Spark plug broke in the motor
Ford 4.6L 3v & 5.4L 3v Broken Spark Plug Removal - YouTube
Lisle Ford Broken Spark Plug Remover LIS 65600 (Alt 303-1203 303-1398) | Lisle (denlorstools.com)
Denlors Auto Blog » Blog Archive » Ford Spark Plug Removal Tool – Picture of Ford’s Bad Design (denlorstools.com)