Hi, i have a 91 accord EX, this problem started last summer. About three times a week the car will not start. It will turn over but will not start, if i leave it for about 20 minutes it will start right up. all winter the car has started right up with not one problem. Now its summer and its started over again not starting. If you can help this problem please do , thanks.

 

Your description of the problem are classic symptoms of cracked solder joints on the circuit board of the Main Relay.
You will need to remove the cruise control unit to get to the Main Relay.
It is possible to just 'pop' the relay out of it's case and not have to remove it from under the dash.
Look carefully at the small solder connections on either end of the board for circular cracks in the solder joint that feeds power to the relay coils.

 

Where is the main relay and this circuit board? Do you have any pictures?

 

accord this age and prelude are known dying in summer, getting hard time to start. its will start just need times and don't keep on starting, will drain your battery out if you do so.....