99 7.3 ICP to high

[Injected79]

Hey guys, haven't posted on here in a long time, but I have a 7.3 tossing me for a loop.

99 f450 6 speed

Codes
P1211 pretty constant
P1209 intermitten

KOEO
Icp 0-10 psi
Icp voltage .22-.25v
Ipr duty 14ish %

When truck starts up, icp will initially be around 700 psi, with in say 10 seconds icp climbs to 2600ish psi, in the mean time, IPR duty drops to 4%, icp voltage if I recall correctly mid 3v to low 4v.

Customer was battling a no start issue to start this process, AFTER he tossed some parts on it prior to contacting me, I went and diagnosed an IDM issue, replaced IDM, truck starts but has this icp issue, and runs rough below 2500-3k rpm, smokes, injector knock.

I Replaced icp sensor, original had some oil in sensor, customer had replaced ipr with a cheap internet special ipr, I reinstalled oem ipr, same issue no change. Pulled sending unit, checked strainer filters, cleaned reinstalled.

Buzz test passes and sounds good,
Fuel pressure 55-70 psi
Oil black but full
Swapped ecm, same icp/ ipr issues

Any ideas :shrug:

 

[Gnathv]

Have you unplugged icp to see if it changes, may be icp pigtail if oil was in icp.

 

[CJunkie]

It's still going up to 2600 psi at idle?

Sent from my LM-V350 using Tapatalk

 

[Injected79]

With ICP unplugged there is a change but it's still not right by any means also when I'm plugged the Ipr duty cycke back to 14% if I remember correctly ,and yes does not drop below 2600 PSI if it's been running for more than a few seconds.

 

[Addicted4]

Are checking pressure with a scan tool or a mechanical gauge?

 

[Magnum PD]

Has the customer used any sealant for anything? Have you checked the edge filter in the HPOP? Does he have big oil?

 

[Injected79]

Checking pressure with AE software, and the truck is 100% stock with 145k miles on it.

 

[KBMKVIII]

I would ohm out the ipr and icp harnesses

 

[Addicted4]

Try unplugging the opt with it running. I wonder if the hpop could fail in the wide open position or if it’s electrical like stated above.

 

[Magnum PD]

My bet is stopped up edge filter.

http://powerstrokearmy.com/forums/attachment.php?attachmentid=329&d=1307148441

 

[Injected79]

I never ran into the edge filter before, but I do believe you guys are correct. I finally pulled it back into the shop last night, and just bc of my curiosity I unplugged the IPR with it running, to my surprise it had no change and continued to idle roughly even when unplugged.

From what I have read The Edge filter is not serviceable is that correct?

 

[Magnum PD]

If you take out the plug there’s a pretty good chance that the threads will be damaged and will leak if you reinstall it.

 

[Addicted4]

Send it off to terminator and have it turned into a t500, or replace with a adrenaline. Factory pump would suffice but I would go with the aftermarket. Wonder if it’s possible to send debris into the injectors would be my next concern.

 

[Magnum PD]

Didn’t think Terminator was doing much now.

 

[Addicted4]

Went thru my hpop earlier this year. But he is only a text away.