ECM wire connectors

[imalumberjack]

I'm working on a 2013 Pete with a cm2250 ISX 12. So I decided to check the wire harnesses on the ECM, there is three blocks that each are held in with a 5/32 allen head screw, two of these are tight, the third? it wiggles? I tried to tighten allen head but its tight? this is the lower one that is two in a row and attached somewhat to upper (engine side). I have tried loosening upper one and when it comes loose I keep turning and the screw pushes connector out, when I loosen lower (that does not tighten) it does the same but when I tighten it the allen head gets tight like it should but plastic block still slops around loose? Lower is down in frame rail and difficult to get out and I'm doing this in the snow :-( so can someone explain what is in connector block? could the outer shroud just be loose? or is the whole connector loose? maybe allen head is bottoming? Is it pins or blades inside? Thx