Fixing a 2nd gen 3sgte harness / preping for my swap, no, its not going in Jenns car, its going in MINE! ;) Options

[presure2]

so yea,
as most of ya know, we recently did up a 3rd gen swap for jim and as "payment" he gave me his 2nd gen setup.
as most of ya also know, this setup was originally RJB23's car, which was pretty much a mess from the day jim and shannon bought it.
Click me for details of that story

so once we got the 2nd gen motor up here, it has been sitting on a stand, waiting its turn.
i finally got around to getting the harness off, and am starting to get it cleaned, stripped, repaired, rerouted, rewrapped, and reloomed.
like everything else about the swap in that car, this engine harness was no diffrent, and in defense to the guy who did it (IIRC DGperformace did it) it did work, it was just routed and wrapped all crazy, and the ECU end basicly looked like a birds nest from people troubleshooting the ecu and wiring while it was in the car.
so i started tearing into it, and dustin came by last night and helped me get the interior plugs sorted out, since there was lots of "dead" (wires that go to nowhere) wires in the harness.
i also removed all the stuff i wont need or use, including all the ac stuff, TVIS, TVSV, ect.
once that was done, i went about cleaning and fixing any loose or broken wires, (there were a few, one of which wouldnt allow the car to start with the key...lmao) and rerouting and rewrapping it, getting it ready to be reloomed.
here are a few pics of how that is going.

first, the before. sorry for the blurry pic, its the only one i took..lol



this wire was in the harness that was routed behind the intake manifold, instead of inside of it, like it should be, and chaffed on the IM until it broke..just so happens this is the wire that tells the starter to crank. yes, jim, this really is why your car wouldnt start with the key! lmao



how the ECU side of the harness looks now:



and some of the leftovers:


and just for refrence, a pic of what a stock USDM 3s harness looks like, for an idea of what this one should look like when its done.


ill keep updating this thread and adding pics as i go along and continue with the project.

[lagos]

I noticed a potentially horrible mistake that a n00b could make when wiring the harness...

Manny, in your fuse box, from the EFI relay you should see 2 black wires with yellow stripe. Are both of those wires soldered into a Y into another black wire with yellow stripe or is just one of them connected and the other one left hanging?

I'll have to double check to see how my harness was done, but those 2 wires really MUST be connected into a Y. That wire sends out power to all kinds of EFI related functions, but on our 6th gen fuse box those wires are very thin gauge compared to the wire they get connected to in the 3sgte harness. If someone was to make the mistake of connecting only one of them, they could end up sending power to the fuel pump, COR, tvis, etc... through one skinny 16 gauge wire! With our upgraded fuel pumps, you could end up with serious voltage drop! Connecting the 2 wires into a Y at least beefs up the wiring before it gets connected to the thicker 3sgte harness wire.

This is also a great reason why us swappers especially should rewire our fuel pumps to run new fused wire directly from the battery along with its own relay as was recently posted on mr2oc.

[presure2]

I noticed a potentially horrible mistake that a n00b could make when wiring the harness...

Manny, in your fuse box, from the EFI relay you should see 2 black wires with yellow stripe. Are both of those wires soldered into a Y into another black wire with yellow stripe or is just one of them connected and the other one left hanging?

I'll have to double check to see how my harness was done, but those 2 wires really MUST be connected into a Y. That wire sends out power to all kinds of EFI related functions, but on our 6th gen fuse box those wires are very thin gauge compared to the wire they get connected to in the 3sgte harness. If someone was to make the mistake of connecting only one of them, they could end up sending power to the fuel pump, COR, tvis, etc... through one skinny 16 gauge wire! With our upgraded fuel pumps, you could end up with serious voltage drop! Connecting the 2 wires into a Y at least beefs up the wiring before it gets connected to the thicker 3sgte harness wire.

This is also a great reason why us swappers especially should rewire our fuel pumps to run new fused wire directly from the battery along with its own relay as was recently posted on mr2oc.

nice catch art.
when i swap, i was planning on running new wire back to the pump anyway, what im thinking is to use one of the empty fuse blocks in the fuse box, and run it back to its own relay ect.
although, in my harness, the only thing that the EFI relay goes to is the COR, ecu, and fuel pump.
the way dave wired up the starter relay is really funky, it dont use the switch at all, its all wired in thru the coil side of the relay. he left the ST starter wire connected to the starter relay, but didnt wire in the 3sgte starter switch plug to it.
ill have to get a pic and MS paint it to show ya what i mean, its really odd.
i keep saying it the more and more i play with the harness. its amazing this car even ran, the way this harness is wired.
ohh and somthing you need to know.
if dave exended your harness, art, its missing the shielding around the distributor, injector wires, knock sensor, and o2.
the sheilding was just cut away from the corresponding wires, and he just extended the wireing with all the other wires in the harness.

and we wonder why these 2nd gen swaps seem to run great at times, and like ass at others..