Re: 2006 6.0 30 sec + crank no air leaks.
It isn't going to hold pressure if the IPR
valve is open.
The idea isn't really to hold pressure, it is to push the oil out of the rails and listen for leaks. best to do the test w/ hot oil also (and w/ the valve covers off). That said, do you have ICP
readings that say your issue is with the high pressure oil system?
In other words, do what longjonsilver posted. Get a monitor (doesn't have to be a ScangaugeII) and post data.
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