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Old 10-23-2013, 03:11 PM
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04 No start

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Working on this truck I just picked up. 04 6.0 auto. It just died one day and wouldn't restart. Only made 300psi high press oil so it seemed like it would be a simple fix.

Only code worth mentioning is p2617, crank pos sensor. I swapped in a spare from my parts motor, no change except code went away.

It has
Crank,
Good batt's,
60psi fuel,
48V+ Ficm
Brand new HPOP, will build 4k+ psi if the ipr is manually grounded, otherwise will build a max of 350psi.
ICP reads press so I assume its good, swapped one from working truck, no change
IPR assumed good, swapped in a spare, no change.

Swapped pcm from my other 04 6.0, no change, still only building 300-350psi hpo.

Engine harness checked for frayed/cut wires. Looks good
Injector harness check for frayed/cut wires. Again, looks good.

That's where I am at, still no start, wont even fire.

Idea's?

I do not have a way to measure ipr duty cycle. Im going to buy AE, im getting readings from edge insight currently
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  #2  
Old 10-24-2013, 12:21 AM
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Quote:
Originally Posted by dukedrummer89 View Post
--------------------------------------------------------------------------------

Working on this truck I just picked up. 04 6.0 auto. It just died one day and wouldn't restart. Only made 300psi high press oil so it seemed like it would be a simple fix.

Only code worth mentioning is p2617, crank pos sensor. I swapped in a spare from my parts motor, no change except code went away.

It has
Crank,
Good batt's,
60psi fuel,
48V+ Ficm
Brand new HPOP, will build 4k+ psi if the ipr is manually grounded, otherwise will build a max of 350psi.
ICP reads press so I assume its good, swapped one from working truck, no change
IPR assumed good, swapped in a spare, no change.

Swapped pcm from my other 04 6.0, no change, still only building 300-350psi hpo.

Engine harness checked for frayed/cut wires. Looks good
Injector harness check for frayed/cut wires. Again, looks good.

That's where I am at, still no start, wont even fire.

Idea's?

I do not have a way to measure ipr duty cycle. Im going to buy AE, im getting readings from edge insight currently



need 500psi to crank over otherwise no starting... you have a high pressure oil leak somewhere, common places: blank/ dummy plugs, and stand pipes. all located on hpop oil rail.

watch these their not from the infamous powerstrokehelp guy this is a reliable diagnostics video on :crank/ no start issues...

part 1:

part 2:

very very helpful info esp regarding: ipr, icp, and he goes into detail about what a 6.0 needs to just crank and start and how to find root cause of no starts with the 6.0.
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  #3  
Old 10-24-2013, 06:24 AM
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The icp reports to the pcm what yor oil pressure is, if it is bad and not telling the pcm the actual pressure it will assume the icp reading is right and will not allow the ficm to fire the injectors no matter how good the oil pressure actually is.

Field test unplug the icp with no signal at all from the icp the pcm will use a default value of around 650 psi and will start. Basically it will lie to itself that it has over the 500 psi min.
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Old 10-24-2013, 06:01 PM
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I think I figured it out after updating my edge so I can read ficm sync and ipr...

Ipr stays flat at 14%... so its not going to make any pressure. Tach on my edge registered for a second and the IPR jumped to 85%.... I thought that odd...

Ficm sync is at 0. That's where my problem is.

Replaced the pigtail on the cam sensor (insulation missing near plug), no change (Ive got lots of spare parts around for these motors)

Inspected the wiring on the crank sensor (see pic, exposed, corroded wiring)... Obviously this is where the problem is.



Now how the heck do I get in there to replace it? Remove the AC compressor?
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