7.3 must be plugged in to start

[Mustang1]

For a full year now. I have been having to keep my 2002 7.3 plugged in before starting. If it is 90deg out I'm usally ok but will still run ruff for 5 to 10 min. If it gets below 70deg, if its not plugged in for more than an hour, it takes for ever befoe starting. If its 50deg and below, must be plugged in for at least 2 hours.

I have replaced glow plug relay, glow plugs, starter, alternator, fuel filter, air filter... Dont know the issue. I thought it might be a fuel problem and have been running fuel additive every so often thinking I have a stuck injector or something with no luck... Some one mentioned possible high pressure oil pump...Any suggestions??

[2001 stroker]

Same problem not as bad but 50 deg and below its a gamble if it will start or not unless plugged up. Replaced glow plugs, relay, mod,idm, 2 injectors, and wiring harness, new battery. What is left?

[2wd_sled_puller_dmax]

run a compression test

[lineman85]

i have the exact same problems with my 2000 7.3. cant find any answers. xcept mwhen i try to start mine it blows white smoke out the exaust when cranking. cant plug it in at work so now have to start it with a shot of either every day when i get outta work. let me know if u find out anything and i will do the same

[loudtruckguy]

read 02 hard start