New Alltrac Owner Project

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Things to try first

Wiring harness
3
60%
Distributor
0
No votes
Bad Ground
2
40%
ECU is shot
0
No votes
ICM or something technical with the ignition
0
No votes
 
Total votes : 5

New Alltrac Owner Project

Postby TomatoSupra » Fri Oct 16, 2015 11:33 am

Hello everyone. I'm going to post all my project stuff here, and hopefully keep everything organized. Now keep in mind i am VERY new to turbo vehicles, and project cars. All of the cars i've owned so far ran and drove before i bought them.

Ok, for a little background, the car is a 1990, 80K on the odometer, has a 3rd Gen 3s swap, (HKS mushroom intake, 3 inch turboback exhaust) and the owner did the swap and was unable to get spark. Car turns over, and sounds like it has good compression.

11749332_10206717695442194_235064117_n.jpg


11778110_10206717667361492_772479134_n.jpg


My goals right off the bat.
1 - Get it running (Duh)
2 - Get it driveable (Wheels, tires, rotors, brakes Ect)
3 - Last but not least, get it all cleaned up and pretty. (Fix cosmetic stuff, put radio in it, ect)


So here's all the info i have so far on why its not getting spark.

Previous owner tried swapping distributors with another 3s, and tried swapping ignition coils. Also tried plugs, wires.

My main goal tonight, is to get the numbers off of the ECU in the car, and find a wiring diagram for it. I had a buddy of mine message me right after i got it and said that i need to "Re-pin the engine to body harness", so it sounds like i may need to get pretty technical right off of the bat.

Once i verify his wiring job on the harness, i am going to move in the direction of Easy/Cheap to Hard/Expensive. Hopefully it won't take me that long to get it figured out, and i can get it up and running this winter.

Like i said earlier, any advice, comments and questions are welcome and appreciated!

Dan
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Re: New Alltrac Owner Project

Postby zaluss » Fri Oct 16, 2015 4:10 pm

I had the same issue with my 3rd gen swap but without knowing who the did the wiring, it could be anything. I would start with checking the 12v to the ignition coil and igniter. If theres no 12v, check the grounds. If everything checks out, you gotta bust out the wiring diagrams.
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Re: New Alltrac Owner Project

Postby plourdem14 » Fri Oct 16, 2015 4:32 pm

I had a similar problem but it was with a 2nd gen. Like the guy above me said not knowing who did the swap it could be anything. In my case just some engine bay wires that had become brittle and lost connection. I have a few more kinks to work out but that is what it came down to for my no spark issue. Check any clips that are related to the spark system, wires coming off the fuse block and I'm sure if a 3rd gen has one but there is a plug coming off the bottom of the dist IIRC in 2nd gens, that could be worth a look as well. I guess if you don't find anything you could methodically go through and check continuity of wires related to the system as well. If it's body harness wiring it shouldn't be too bad I'm sure theres at least a few guys on here who have done your swap and can point you in the right directions and probably even get you diagrams.

Good luck hopefully it works out.
1990 GTS swapped 3s-gte RC
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Re: New Alltrac Owner Project

Postby Street_Chally73 » Sat Oct 17, 2015 7:11 am

Congrats on the recent purchase! It looks like a relatively clean car and hopefully you're able to figure out the no spark issue without dropping too much money. GL!
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Re: New Alltrac Owner Project

Postby ChrisD » Sat Oct 17, 2015 11:27 am

Congrats! Always interesting taking over on a project. I'd run through the engine bay to see if there was anything obvious, then check the ecu pins to double check what exactly they did there. And yes since its unknown, check was ecu they are using too. Have fun with it!
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Re: New Alltrac Owner Project

Postby 760gt4 » Sun Oct 18, 2015 2:09 pm

If your troubleshooting leads you to a bad wiring harness and not a fault ignitor, coils, etc, the easiest and maybe fastest way to get it running would be to send your harness to Wiregap and have him fix it for you and in the meantime address any other issues you may have. Once you get your harness back, plug it in and it should be up and running.
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Re: New Alltrac Owner Project

Postby TomatoSupra » Mon Oct 19, 2015 11:24 am

760gt4 wrote:If your troubleshooting leads you to a bad wiring harness and not a fault ignitor, coils, etc, the easiest and maybe fastest way to get it running would be to send your harness to Wiregap and have him fix it for you and in the meantime address any other issues you may have. Once you get your harness back, plug it in and it should be up and running.


That's a good idea. However, i would have to call and make sure that they do this swap. But if it comes to that, that's what i'll do.
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Re: New Alltrac Owner Project

Postby 760gt4 » Mon Oct 19, 2015 11:29 am

He's done that swap countless times. Go to wiregapinc.com and you'll see most of the swaps he does.
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Re: New Alltrac Owner Project

Postby TomatoSupra » Mon Oct 19, 2015 11:53 am

760gt4 wrote:He's done that swap countless times. Go to wiregapinc.com and you'll see most of the swaps he does.


I didn't see it in the pricing sheet, but im sure if i call they will say that they do that.

So im guessing i just need the ECU serial, the Motor Serial and send my harness in to him?
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Re: New Alltrac Owner Project

Postby 760gt4 » Fri Oct 23, 2015 12:41 am

Just tell him exactly what you're trying to do. He usually needs the new engine wiring harness and the stock engine harness, and he'll merge them. You won't need to send out your ecu. He's done just about every swap into alltracs and mr2's so you should be good to go after he's done with it.
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Re: New Alltrac Owner Project

Postby msanders2 » Fri Oct 23, 2015 3:16 am

Another MRP alltrac!!!!!!

You don't have to send Doug 2 harness' you can just pull the one off the guy who tried to do the swap has on the motor and If there is anything wrong with it Doug will fix it.
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Re: New Alltrac Owner Project

Postby 760gt4 » Fri Oct 23, 2015 10:05 am

I was gonna add that but I was half asleep when I wrote it haha
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Re: New Alltrac Owner Project

Postby TomatoSupra » Fri Oct 23, 2015 11:05 am

Thanks for the advice guys, I actually think it will be more of a pain in the ass to take the harness off, but if it has to come to that, then it will.

Yesterday, i had a few minutes, and managed to get the ECU out, and snap a picture.

1. Is the this right ECU i should be running?
2. How can i find the wiring diagram for it?


ecu resized.jpg


Thanks!
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Re: New Alltrac Owner Project

Postby underscore » Fri Oct 23, 2015 5:48 pm

The part number says it's a JDM ST205 ECU, so that should be the right one for the swap.
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Re: New Alltrac Owner Project

Postby TomatoSupra » Sat Oct 24, 2015 11:42 am

underscore wrote:The part number says it's a JDM ST205 ECU, so that should be the right one for the swap.


Awesome! OK, so that's the first step. Just to confirm, i just need the ST205 wiring diagram, and the diagram for the st185 body harness correct?

I also noticed when i took the ECU out, there was a wire dangling from the harness, like not plugged into anything. I think i am starting to believe that the wiring is the issue here. The good news is that none of it looks hacked apart, or torn into, so i should have a "good" harness to start with.

Thanks for the help!
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