Need help diagnosing car- cranks but doesn't fire
 

Hey, I've got a 1991 Honda Civic Si that I picked up recently. It drove home and started up just fine.

A week later, I went to start it and it would crank but wouldn't fire.

It's got fuel and I can hear the fuel pump when I turn it to the ON position.
It seems to crank strong and I've tried jump starting it too.
Pulled the coils (not the plugs though) and tested them and they all fired.
Put in a different ecu and still didn't start.

I've tested the injector wiring and there seems to be no voltage going through. I've got another main relay that I'll try plugging in tomorrow.

Any other suggestions? I'm leaning towards a problem with the fuel. Things I've yet to test is for fuel pressure and the actual injectors themselves.

The most curious part is that the car ran perfectly fine the week prior- no stumbles, no misses, pulled strong, started quickly and idled smoothly...

Thanks in advance! :)

Swapped in a main relay and still nothing...

Will be checking the injectors as the next thing on the list...

Usually the main relay on a honda will control the fuel pump. You said you checked the injector, is that with a noid light? Have you checked if you have spark? If you don't have both I would think the pick up inside the distributor is dead. If you have injector signal but no spark then it will most likely be the ignitor. Hope this help.

Oh.. Check the fuses!