won't start when warm.

[psdguy95]

Hey guys. Im trying to diagnose a 6.0 that won't start when warm. I'm new to the 6.0 so bare with me. It starts and runs great when cold. If I shut it off when its up to temp and go to restart it it just cranks. My scan tool shows low icp compared to icp desired when cranking. I'm also getting no smoke at the exhaust when cranking. FICM shows 48-47.5v. Cam and crank sensors are good. I'm thinking I have a HPOP leak somewhere. Any input will help.

 

[ghohouston]

Most likely gonna be one of these.
1: stand pipe/dummy plug orings are cut, and truck needs new stand pipes and dummy plugs, because they may be the old style.

2: ipr issue

3: stc fitting or orings under hpop

 

[HOOV3R]

Year? If 04.5 - 07, it's more than likely standpipes and dummy plugs.

 

[psdguy95]

Sorry. Its a 2005 e350 van

 

[psdguy95]

If the orings are cut why would it start cold but not hot?

 

[dieselmac]

When it's cold, the oil's thicker and won't leak by the o-ring fast enough to prevent pressure from building.

 

[ghohouston]

When it's cold, the oil's thicker and won't leak by the o-ring fast enough to prevent pressure from building.

Bingo! Ive seen it happen countless times on 6.0's

 

[psdguy95]

Ok. Thanks everyone. Ill check it out tomorrow.