Compression Ignition Addict
Join Date: Dec 2007
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While oil in the connector is a sign that the internal seals are starting to fail in the ICP, it doesn't mean the sensor is no longer doing it's job.
A 1211 can have Many causes, the ICP being one of the least of them coupled with that 60% IPR. It would be telling me you're starting to have trouble maintaining pressure under max load. Typically this means that either the HPOP isn't capable of making enough pressure (bad HPOP or it's running short of oil) OR the good pressure it IS making is being bled-off by either a bad IPR or injector O-rings that are starting to fail.
Figuring out this can be a challenge, you can take the IPR apart and try cleaning it, you can pull the valve covers and watch the discharge from each injector for excessive oil coming from one with a bad ring (these can both happen with more as the oil thins and rings soften as the engine Heats Up). Those are some Free tests, next you have to start to really dig in to the system...
from the "Dieslemans Site under Tech Info"
Loss of power, usually after a hard acceleration; Rough idle; Check engine light comes on, DTC P1211:
Intermittent high pressure oil leakage.
This condition usually occurs when the vehicle is cold and the oil is thick. When performing a hard acceleration, the truck suddenly looses power, the check engine light comes on, and once returning to idle the engine runs rough and won't accelerate. Cycling the key may correct the concern, clearing the code from the PCM will correct it temporarily. If you can monitor data stream, at idle the ICP pressure normally is 400-700 PSI and the IPR duty cycle is 9-14%; at cruise, ICP is 700-1200 pSI and IPR is 15-20%; under normal acceleration, ICP is 1200-2000 PSI and IPR is 20-30%; and under WOT accel, the ICP is up to 3600 PSI and the IPR is 35% or higher. When the above symptom occurs, typically the idle ICP reading will be normal, but the IPR duty cycle will be high--over 20% and up to the max 50%. A "blow-by" condition has occured somewhere in the HP oil circuit. If you can get the problem to re-occur with some frequency, the most probable cause is worn or deteriorated injector or IPR o-rings. If the problem is intermittent, it could be a sticking IPR valve. Replace the injector o-rings with the latest-level kits--F8TZ-9229-AA. When replacing the IPR, make sure you get the correct part for the build date/serial number of your engine.