[underpowered]

extra crank time that cold is not bad IMO. my 00 7.3 powerstroke will start without being plugged in down to about 0, once it goes negative it starts to get harder to start. as for glow plugs, you don't have to cycle them, the light goes off just to say it should start, but they will continue to stay on up to 2 minutes, even once the light goes off they are still actually on so just leave the key on for a bit longer and try to start instead of cycling it again.