You actually can't advance or retard timing on your truck without pulling the timing gears off and manually doing it. however, if you adjust too far you can cause severe damage internal damage to your engine. and the computer is going to try to automatically adjust for whatever adjustment you make. If your question is provoked by a poorly timed engine, ie its running poorly, then i would suggest replacing your timing chain and I always replace the tensioner while i am there as it isn't the easiest thing to do. if you need to know the proper timing let me know.
I’m happy to assist further over the phone at https://www.6ya.com/expert/brock_d67526d2a834c47e
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