Low Injector pressure issue - Ford Powerstroke Diesel Forum
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Old 01-05-2012, 02:10 PM
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Low Injector pressure issue

Ok, I have searched many many threads and chased all the likely culprits.

Vehicle: 2001 excursion 7.3 psd, 175k miles

I am getting injector pressure over/under, can't remember exactly(not IDM failure), and truck is "ok" on power. No oil in the valley so I ruled out the HPOP orings. I put the AE on it and checked some things out:

ICP cycle is 64% at WOT, but injector control pressure is about 1300. When you lift off the throttle, the pressure jumps to over 2500, but only for a half a second or so.

So far I have:
Removed programmer
Changed oil, and verified level
Replaced fuel filter
Replaced IPR sensor
Cleaned, checked and reinstalled the injector pressure valve
Checked all connections
Replaced CPS with international one

So I figure I am down to HPOP or injector orings, I opt for orings and open it up. The oil blowoff was coated, as was the intake from there to the turbo, also some oil in the outlet tube of the turbo. Low and behold, someone has been in there before, looks like injector 8 was replaced, and the "clip" was put into the UVCH plug.

Started it and it seemed ok, no major oil splashing about(I was hoping for some obvious thing).

I pulled the injectors and they look uhhh, not so good. Pics are of two different injectors, one of which is #8. They all appear to be "carboned" up on the side that faces toward the exhaust. The tips all look like this too. Should I replace the orings, or get reman injectors? I really don't have the money right now for injectors, but also don't want to do this halfassed.
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Old 01-06-2012, 10:16 AM
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You are already in that far. Replace the o-rings: Riffraff Diesel: Alliant Injector O-rings

But more than likely, this is going to turn out to be a worn HPOP. Your best bet depending on your power goals is to put in a T500. You can get a reman HPOP from Ford but my experience has been that almost all the reman pumps leak. That and an HPOP from Ford isn't the cheapest thing in the world. Riffraff Diesel: Terminator T500 HPOP
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Old 01-06-2012, 12:11 PM
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I already have the O-rings, that is why I opened it, to replace those, but I am a little concerned about the injectors. Having not seen any others, I don't have a comparison.

I am trying to avoid the HPOP for some mental block, but would use a modded on if I am going to do it.

Nice truck btw, mine had a 7" lift and 35's on it; I took it back down to stock, and really miss it. I was hoping for some better mileage and towing performance(I tow a 38' 10k enclosed trailer); but gone none of that.
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Old 01-06-2012, 02:19 PM
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For the miles you have, the injectors don't look that bad. The o-rings won't hurt but I don't really think that's your issue. Maybe you'll get lucky.

And thanks for the compliment. I'm surprised you didn't see a mileage improvement. The lift and wheels/tires killed my mileage.
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