this is the iac off my gsr. my understanding (and from what i saw on my "new" one) is that you should see a white plastic big screw thread lookin thing in that second hole and that this indicates my plunger type thing is stuck plunged. we replaced it with something labeled "90 civic" now i'm starting to wonder. i can see in my helms technical drawings that the B18C and B18B look different and have slightly different hose inlet tubing (B18B doesn't curve left like that, but i don't think this detail is all that important). the drawing makes the B18C look bigger and beefier. i guess now i'm wondering exactly how interchangable these things are since now i apparently have one off an old civic and whether this piece is broken since replacing it didn't immediately fix the problem. (it's a long story. i haven't typed up chapter 52 quite yet. wanna see my prelude TB?). tia and junk.