So, I just pulled the engine from a '90 Loyale, and put it in a '87 GL wagon. Everything matches up fine (both were throttle body fuel injected), except the wiring harness. According to Chiltons, it should be exactly the same. Well, the two engine harness connectors have all the same colored wires, just different shaped plugs. So I chopped the chassis plugs from the '90 and soldered all the wires to the same color wire from the '87 chassis, so it'll plug into the '90 engine. But then I get to the little four wire plug to the distributor. Those colors aren't the same. Neither quite matches the Chilton's color code, but the '87 is alot closer. Hmmmm. I checked the third car ('89) to see if that helps, but it's the same colors as the '90. Any suggestions on how to connect the '90 distributor to the '87 wiring harness?

I had to do something like this with a engine swap in my RX. The disty's were different. The wires that go into the disty are plugged into the bottom. Remove the rubber grommet and I think 2 screws then unplug it, then replace with the other harness.

Turbone is exactly right.

Update: Turbone is right, but I took the easy way out and just swapped disty's. Fired right up.

 

For more info, I was getting an 11 and 13 code when it wouldn't work.