Originally Posted by Tacomarunner
I have an 07 6.0, 145,xxx miles, starts fine when cold, runs great. But after it has warmed up, it will not re-start after shut down. I know there are a few things that can cause this: Bad ICP, leak in the HPOP(STC fitting, leaking o-rings). No codes other then codes from EGR delete. When I did the delete I also changed the MAP, IAT and EBPV sensors. MAP sensor I broke lil nub hose plugs into, IAT was all gummed up from busted EGR cooler. EBP changed for maintainence. I am getting her scanned on Saturday. What am I looking for as far as normal parameters? If parameters are correct, how can I verify that it is a mechanical leak?
Being an '07 model year, I will tell you you already answered your own question. Either and/or (STC fitting, lower o-ring on dummy rail plugs). Monitor ICP volts, ICP psi, ICP desired, IPR duty cycle & RPM. ICP volts should be between 0.15 & 0.35 at key-on/engine-off and climb to MINIMUM 0.8 as you crank the engine over to start it. ICP psi should read 0 psi at key-on/engine-off (obviously) and climb to MINIMUM 500 psi.
If your IPR duty cycle maxes out at 85% and you still fail to reach 500 psi, that confirms that you have a mechanical leak in the high pressure oil system.
The part numbers from Ford for the STC fitting kit is 4C3Z-9B246-E, and the dummy rail plugs are -W302195.