7.3L stopped will not start
I have an early 99 F250 SD 7.3L and it has 600k miles on it (all highway at 12 hrs/day). I have a no start symptom. It ran on 7 about 600 miles ago for approximately 5 minutes until I gunned it on the highway where it cleared up. Since then it seemed that one cylinder was weak as the mpg and power was down by 10 -15% as well it shuttered slightly in idle and in gear) Just recently the same scenario happened where I ran it to temperature for 2 hours on a small trip and then shut off for 10 minutes and restarted when it began to run on 7. It ran like that for approximately 1 minute before I shut it off. 3 days later I started the engine and again it was running on 7 for about 1 minute when it began to knock hard and rpm began dropping as if it was going to stall, I turned it off in fear of a hydrolock. I manually turned the engine over to verify it was not hydrolocked and it wasn't. I then removed the valve covers and all glowplugs to do a compression test that yielded numbers of 380- 420 psi, so engine is still good. I pulled DTC's using my superchip programmer where it yielded a 1211 code(ICP pressure were either too high or too low). I suspected a bad injector combined with a low HP oil pressure situation. I then performed a pressure test on the HPOP. I disconnected both high pressure lines from the heads and installed a plug on one and a 0-6000 psi gauge on the other. The glowplugs were also removed and batteries had a good charge, I cranked the engine and after about 10-30 seconds the gauge starts to read and quickly spikes up to 3900 psi and remains there after several strokes. I used the same procedure to test the the passenger side bank with the injector wiring harness disconnected which yeilded the same result. I then tested the driver side and it came up to 2900 psi for about 2 or 3 strokes and then dropped to 2300 psi where it stabilized. I concluded that there was an oil pressure leak in the driver bank. Is this a severe enough leak to drop the HP oil pressure to below the minimum start pressure requirement?
I replaced Hole #2 injectior with a new one and the remaining ones (#4, #6 and #8) with known working injectors from a 2002 and retested the oil pressure system which yeilded the still same result. I do not have a scanner nor do I know anyone with a portable unit. There a re no visible oil leaks on the outside of the engine around the HP line conections, HPOP, IPR and the ICP sensor. The leak must be internal? Being that the HPOP has two outlets is it possible that they are producing different pressures to each other? I wonder if it is smart to plumb in a porta-power hydraulic jack to one port in the oil rail on teis driver side in place of the Ford HP line? This should be able to test the integrity of the high pressure oil system in the driver head specifically? I would expect that if this test was feasable it would require that the key is on with engine off in order that the IPR remains closed, would it work?
Is it possible that the oil pressure rail and porting in ther head could be cracked? This does not seem likely since the original fail-to-run symptom was that it began running on 7 then slowly reduced rpm until it eventually would have stalled (as mentioned I shut it off prior to that).
I am totally stumped?
I would love to hear feedback.