Okay, I pulled my engine recently from my 88 TII and unhooked the harness from everything on the engine and once I finished my upgrades and repairs I dropped the sucker back in... Well, here's my problem, I didn't take pictures or anything during it all to use as a reference to remember what went where. Right now, I just need some sort of harness picture diagram to help ensure that everything goes to the right wires/connecters. Also a picture diagram that could show me where all the major grounds on the car are located would be great as well. I have studied the factory service manual and I did not see any type of picture diagram for help. If anyone can post it or at least post a link to what I need, I would be very grateful.

Side note: I have everything connected right now and I think it's pretty straight, but I am now only getting spark from my trailings coil igniters and nothing from the leadings. I replaced the leading coil igniter and I started getting some spark from them, but then I lost all spark from the leadings again. I believe this is ground-related, but I need to overlook EVERYTHING to know for sure. Also, I have blocked off all valves on the LIM and UIM. So a lot of this wiring is unused now.

 

Ok let me see if I have this straight. You removed all emissions and solenoids too? I will try and post on everything like this.

First the coils are controlled by ground. They keep 12v+ all the time and switch ground to complete the circuit. The only thing on the motor that controls spark is the CAS. This being bad is likely. Next is the ECU the wiring and the coils / igniters themselves.

As far as wiring you can get diagrams from the FSM. Check the FAQ. I will try and word it out for you too. When I removed my stuff I removed the leads out of the harness completely, so I will try and put this together form memory and what I have left.

You have a large bundle lead that heads off to the PS and I think this one carries the BACV and ACV wiring. At the Y where this split off you should have the leads with the fuel injectors, this lead carries the 2 injector sets and the O2 sensor, the clip in this lead that looks like -| goes to the IWS motor on the back of the UIM. The lead with the O2 sensor goes to the injectors closest to the fire wall the other lead into here caries the water thermo sensor, this cap is identical to the BACV but has a longer lead. This set also caries the temp sensor on the top of the thermo-stat neck and caries down to the oil sensor part next to the filler neck. Right here is a -| shape connector that goes to the ALT. In this bundle are all the solenoids that go to the VAC rack. The long 16ga wire that should be yellow red stripe with a bullet connector is the temp wire and goes to the driver side of block next to the oil pressure sending unit. There is an eye loop with two 16ga wires that are black. This bolts down to the rear rotor housing in one of the 12mm bolt holes. Not part of the harness is a 16ga wire that bolts to the middle tranny bolts and the rear iron and uses a spade connector bolter to the middle of the fire wall. This grounds the motor to the body.

The AC, Oil Temp sender, and the power steering are part of the body harness.

I did this out of memory so if I missed anything guys let me know.

 

I'm definitely going to invest my time into checking ALL grounds and rewrapping any slightly damaged wiring as well as replacing anything too severely damaged. If this doesn't work then I'll have the coil tested. I just replaced the ECU so I'll find it hard to believe it's dead, but ya never know... if still nothing, then I'll be back here again looking for help.

 

Ive spent weeks chasing no spark. I had 3 bad ECU's. Finaly broke down bought another and it was good.

 

What I did when my engine was out is lay the harness over the block with the UIM, IC bracket, rats nest and alternator off. that gave me a rough idea of where everything was supposed to be routed. from there it was trial and error. I think I only missed 2 connections, the o2 sensor and the ACV plug.

get your hands on a factory service manual. it can help to an extent.

there are a few websites that have the FSM available for download. I think FC3S.org may still have it and iluvmyrx7.com as well....