Try some google fu and search ford f150 5.0 pinging. There are a bunch of people complaining about it. Some think it's actual pinging, others think it something else. One point did come out of it though, what type of fuel are you burning? Most say that burning hi test gas makes the issue better (which it would if it is actually pinging.) One post had this supposedly from the owner's manual:
For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. The performance gained by using premium fuel is most noticeable in hot weather as well as other conditions, for example when towing a trailer. See Towing (page 285).
Do not be concerned if the engine sometimes knocks lightly. However, if the engine knocks heavily while using fuel with the recommended octane rating, contact an authorized dealer to prevent any engine damage.
Try checking out your manual, it may be normal. Surprising though, I'm driving a 15 Jeep Grand Cherokee with a 5.7 hemi, I've never heard that ping, but they do recommend mid grade fuel.
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