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Hey guys, I found this thing flapping around and don't know where it goes. If I put my finger on it I can feel air either going in or out. Does it go someplace, is it useless, should I plug it? Let me know thanks.

Its hard to tell without knowing what the other end is hooked to. I can't really tell from the picture. It looks like it goes to the backpressure transducer (BPT) and I see another hose hanging from that. The BPT is hooked to the EGR valve under the intake and to vacuum. I can never find the vac routing diagrams around here searching but I know someone did post them a while ago. Maybe someone who has them will chime in here. Also the diagram is on a sticker on the hood if your truck still has it. That will tell you where to hook everything up.

If air is going in that hose you do need to figure out something to do with it. Even if it is just plugging it off with a screw or something.

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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)

MEPR: Man, my 4x4 makes all other LUVs look good

Yeah, I think I have that diagram and I'll check it out. I didn't know what that U.F.O. looking thing was. Thanks!

Right above your hand in the picture there is a clip showing on the under side of the air cleaner that holds a hose that should go up onto a thermo sensor on the under side of the air filter housing. I don't see a hose there, could that maybe be it? Sounds like the other end is to a vacuum source on the engine.