I will try to help you. You need oil pressure when cold or on any start up to get these motors to fire up.
There is high pressure oil pump that needs to be checked to verify that it can provide the needed pressure.
You are going to need a truck shop to help you with this as this is the start of the diag process. These motors have been a nightmare to ford with all the issues. Not something you can do yourself without extensive knowledge of this motor.
There is a web site www. Powerstroke. Com that you can visit to see some of the issues and resolutions.
Roy
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Tuesday, November 1st, 2011 AT 2:36 PM