2006 6.0... No start.

[331stroker]

Ok, so a buddy and I have been fighting with my truck the past few weeks trying to get it started. It would randomly start for him and when I'd go to start it, it just cranks and cranks until batteries get weak. I charge the batteries up, check oil and no oil on the dipstick after 2 weeks of checking it and adding less than a quart when it showed it on the "add line".

Well I decided I'd just do an oil change because it was almost to that point and tried to fire it up. Unsuccessful, so we tried a very little amount of diesel magic (ether) and nothing. Icp sensor was recently replaced but cts shows only around 300 icp psi when cranking.

Making too much pressure for me to think bad hpop, so I was thinking ipr. Suggestions please!

It usually throw the same 4 codes every time:
P1378
P2285
P2291
P2623
I figured these were all common codes for low battery voltage, slow cranking, low injection pressure.

[twoicebergs]

If you keep cranking and the voltage gets real low, you will get all of those codes with very slow cranking! However, with fresh batteries, that is telling you something is wrong. What is your FICM voltage when cranking, the first code says it is too low? It is possible this is not firing the injectors and when you continue to crank and get slow cranking the 3 ICP codes trigger. If the FICM is good, attempt to try to start it with the ICP disconnected is the PCM sends a false signal to the FICM to help start it and diagnose an ICP or wiring failure.

If it all checks out, and your pressure is still low, you have a HPO issue.

[331stroker]

Yeah, FICM volts have always been strong. And when I tried unplugging icp it still wouldn't start but showed over 1000 icp psi.

[Bluedemon6.0]

What is your icp pressure if it is below 500 then you have either a bad ipr valve, a wireing problem at the ipr or high pressure oil leak. I hear the sct fittings are junk on this year truck or it could be dummy plug o ring or stand pipe. I'd say pull the ipr valve and inspect screen, if all is good do a high pressure leak check. If all of this checks out you probably have a electrical issue.

[331stroker]

That's kinda what I expected to hear.

[Bluedemon6.0]

Any update? Did you find the problem?


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[331stroker]

Working on it tonight... I've been super busy with the show pigs.

[331stroker]

Should I be able to spend the ipr valve with my hand? I can't loosen the nut itself but the plug on part can spin.

[Bluedemon6.0]

Yes it will spin about 180*.


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[331stroker]

She's running again. The plastic for the screen was broken and it was about to fall off when I took the valve out. I went ahead and replaced the entire valve.