What should i not eat so i can avoid small bowel obstruction from scar tissue?

No connection: Small bowel obstruction from scar tissue (or adhesions) is caused by scarring that is external to the small intestine, usually caused by previous abdominal surgery or infection. I am not aware that any special diet will increase or decrease the risk of this happening.

Diet is not a factor: Your diet does not affect scar formation after abdominal surgery.