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With the 89 ECU, you should also have an OBD diagnostic module mounted near the driver's side strut. Run test 3 from the OBD.
http://www.swedishbricks.net/700900FAQ/Engine-Codes1.html
Diagnostic Test Mode 3: Injection System Component Activation Test
Turn the ignition ON to KPII and install the cable into socket 2 for fuel-injection-related tests.
Press the button three times for one second each time (waiting between >1 and <3 seconds before pressing again)
The diagnostic unit then tests selected components: engine coolant fan (if equipped), fuel injectors, idle air control solenoid valve, carbon filter solenoid valve (if equipped), cold start valve, radio suppression relay and fuel pump, each of which you can hear or feel.
Exit by switching off the ignition.
You should hear the injectors clicking like crazy for about ten seconds. If so, the radio suppression relay (RSR) is working, and the ECU is firing the injectors. (The only source of + power for the injectors is the RSR.) If no injector clicking, then simple test the RSR. Put your finger on it as someone turns the key to KP II and then off several times. You should feel it clicking on and off. If not, replace and re-test.
Good luck.
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