03 wont start below 45 degrees has new glow plugs and relay

[DENALI]

The truck is an 03 with 198k on it. Brand new glow plugs and relay and all are functionaing as they should but the truck will still not start if its under 45 degrees and not plugged in. It only takes about 30 minutes of being plugged in and it will start right up. Also the truck runs like total **** when it first starts but does run perfectly as it warms up. Not sure what the problem could be so i am hoping for some insight from you guys. Thanks

[dhanna6powerstroke]

FICM is junk. Check the FICM voltage while cranking and see what it drops to. Anything less than 46v is junk. Also make sure batteries are fully charged and good. Bad or weak batteries will kill an FICM.

[russelltevans]

Have you tested the uvch to see if they are ok. I'm guessing this is a 7.3 so I dont think it has an ficm. Not sure if The symtoms are the same for a bad idm or not.

[dhanna6powerstroke]

I looked at 03 and not the forum it was in My brain defaults to 6.0 when I see 03

[DENALI]

Originally Posted by russelltevans

Have you tested the uvch to see if they are ok. I'm guessing this is a 7.3 so I dont think it has an ficm. Not sure if The symtoms are the same for a bad idm or not.

Yesi have tested both of them and they are both good.

[Carpenoctum]

Any codes? Low oil pressure maybe?

[kraker829]

Something is wrong with gp system. you have to double check the whole thing. Make sure it's wired correctly and everything is actually working. Probably something simple.

Sent from my SPH-D710 using AutoGuide.Com Free App

[DENALI]

Originally Posted by Carpenoctum

Any codes? Low oil pressure maybe?

Nope no codes. Oil pressure seems to be fine.

[DENALI]

Originally Posted by kraker829

Something is wrong with gp system. you have to double check the whole thing. Make sure it's wired correctly and everything is actually working. Probably something simple.

Sent from my SPH-D710 using AutoGuide.Com Free App

I have double checked it and had a Ford tech check over the whole glow plug system as well. He is stumped as am i

[welove2drive]

Check out this thread titled (2000 F350 7.3 4X4 No Start)

2000 F350 7.3 4X4 No Start

I have been having the same problem. I have new GPR, all 8 glow plugs, UVCH, ICP sensor, CPS. I did the seafoam treatment a couple of times and than changed oil and added some engine cleaner. While it is still not totally corrected yet it has improved quit a bit. May not be your problem but it would not cost much to find out. I have some Archoil on order to finish off with so I'm hoping to get this thing starting as it should soon.