problem is there but diagnostics do no good. HELP!! - Ford Powerstroke Diesel Forum
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Old 01-13-2011, 09:50 AM
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problem is there but diagnostics do no good. HELP!!

intermittent missing and no power when problem happens. Turbo is working, fuel pressure is above min acceptable spec at 65, injectors passed test w/engine off, engine running failed diagnostic, removed cat and muffler (not blocked and no change), had EBPS code (sensor was good but fitting was 100% blocked) code cleared after removing blockage, checked injector harness by shaking the wires at valve covers (no change). Problem most often occurs when engine has not had a long time to warm up or truck has been at an Idle for an extended period of time and now it is missing and losing power while driving at a constant speed somewhere near 40 to 50 MPH.
When problem happens I can step on the gas and get almost no response and if I come to a stop it idles rough and RPMs are low about 500 rpms. I have had it in the shop for two days with no resolution and they are out of ideas but are telling me they think it could be the injector harnes with a worn wire or short. Please tell me your thoughts, I am not a mechanic and don't know all the acronyms y'all use in here and honestly don't know a lot about diesel engines. 96 F350 7.3L Turbo Diesel 2WD Auto. Need my truck ASAP please reply with ideas or solutions to this.
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Old 01-13-2011, 12:59 PM
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welcome to the Org...i'm not sure what you're problem is but have you checked the CPS? i'm sure others will chime in with better ideas
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Old 01-13-2011, 01:30 PM
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Have you checked the wiring to the IPR (injector pressure regulator)? It's kind of hard to see, it's a 2 wire plug toward the driver's side, in front of the fuel bowl kinda tucked down into the valley of the motor. There's a little wire retaining clip- flip that up and pull the connector toward the firewall to remove it.
Also, on the front of the driver's side head is the injection control pressure (ICP) sensor- unplug it and see if there is oil inside the connector (there shouldn't be). If the IPR wiring is OK and you find oil in the ICP sensor, try driving the truck with the ICP sensor unplugged and see what happens. It will set the check engine light but don't worry about it, it will go away when you plug the sensor back in.
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Old 01-17-2011, 10:28 AM
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Thanks for the tips! Greatly appreciated! Sometimes all it takes is a redneck that does wrench work in his shop for a little bit of nothing to show up all the shops with all of their engine diagnostics and huge overhead to pay for. Described the problem, he asked me if I have used any oil additive recently. Told him that the shop that usually does the oil changes had used some additive they recommended (don't know the name) and he pulled the plug and changed the oil...PROBLEM SOLVED!!! The additive they used apparently broke down the oil prematurely and the problem was foaming in the oil causing a loss of oil pressure thereby limiting my fuel pressure. Easy fix but everyone I took the truck to wanted to suggested replacing the most expensive parts first, poke and hope mechanics=0 shadetree redneck=1
The other positive in this whole thing is the vast amount I have learned about diesels from this forum-cudos to all who post on here!!!
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Old 01-17-2011, 10:45 AM
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Glad to hear you got it fixed
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