Hi!
I have a 2013 buick lacrosse 2.4 Ecotec engine (I think it’s the same as your Equinox’s engine). It unfortunately has pretty low compression on 2 of the cylinders (to be exact the readings were cylinder 1 is 160, 2 is 142, 3 is 100 & 4 is 110).
The car still runs fine but is obviously on...