I have fixed these very inexpensively, by digging down on the outside coating the wall THOROUGHLY with a thick layer of tar based water proofing and then laying a very heavy layer of plastic wrap vis-queen, which over laps two or three feet on either side of the crack.
I believe this works better than the injection stuff because the injection stuff hardens and could potentially allow for leakage if there is movement of any sort in the wall that cracked.
If you can get a better membrane, which no doubt they make, perhaps that would work better.
Then if you are dug down to the weep drain at the footing, make sure it is not plugged. Then using a piece of plywood fill the inner 6 or 8 inches of the wall surface area of the hole with pea gravel as you backfill the outer area, pulling the plywood up every 8 or 10 inches as you go. Lastly cover the pea with a good membrane that prevents the pea gravel from being plugged by sand/clay, or use straw which will last many years. This will work like a lightning drain down to the weep tile along the base of the foundation.
Then grade the dirt two to three inches per yard so that it slopes away from the wall, all the way around. Next be sure that the down spouts are carrying the water far enough away that it doesn't pool up next to the house when you get a soaker. Or worse because of soil conditions, simply soak in and travel right back toward the basement.
Finally if you happen to be in one of those sandy vanes of soil with clay on either side running right toward the house you might as well consider your home sittin on a river which will let the water travel thru the sand toward your home...in this case, you will need to do the French drain thing where you create a barrier to this flow-age by putting a foot wide pea gravel trough around the home complete with a tile at the bottom to carry to a lower area of the yard or street. If you don't have any place that is sloping away, you can put a sump pump pit at the junction right in the yard then pipe electric to the pit and use the sump to kick the water up to a drain that can slope away from the home.