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Hello and thank you for your question,Are you able to connect your scan tool to the computer system and see what the fault code and or codes are that should be setting when the check engine light is coming on?
Thank you for that, are you running a performance chip?
Okay then you have a couple of things going on here. The code P1316 can be set due to any of the following with the under Valve Cover (UVC) Harness being the most common cause. Have him run the steps since the harness is new and see if this will help him narroe this down.
Your 7.3 should have the under cover harness and if that has not been looked into then it needs to be. These codes would not keep setting if in fact the problem is resolved. I would still run the steps I sent you to see if you can get these codes to clear.
Give me a moment and Ill post them for you. What you needing is the engine control circuit wiring.
Okay , have a look at the enclosed diagrams for the engine control system. This should be what your needing.https://dl.dropboxusercontent.com/u/104923897/7.3%201%20Aug%204.pdfhttps://dl.dropboxusercontent.com/u/104923897/7.3%202%20Aug%204.pdfhttps://dl.dropboxusercontent.com/u/104923897/7.3%203%20Aug%204.pdfhttps://dl.dropboxusercontent.com/u/104923897/7.3%204%20Aug%204.pdf