I have a 1992 eh civic that starts sometimes, I have tried to check ECU but no where to check fault codes,if I leave it 15 to20 minutes it might start. It just cranks over and not firing. It has fuel,spark.

Does the Check Engine Light come on for 2 seconds and go off normally, when the ignition switch is turned to ON? During this 2 second interval, do you hear the fuel pump run and the main relay click?

Yes I have checked tat, I can hear the relay click

Since the CEL does not stay on when you turn the ignition switch to ON, I would focus on the distributor. Specifically, I would replace the Ignition Control Module (ICM) and coil:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-4.html#post265896

I recommend replacing these problematic components every 120,000 miles or 10 years, whichever comes first.

Since the CEL has not come on, there are no codes stored in the ECM.

Here's how you check for codes, if one was thrown:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-6.html#post832012