I had some rather large cracks in my poured walls as well. We repaired walls and replaced carpet many times. We tried hydraulic cement, digging out the outside of the wall and sealing with tar, many other fixes. Nothing worked until one contractor suggested epoxy. He drilled several holes along the length of the crack, inserted what looked like a grease fitting, and injected the epoxy throughly. That was 5 years ago and I haven't had a leak since.