Piston Slap: Tapping and Clicking Fuel Injectors?

Walt writes:

Sajeev,

I wrote to you five years ago about a frozen Ranger parking brake, and later on about the incredibly dumb idea of purchasing a vintage Mustang with a loan. Thankfully, the former resolved itself, and the latter remained a pipe dream. What I did do, however, was buy a ’14 Mustang GT with a 5.0-liter Coyote V8 and six-speed manual. It now has around 9,800 miles.

At around 3,000 miles it developed a clicking noise at idle, audible with the driver side window rolled down and a curb or jersey barrier to bounce the sound back at me. The frequency of this click increases with engine revs. Existence of this issue with the 5.0-liter Coyote is well documented on F-150 and Mustang forums alike.

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