2002 F250 7.3 wont start below 40 degrees - 2002 Ford F250 Super Duty SuperCab

Will try to help. your engine glow plugs are most likely the problem, when youcycle the key on, it says wait to start on dash panel right? it means it, the glow plugs preheat the cylinder to fire the fuel when it turns over. you should heva an electrical plug under the front part of engine , the plugin heats the oil during cold weather to insure a smoother start for the motor. i do suggest you use anti-gel in your fuel and please follow the instructions on the bottle that you can purchase at any auto parts store. replace your glow plugs[ they are easy to replace] they are located above the cylinders almost like spark plugs in a gasoline engine. only smallet in size. if you are mechanically inclined and can replace spark plugs in a v8 motor, you can do this yourself, but be prepaired to pay $100.00 for the glow plugs and i also suggest that after replacement, you wait for the wait to start light goes off on dash before you attempt to start the engine. it's a very common mistake. hope this helps and thank you for choosing fixya.com if this helps a 4thumbs up would be great