91 Civic - error code light question

Hi guys, been driving my very thirsty 350 Chevy and with gas at 103.9 here, I really want to get my Civic going again. I had originally posted that I was not getting a code from the blinky light under the passenger floor mat, now I think I may know why. I finally was told by someone that when the key is first turned on, the light should flash once to say 'hi there, I work'. Mine doesn't. New computer? BTW, my original problem was lotsa crank, no spark. Thanks for the help, Gord