I would definitely 2nd La Placita de Durango for tops Norteño grub.
If you are looking for something closer in/ Pilsen range, you likely won't be bowled over, but Perez is an old standby of ours. The Randolph flagship is our go-to for easy West Loop post art opening margaritas and chips and salsa. The Pilsen outpost has a few advantages though: open Sundays, handmade tortillas, and hotter salsa. Most dishes are serviceable: tortas, enchiladas, and steak plates all scratch that middle-of-the-road Ameri-Mex itch. A few things shine: their salsa negra (even better than the rendition at the departed sit down Pasadita), micheladas, the shrimp soup can be on, and breakfasts, in particular the chilaquiles and my favorite plate of huevos in Chicago, huevos machacado (though the beef is not as jerky-like as LPdD as seen above).
I might call ahead about hours tomorrow.
Perez
1163 W 18th St, Chicago, IL 60608
(312) 421-3631