Thread: Hissing from IACV?

Is it supposed to sound like a hissing sound? I think that may be the problem with my rough idle if it's not..

nope. I found a rather large vacuum leak coming frrom the aac valve where the wires come out

Is it possible you have a diagram of the lines or something? I can't seem to find anything on it.

I notice that you can hear it more when unscrewing it while adjusting it..

mine was leaking from the aac..the golden hex shaped valve that screws into the body. It also uses a copper washer to seal, check it.

mmkay I think I'll go buy a stethoscope and try to find out where it's at before messing with stuff

Watch out for snakes!

I think you owe me a b13 chip for that comment...

It may be your pullies making that noise and you think it is a vacuum hiss.

Rough idle and hiss means a vacuum leak, as you already know. I actually forgot to put one of the iacv bolts in and wondered why my car did the same. Maybe a leak on the itm. Has it always been that way or did you change anything recently?