The junkyard was investigated during the Phantom Racer case.
The Scooby-Doo Show
The gang followed the tracks of the Phantom Racer until they disappeared near the old junkyard. Inside the junkyard, they discovered a jet plane with the engine machine, which was odd considering the junkyard was specifically for automobiles. They entered an old house where they meet the inhabitant, an eccentric old caretaker, who told the gang that the Phantom had recently been haunting the antique car museum, so the gang decided to head there.