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personally, i don't think it's a leak. you'd see ipr full closed if it were, always. for some reason, the pcm is not closing it. it must be either the input (icp sensor) or the pcm itself. however, if it were the icp sensor, it would be contradicting the reading on the monitor and ultimately, the pcm. which really only leaves the pcm.
while the problem were occurring, commanding the ipr closed manually, right at the valve, and cranking would confirm this if it did fire up.
this is also a problem hot or cold, since you say it hasn't run since.
this is all under the assumption that the readings you have provided are accurate.
something tells me, unless the dealer has a decent tech with a fair knowledge on the 6.0l, that this may go misdiagnosed. please do let us know what they say before any repairs are performed
personally, what i'd do if this were at our shop, is install an ipr blocker and crank. see if pressure builds then. if it does, i know which route to start to follow. if it doesn't, ipr blocker still installed, pull the valve covers and air it up. if no leaks were detected, i'd be looking at an hpop. not very common on an 05 though.
this would all be after confirming low side oil pressure, of course
dannyboy, you are right. icp is inferred when a fault is found by the pcm. a safety precaution i reckon. as for the inputs for the inferred reading, i'd suppose app, eot, rpm, map, maf. the usual inputs for load cal.
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Last edited by kaya; 12-22-2012 at 04:20 PM.