Preheat oven to 350 degrees. Grease and flour muffin pan. In a large bowl combine the flour, apples, sugar, salt, baking soda and cinnamon. Stir in the oil, eggs, pecans and vanilla extract. Dough will be very stiff - stir until all of the dry ingredients are well incorporated. Fill muffin cups to the top. Bake 30 minutes. Cool pan on a wire rack for 5 minutes before removing muffins.