to believe it's a short on the 5v rail on the daughterboard... Hopefully DIYAutoTune will warranty it, I haven't done anything with this board besides remove it when necessary to access components underneath it, it hasn't even been able to be used to run an engine yet...

Courtesy Nissan has the same part for auto and manual for both 87-95 and 94+ 94+: http://www.courtesyparts.com/25010z-sensor-assy-speed-meter-pathfinder-wd21-1994-vg30e-spd-1994-vg30e-spd-f/10r15/6prlt-p-548956.html?cPath=5572& 87-95: http://www.courtesyparts.com/25010y-sensor-assy-speed-meter-pathfinder-wd21-1987-1995-p-548408.html?cPath=5572&

Picked up some plug wires for this today. The LS1/LS2 wires for Camaros, Vettes, Trans Ams, GTO's, etc won't work with this, they're far too short. The wires I picked up were for the 06 Cadillac Escalade 6.0l, the same vehicle my coils came from. The P/N 4317 coils at Auto Zone have 11" leads and they can get a set with 12" leads if needed. LS1/LS2 wires are much much shorter than this. The Cadillac wires are also a little bit cheaper, I went Duralast and got them for $26.99. I also picked up a set of spark plugs, just stock Pathfinder type. I may expiriment with different plugs at later dates but for now I'll keep it stock. The BMW wires I've been using temporarily are causing a really poor idle which isn't unexpected since my 635csi had a really poor idle. They needed to be replaced but I never did My MAT sensor gets here this afternoon so I'll hopefully be trying to start it yet again.

Installed the wideband into the Pathfinder today. The plug that I gave them to install in the hole for the new bung was tightened so hard I couldn't get it out with wrenches, I had to use vice grips and a hammer. Idiots. Oh well, it was only $20 to weld the bung on anyways. Started thundering and pouring as soon as I started routing the wires for the controller through the firewall so I stopped for now. I'm waiting on my manifold air temp sensor anyways, if I don't have one it'll cause issues down the line.

Got my wideband O2 sensor bung welded in today for $20. I won't have time to do anything today but tomorrow I should be able to try some more stuff. I really just have to figure out the offset angle for tooth #1 on the DIYAutoTune wheel. It's 90 degrees from TDC so I'm going to try that and 270. If neither of those work I'm just going to start changing it 20 degrees at a time until I start to get close to right. This could very well get a lot simpler in the future, they're working on getting the Nissan optical CAS wheels working since a LOT of Nissan motors use them. It's supposed to be fully working in 1.1 firmware but they're only on 1.0.6 beta right now.

What's wrong with homebrewed? and ABS plastic?

So I set up a coil with my Megasquirt here on the bench, used my distributor with the DIYAutoTune sensor wheel and I'm getting spark... So now I have to figure out why I'm not getting spark while it's in the car... Perhaps I'm just not getting spark at the right moment?

Just a quick update, I had the wiring correct on the coils. I used my JimStim with a 1.5a 12v power supply, connected the coil to the 12v output, the ground, and used the 5v output to trigger the coil (just tapped the wire to the coil), hooked up a spark plug to the coil, grounded the plug to the JimStim and it fired the spark plug no problems. Now I have to figure out why my Megasquirt isn't firing the coils...

Went ahead and put it back to stock today, took me less than half an hour. All it took was removing the LS1 coils, removing the new optical wheel in the distributor, replacing the rotor and distributor cap, remounting the stock coil and igniter and plugging the MAP vacuum line I installed. Fired up first try. I love the simplicity of all of this. I need to replace the CPU in my JimStim so I can't really afford the downtime while I troubleshoot the problem with no spark.

Yep, just confirmed I wired them backwards http://forums.audiwo...d.php?t=2175190 edit: damnit, I'm not even sure anymore. I posted on LS1Tech to see if anyone can shed some light on it, there's so much conflicting info out there because these coils aren't super common.

May have wired the coils backwards, I'm not 100% yet but I've seen mention that they're wired like LS2 coils, which are wired opposite of LS1 coils... I assumed they were wired like LS1 coils so I'll probably have to rewire... Related, here's the ignition wiring harness. Red wires on the bottom of the image are the +12v wires, green wires (and one brown) are the ground wires and the colored wires in the loop are the signal wires for the individual ignition coil triggers. The wires wrap around the top of the engine and look pretty clean when everything is connected up...

I think I've figured it out on my own, I just realized I need to hook up the secondary trigger from the crank sensor wheel... Nope, still no spark...

Well, I know all the sensors I hooked up are working, everything is showing up on the screen. The exhaust reeks of fuel so I know the injectors are firing, unfortunately I'm not getting any spark. I've checked everything and it seems that the Megasquirt isn't even sending the fire command over the signal wires... Reached out to the MS3 forums for help.

OMG I got it! I'll explain the TPS wiring and the crank sensor tomorrow when I figure out exactly which wires are going to be wired to which plugs.

Just confirmed it's not the CAS, I'm getting a jump in the multimeter when I check voltage across the 12v pin and the trigger pins, meaning the sensor is working properly. Definitely an issue on my Megasquirt...

Well, I can't even get an RPM signal with the JimStim, which is made to send a signal like that... Not good, gonna have to figure out where I went wrong with my crank sensor circuit...

I figured out the throttle position sensor. Red wire on the TPS is 12v, black wire is ground and the white wire is the signal. It works beautifully now. Still can't get the crank sensor going. I've tried 2 different methods to pipe it through on the Megasquirt and it's just not working. One method involves treating it like a VR sensor but providing 12v power to it, the other is the actual optical sensor circuitry that comes with the Megasquirt. In both cases it's just not working... I'm not sure if maybe I have it just hooked to the wrong input or what but even then, I can't get it to register a voltage drop with my multimeter when the optical sensors are closed off by the plate...

I'm not sure what's up with this crank sensor but I just can't get it to work properly...

I went ahead and brought the distributor and the throttle position sensor in for some bench testing...

Having troubles already, it doesn't pick up the TPS and I'm not sure I'm using the correct crank sensor. About to check the logs. I also didn't realize the stock wires don't even make a connection to the coils, I had to grab a set of my BMW wires I had sitting around, which also means I had to take the caps off the plugs so they could attach to the threading.

I'll have some more info tomorrow on how I mounted the LSx coils. I'll also have some other minor info on the wiring and other such things. Can't really update that stuff right now because it's dark and everything is out in the Pathfinder! And thanks, I like to share my knowledge no matter what I'm doing. Don't see the point in living in a bubble if I can help others!

Didn't manage to finish it today but I'm very close. Got all the wiring to the cab, need to wire up the coils and the O2 sensor. The coils are one of the easiest things. Still need to read up on how the O2 sensor is wired.

Been working on the wiring harness for the coils. So far I've soldered all the ground wires, then I hooked the wires up, routed them where I wanted them to go and electrical taped them in place. Now I can build the hot wire and the trigger wire into the same shape and tape it all up without having to stand over the Pathfinder the whole time.

I've been able to mount the brackets to existing bolt holes with little to no modification I had to drill out a single hole on the brackets so I could run a bolt through it instead of threading the bolt into it but otherwise it all lined up quite nicely. This will enable me to run LSx wires so ignore the crappy wire routing