Join Date: Jul 2007
Location: Tampa, FL
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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:
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.