accord intermittent start

My 99 Accord would not start yesterday. Turned over just fine, just
wouldn't start. Usually a very reliable car.

Had it towed to dealer and now it starts just fine. Dealer still has car.

What would cause intermittent start problem?

99 Accord 4 cyl EX
72000 miles

 

Main relay,runs the fuel pump.
Google for 'main relay',there are some sites that show how to re-solder
it's bad solder joints and save $50 not buying a new one.It's EASY.

 

------------------------

When our Odyssey (same engine, I think)did that to us, I wasn't sharp
enough to look in the owner's manual, but I never would have thought of
_flooding_ in the warm season either. Turns out an injector can stick
open, or just dribble and flood the engine overnight. The simple way to
start it is to hold the pedal to the floor and crank it for up to
fifteen seconds. Manual says so. I ran a few tanks of gasohol (also in
the manual) thru it, and the problem never happened again.

If, however, you have a bad main relay you can tell because you don't
hear the fuel pump while the 'lamp check' (see manual) is happening.
With key in the II position, smack the dash and the fuel pump will run,
proving that the relay needs to be resoldered. The car will run until
you shut it off next. They are also very temperature-sensitive, so they
often start showing up in the first warm days of Spring.

'Curly'