03 6.uh oh slow to start when hot

[Gary54ss]

I have an 03 6.0 with about 173k
it starts up good when cold but after it runs a bit, its slow starting anytime afterward till its cold again.

any ideas??

thanks guys

[dhanna6powerstroke]

It sounds like an HPO (High Pressure Oil) issue. Bad IPR valve, o-rings, ICP sensor, etc..

[Gary54ss]

Thanks for the tip, ill look into it

any other ideas?

[Gary54ss]

Ive been reading a little, is it possible that my tune could be causing problems with the ipr??

[fordmasterdieseltech]

normally and hard start hot entails an high pressure oil leak of some sort. you need to monitor your icp when cranking hot to see where thats at. check your dummy plugs standpipes, ipr, bias icp sensor ect.

[m-chan68]

Originally Posted by fordmasterdieseltech

normally and hard start hot entails an high pressure oil leak of some sort. you need to monitor your icp when cranking hot to see where thats at. check your dummy plugs standpipes, ipr, bias icp sensor ect.

Th OP posted he has an '03 truck. High pressure oil system issues on '03 trucks are usually caused by a failed high pressure oil pump itself when they are higher up in mileage. If it's only a high pressure oil system LEAK, you have a d-ring on top of the discharge tube, as well as the quick-connects from the standpipes to the braided hoses, and the from the braided hoses to the straight high pressure oil rails as possible LEAK areas. I agree with the rest of what fordmasterdieseltech posted.

[Gary54ss]

ok, Thankd for the help guys, when i have time im gonna pull it into the shop and see whats up

[StrokenUSMC03]

Ive got a similar problem. New HPOP new ICP NEW IRP pressure checked the system to 150 PSI and still no start when hot.

[Gary54ss]

im kinda thinking its due to my sct tune, you have one as well as i see. anyone else got any ideas??

[ajpu1983]

Originally Posted by StrokenUSMC03

Ive got a similar problem. New HPOP new ICP NEW IRP pressure checked the system to 150 PSI and still no start when hot.

Check braided high pressure oil lines under valve cover for holes. I just had an 03 with this same issue and it was a hole in the passenger side high pressure hose.