Car needs to be cranked for a long time to start when warm

[sv650steve]

get a cheap multi meter at harbor freight and test those sensors. Read up on closed loop/ open loop operations in the manual if you have one. There is alot that goes on when starting a car, and it's difficult to know without some diagnostics. Cars switch from open loop to closed loop as soon as there is enough time to heat up the o2 sensors. Also listen for the fuel pump to click on (or use the multi meter to check signal at fuel pump when car is hot). I've also seen circuit boards have failures from cracks in the solder causing problems when cars are hot, but this is usually a pattern failure for particular vehicles. Basically it could be anything with the information you gave, so you have to diagnose some things and come back with more info. You can look at the sensors and just see if they look corroded, and try to clean them up with some alcohol and see if that helps.