Combine tomato ketchup, hoisin sauce, and honey in a small bowl. Set aside.
Place pork loin chops in a single layer on a baking tray. Sprinkle all over with salt and pepper on both sides.
Brush marinade on both side of pork loin chops. Allow them to marinade in the refrigerator for one hour.
Preheat grill to high. Brush some oil on the grates.
Place pork chops on the grates and close the lid. Grill pork chops for 5 to 6 minutes. Watch closely to avoid flare-ups by opening the lid occasionally. Move pork chops to a different part of the grill to avoid charring if flare-ups occur.
Brush the top of the pork chops with vegetable oil. Then, flip them and grill for another 5 to 6 minutes.
Transfer pork chops to a platter. Cover loosely with aluminum foil and allow them to rest for 5 minutes before serving.