2018+ Coyote V8 engines have linerless cylinders with plasma arc coating and aluminum forged pistons. Big screw up design by Ford.
Go to dealership for a warranty claim, scum bags will send you away with these TSBs:
TSB 19-2144 5.0L - Engine Knock Type Noise At Idle
Some 2018-2019 F-150 and Mustang vehicles equipped with a 5.0L engine may exhibit a light to
moderate knocking type noise at idle (600-700 RPM) that is sometimes described as a quiet diesel type
sound. The noise is usually more prominent on the passenger side of the vehicle toward the rear of the
engine. As the engine comes up to operating temperature, the noise level increases slightly. This noise is
not detrimental to engine function and has no short or long term effects on engine durability. This an
operating characteristic of the 5.0L engine and no repairs should be attempted.
SSM 47787 - 2011-2019 Mustang/F-150 - 5.0L - Tick Tap And/or Typewriter Noise At Idle
Some 2011-2019 Mustang and F-150 vehicles equipped with a 5.0L engine may exhibit a ticking noise at idle after an engine oil change. It is often referred to as typewriter noise because of its similarity to the sound of a mechanical typewriter. The noise in question may be heard on some engines when engine temperatures reach 150°F (65°C) or higher and engine speed is at idle up to approximately 1700 RPM's. It can typically be heard at the front wheel well, and is often isolated to the transmission bell housing or oil pan area. typewriter noise is not detrimental to engine function or durability and has no short or long term effects on the engine. This an operating characteristic of the 5.0L engine and no repairs should be attempted.