I have a 2005 F250 I have been working on. I cant seem to get it right. It came in as a no start/hard start. A shop who knows nothing about diesels and has no right working on diesels took the truck in thinking they could fix it. They replaced an oil rail, three injectors, the hp oil pump and over all kinda butchered the truck. They gave up after it ate their *** and brought it to us. Turns out the injectors they installed were for an 03 6.0, so we put three new injectors back in, his original oil rail, and a new pump. The installed the pump and cross threaded the bolts for the stc fitting. We got the threads fixed and put that back together, and replaced the oil cooler. We put it back together, after a few long cranks the truck fired off. we let it run for about half an hour and shut it off. It wouldn't start back up. I then pulled the front pump cover, it had some deep grooves, so I replaced the pump the front engine cover and the front pump cover. Again I put the truck back together and it fired up and ran. once we shut the truck off it wouldn't start until it was cold then it would fire off, we also pulled the pan and pulled out so much thick nasty sludge and put the pan back on. (the same sludge that was in the pan was in the sump when I replaced the oil cooler). We replaced injectors six and eight, injector six had some gel or something in the cup. we once again put it back together and it fired off and ran...again. we shut it off after about an hour and it actually fired off, but watching the icp on the scanner it instantly loses oil pressure as soon as you shut it off. so after a few long cranks it starts. This truck is supposed to go to cuba in a few days and we are still at square one. Any one else had this problem?

 

Air test the HPO system for additional leaks. Make sure it has an OEM filter and cap. Pull the IPR valve and check the screen for additional trash. Post the IPC/IPR values. Any codes?

FWIW--I don't think the system is supposed to hold HPO pressure at KO.

 

When you replaced the STC fitting, are you SURE you repaired the threads properly? Did you air test the high pressure oil system to confirm the system is AIR TIGHT? How about the dummy rail plugs in the rails? Were they replaced with the updated style?

I suspect answers to the questions above will get you ahead of your current issue. HOWEVER, I would be more concerned about the source of the engine oil contamination as well as the deep grooves found in the engine front cover/low pressure oil pump assembly. Did this engine lose the circlip on the original failed STC fitting and get sucked up through the oil pickup to damage the front cover, or worse yet, did a failed roller lifter needle bearing get sucked through?

 

Have the dummy plugs been replaced?

 

I'd start with checking oil leakage at the dummy plugs and stand pipes. However, the sludge and scarring you report are more of a concern to me. Maybe the scarring is old.

 

Whike idling ipr reads 27% icp dsd is 580 actual fluctuates between 576 and 584. All stand pipes and plugs are good. When you shut the truck off icp drops to 0 almost instantly

 

Got it figured out. I replaced injectors 1, 5, and 7 put it back together and it starts almost instantly. When its hot.