1. Preheat the oven to 350 degrees F.
2. In a bowl, add and combine karo syrup with eggs, sugar, vanilla extract and butter. Mix until well combined.
3. Stir in the pecans and mix well.
4. Take the 9 inch pie crust and pour the above batter evenly into the pie dish. Bake this in the oven at 350 degrees for 60 - 70 minutes or until firm.
5. Once done, remove and cool the pie before serving.
6. Serve this karo pecan pie sliced in desired pieces.