Rep Power: 0

My Grandson's Civic won't immediately re-start after shutting it down when it's warmed-up...has to cool down for 20 min. to 1/2 hour before it will start again....cranks over very well when warm, just doesn't fire....is there a coolant temp sensor that would cause this like on my Saturn, or is the culprit more electricaly-oriented? Anybody had to diagnose this one before? Thanks in advance if anybody's able to help..

 
Rep Power: 188

check main relay...could be a loss in the fuel pressure..Could be a leak in the injectors or fuel pressure reg or something like that..would have your fuel pressure checked..

 
Rep Power: 0

Thanks for the response, Gunner....when you say Main Relay, are you referring to the Main Relay for the fuel pump, or another main relay I need to look for under the hood?

edit: As far as leaks go, everything's tight under the hood, no leaks showing at all...

 
Rep Power: 188

The main relay for the fuel pump.. things i have seen cause this problem are

fuel pressure regulator
bad injectors
Leak in the fuel system.
bad ignition control module(not as common)
Bad grounds on main battery ground(not as common)

 
Rep Power: 0

Thanks for the info! I'll start with the fuel pump main relay, then see if I can find someplace to test the fuel pressure for us...