07 6.0, No Re-Start After Warmed Up

[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?

Thanks,
Russell

[m-chan68]

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?

Thanks,
Russell

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.

[Tacomarunner]

Hey thanks, M-Chan. These o-rings on the dummy rail plugs, passenger side and driver side? AWWW the joys of pulling the top of the motor off again. Should I have just changed these parts the last time I had apart due to mileage, or are they just something that goes?

Thanks again.

[m-chan68]

Originally Posted by Tacomarunner

Hey thanks, M-Chan. These o-rings on the dummy rail plugs, passenger side and driver side? AWWW the joys of pulling the top of the motor off again. Should I have just changed these parts the last time I had apart due to mileage, or are they just something that goes?

Thanks again.

Yes, there is one on each bank of cylinders. You need a 10 allen key to remove.

[Tacomarunner]

One more question, if there is a mechanical leak, will sensors read correct?

[m-chan68]

Originally Posted by Tacomarunner

One more question, if there is a mechanical leak, will sensors read correct?

They SHOULD. That's why I mentioned to look at the above mentioned values while you're at key-on/engine-off.

[Tacomarunner]

Thanks again M-chan! A tech @ his finest!

[Tacomarunner]

Got her on a scanner to today, all parameters were in spec except the the cranking volts of the ICP.

ICP @ key on engine off: 0.25
ICP @ cranking: 0.56
ICP pressure @ cranking 2k plus.

Is this enough information?
Would this be a bad sensor?

[m-chan68]

Originally Posted by Tacomarunner

Got her on a scanner to today, all parameters were in spec except the the cranking volts of the ICP.

ICP @ key on engine off: 0.25
Seems to be well within spec.
ICP @ cranking: 0.56
Here's where we have a problem. 0.56 is definitely short of the minimum 0.8 volts needed to start the engine.
ICP pressure @ cranking 2k plus.
???? I don't understand this information

Is this enough information?
Would this be a bad sensor?

Okay. Now what about ICP psi? What is your IPR duty cycle at HOT engine idling? Typically, it should be between 21 to 23%. Any higher than that, indicates a high pressure oil system leak causing an elevated duty cycle. As I indicated in my previous post, it sounds like you have a high pressure oil system leak somewhere, that needs to be pinpointed and repaired.

[Tacomarunner]

The cranking pressure of ICP was 20xx psi (?). While ideling it was 40xx plus. I believe I noticed the IPR @ 25 % while ideling. Unfortunately I didn't write all that down.

A leak could lead to the low voltage reading even though the cranking PSI on the ICP is in spec?

Thanks again.