Hi Gang,

SGII arrived today and just finished adding the critcal X-gauges. Here's the poop.

ICP 500 PSI
IPR 77.6
FICM 48.5

ICP fluctuates from 485 to 502 PSI. IPR maxes at 77.6 and stays there. FICM starts at 49 and drops to 48.5 on crank. Shouldn't the IPR be at 85 if it's trying to make more pressure?

Well, where do we go from here? I'm thinking of powering up the IPR with an external plug then try cranking. See if she starts and note the details.

Thanks all,

Paul

 

Boy you are right on the Edge of stARTing ICP value is very close

you have a HPO problem

you can also program FPW Fuel Pulse width it will stay 0 till ICP high enough then it will give reading when enough HPO to turn on FICM


But HPO Problem

IPR maxed out

 

Have you tried to unplug ICP and start it yet?????

 

Thanks Benny,

I haven't unplugged ICP yet as it is a bugger to get at. I asked in the ICP plug thread if I could just apply 12VDC to IPR to close it, which is what unplugging the ICP would accomplish via the PCM. Am I correct in this assumption? I can get at the IPR plug easily and have a connector from the wreckers. Easy to close the IPR.

Cheers

 

NO Sir^^^^


When you unplug ICP sensor the PCM will throw in a Deferred Value Mine was in the 900psi range anyway that will let the FICM Turn On and Turn injectors On

so if its the ICP sensor screwing the PCM up then if it does start the sensor is Bad

But I will throw some Caution at your case

Since your truck does start sometimes with the ICP still hooked up that may throw a wrench into the Gears so to say

But rtry unplugging it and check the ICP wire pigtail if its Oil Soaked wire pigtail then sensor is Bad

I dont think you will get off that easy replacing ICP (unless oil soaked threw) but its a step that must be Taken in Diagnostic procedure

 

OKay,

I understand now. PCM gets data from ICP to turn on other functions and if ICP fails, puts a 900 or so PSI figure into the computer and fires FICM and all other required functions to start. A limp home mode. Didn't realize this. Okay, will unplug the ICP before work tomorrow and report back.



Paul

 

Paul i would pull the IPR and check it . Once you have a socket made it not nearly as bad as the ICP . But with your high IPR % it might be stuck open .

 

Thanks David,

Went out this AM and started it and watched the SGII data. Here is what I got. First, it started again!! Yeah!

Engine cold. Outside air at 12C.

Crank speed 180RPM for about 5 seconds then...
ICP 631 IPR 77.6

Caught and started
ICP 700 IPR 77.6

Idle Cold
ICP 1000 IPR 32.6

Idle Warm
ICP 640 IPR 23.2

2000 RPM
ICP 1100 IPR 33

Shut it off with EOT at 170F.

Tried restarting
ICP 230 IPR 77.6

So, that's the update. I will try the ICP plug and IPR removal today and let you know. Will pick up a cheap 1 1/16 socket in town for the IPR and make the adapter.

Thanks again all,

Paul

PS David, would the above indicate that the IPR is functioning correctly, if the % is varying? Or is this % data what the computer is sending to the IPR and it really could be stuck. I also noticed a bit of a stumble at 2000 RPM, a random miss. mmmmm

 

Its hard to say on the IPR it dont have a Position sensor so to say

best way to pull and check the screen for damage any clogged ripped torn or hole in screen best to replace the IPR

My bet is on an Oring somewhere that leaks

 

OKay one quick update,

Pulled the ICP plug today, thanks to Dad who came up with a great method to easily pull it (PICS to come soon). PCM defaulted to a display of 2215 PSI and IPR indicated 66%....no start. Bugger.

So, I then reviewed the bills/history for the truck. Bloody hell. The HPOP, ICP and IPR were JUST replaced 1500 miles back, last May 2011. Small town shop stated "not developing high pressure, suspect HPOP or oil leak." MMmmm, ya think?? 4 pumps over 3 years???? They replaced the HPOP and shoved it out the door.

Anyway, I'm now thinking the o-rings in the oil rails, stand pipes, and ARG, branch tubes. This is definitely a Monday morning 6.0L.

Cheers
Paul

 

Hello Folks, I'm new here and my 6.0 won't start when warm either. I want to try disconnecting that ICP thing but where do you find it? Can you even get at it without disconnecting the turbo? Also, I seem to have air at the secondary fuel filter, when I loosen up the cap I hear some air hissing out, that sure don't seem right! Then, if I turn the key on with the cap off she spews fuel, so I know I'm gettin' fuel to that point anyway! I bought this pickup 2 years ago, and I'm startin' to think I just should've spent the 15G on my old pickup [93' F-350 7.3] I used to be able to figure that one out on my own fairly quickly! I bought a Chilton manual but that's just a dissapointment! Shows very little of the 6.0. So, any help from you guys here will be greatly appreciated! Thanks, Carl B

 

Hey Carl, welcome to FTE! I would suggest clicking " new thread" on the first page of the 6.0 diesel forum and describe your problem and include info on your truck. Year model is especially important. Sometimes you don't get an answer right away but this place is waaaay better than a Chilton.

 

Well, before I tear the engine apart I decided to try one other test this AM, cold. I applied power to the IPR then then started the truck to see what ICP would read. I think from the results the HPOP is okay. It started right up and went right to full relief at 4000 PSI. I shut it right off. Started it again and then pulsed off the IPR. It still showed 3500-4000PSI so I think the HPOP is okay. After another 10 second run I shut it off and reconnected the truck harness to the IPR and it ran at about 1000PSI at idle. Ran it about a minute then shut off and tried to restart, no go at only 400PSI on ICP reading. So I think I have a leaky o-ring somewhere. I cut down the 1 1/16 socket today and will remove the ICP tomorrow and put in 140 PSI air and see where the leak is.

I'll keep ya posted.

Paul

 

Hi Guys,

Spent part of the day trying to find the M12x1.5 adapter and finally found something that will work. Applied 130 PSI to the ICP port and made the air leak test. Started out with IPR off, major air coming out both valve covers. I then applied power to the IPR and noticed just a hint of a change. nothing major like I expected. With the IPR on, still major air coming out of both valve covers. Not just a minor leak but enough to feel with my hand, both sides. It's amazing this thing runs!!?? This test was with the engine cold, not run for 2 days. I don't know how it starts then has 4000 PSI with the IPR on full (with my test plug) but has so much air passing through the system.

Am I missing something?

Experts, please step up and shine for me (us). There are a few watching this thread with similar problems. David (wolfman), any progress with your truck?

Thanks...and as always...cheers,

Paul

 

Found the leak!! And I was right...it's BIG. HPOP to cover o-ring...only 1500 miles and less than a year on it since it was all changed.




So, this was pointing right at the IPR..is there anything I can do to prevent this happening again? Or do you think it was an error on installation? Maybe the cover is out of round??



Anyway, thanks all for your help! I will make another post when I get cleaned up and tools away. Bugar ya know, shops are closed now until Tuesday. I could have this running today if stores were open. Oh well, time to contemplate other mods while it is apart.

I will also post some tips for removing parts etc. I remember a few posts stating they had problems with the intake manifold and a few other things. Hopefully my input will save some future grief for someone.

Cheers

Paul

PS, I know this is day old news now, but I wanted to complete this thread for those subscribed to it, or searching for help later on.