Car wont start when warm out starts when its cold out?

Hi Crubino,

If the engine cranks and will not fire up, you need to confirm if it is fuel or electrical related.

If it is fuel, check the main relay for power output to fuel pump when ignition is turned for two seconds or while cranking.

When problem occurs, does check engine light goes off after two seconds when turning on ignition switch?

If it cannot crank, check battery terminals, starter and ignition switch.