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I need a hand narrowing down where to start on this 6.0. I recently replaced the ficm and hpop and everything seemed fine. Today i have a crank no start. Ficm is solid got sync but ipr is maxed at 85. Icp does build quickly and holds at 650. Hpop only has 50 or so miles on it I doubt that's the culprit. I wonder if I have a stuck ipr? Anyone have any thoughts.
 

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Having had a similar problem, the ipr is where I would start. While accessing the hpop, some dirt and debris might have found its way in and clogged the ipr. Did you check or replace the filter screen under the oil cooler? Mine was blown apart letting unfiltered oil into the ipr.
 

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Most of the time if you have been into the HPOP and it does this in this short of time it is a contamination issue of the IPR.
 
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