My 1990 Civic died while I was driving it. It has spark at the plugs, it's getting fuel to the throttle body (dual point fuel injection), the timing belt looks like new, the motor has good compression and turns over good but it won't even try to start. I replaced the ecu with one I know is good. It's not giving me any trouble codes with either ecu. I was thinking that the injectors may have stopped working. Is this a possibility, and if so, what could cause this? Any help is very much appreciated, thank you.

See if reading sections A and B below helps:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563.html

Where is the 2-P service check connector? The ignition appears to be working OK. I had already done most of the steps that were listed. Thank you for your help.

Under the dash, about 1" from the right kick panel. It will be in a rubber mount.

My car isn't giving any codes. Could something not be working that would cause the injectors not to work that wouldn't set off any codes?

Try cranking the engine for 10-12 seconds continuously.
If the main relay is the culprit it will set a code 16.

The injectors can stick if they sit for a long time.
Usually you can "smack" them (gently) with a long screwdriver and small hammer and they might start to work (if they are indeed stuck).

I think I may be on to something, my manual says I should have continuity between the white wire on the igniter and ground, but there is no continuity there. Can anyone tell me where this wire runs to so it will be easier to isolate where it is broken, or can I run a jumper wire instead of fixing this one?