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Discussion Starter #1
on the intake plenum, there is a tube, which connects to a small box, and then from the little box to the intake tube.

the little box is empty, so what's it for? moreover, what is that whole tube for, it's not PCV is it? that's the second hose on the intake tube, that connects to the head cover.
 

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My guess is that it's a resonance chamber to prevent noise from the IAC valve. It's a computer controlled solenoid that allows the appropriate amount of air into the engine with the throttle closed, e.g. at idle.
 

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The tube coming off the valve cover is PCV
I think you're talking about a different tube than BigJohnny is - he's talking about the rubber hose that plugs into the IAC motor, connects to a black plastic box and then makes a 90 degree bend where it then connects to the air intake tube. That black plastic box is located directly behind the alternator.

If I understand him correctly.

Dennis
 

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theterminator93 got it. It's essentially a muffler for the IAC to prevent noise from getting out of the intake. Obviously, the hoses are to provide air to the engine with the throttle closed.
 

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I don't know exactly what it is, but when my freind disconnected his on his 2002 Mustang, and then plugged the holes, it ran for crap! He says it is to keep the rpm up between shifts, but I beg to differ. All I am saying is that it made the engine run terribly when it was plugged.
 

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I don't know exactly what it is, but when my freind disconnected his on his 2002 Mustang, and then plugged the holes, it ran for crap! He says it is to keep the rpm up between shifts, but I beg to differ. All I am saying is that it made the engine run terribly when it was plugged.
It shouldn't be plugged!!! This supplies the engine air at idle.
 

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I think you're talking about a different tube than BigJohnny is - he's talking about the rubber hose that plugs into the IAC motor, connects to a black plastic box and then makes a 90 degree bend where it then connects to the air intake tube. That black plastic box is located directly behind the alternator.

If I understand him correctly.

Dennis
on the intake plenum, there is a tube, which connects to a small box, and then from the little box to the intake tube.

the little box is empty, so what's it for? moreover, what is that whole tube for, it's not PCV is it? that's the second hose on the intake tube, that connects to the head cover.
...
 

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Now, would the engine sound any different if there was just a hose connected from the IAC to the intake tube with out the black box?
 

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My only guess would be that there might be a bit of a whine/whistle audible at certain RPM ranges.
 

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Discussion Starter #11
yes thats the box I'm talking about, but I couldn't imagine it being loud without it.

I removed my airflow silencer from my airbox..... it was only yesterday that I actually heard anything from the sound of my intake, and it was in a small VERY VERY VERY quite neighborhood, and was a barely audible noise that I figured was my intake.....sounds really cool, but the silencer is obviously pointless.
 

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It shouldn't be plugged!!! This supplies the engine air at idle.
Like I said, I had nothing to do with it. :D Just what happened to him and I was sharing the experience so no one would make that bad of a judgement again.
 
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