my accord wont start! HELP!!!

[doownek]

ok, so heres the deal. this use to only happen maybe once every few months so it did not bother me to bad. but its happened 4 times in 2 days and its realy starting to get to me. here is was happens. i got to start the car, and the engine fires up for anywhere from 1/4 to one second then dies right away. usaly if i pull the key out and try again the engine turns over and does not fire at all. i pull the key, and start again, it will either fire for a monent and die or not fire at all. i keep dooing this and the car would usally start by the 10 th try or so. it would only take a minute or two of work and it would start. so since that did not happen often it did not bother me. but its been happening a lot lately, and the last time it took over an hour of screwing with it. sooooooo i dunno whats the problem is, anyone have any suggestions as to what the problems could be??? the only thing i recal about all the situations was it was rather warm outside, so i dont know if that has to do with it or not. also i i checked the ECU and it did not come up with any code's for me ;-( (i found my speed sonsor was bad by dooing that) but its not blinking a code at me.... so i am outa ideas any suggestions would be nice thanx

90 accord EX
180K miles