another Question on 89 civic hb

everytime i drive mycar more than 30 min and i turn off the car and then try to start it again it turn over but does not start but iwait like5-10min it finally starts but i replaced the starter a month ago andijust replaced the radiator two what can it be

I guess it could be you baterry

no itsnot thebattery

i know some body knows what wrong with it

main relay
had the same problem

where that at