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What is that hose about?

 
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Old May 13, 2003 | 04:57 PM
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LGTBaller
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What is that hose about?
Ok so you know where your MAF is right? Well right behind it there is a hose that runs from the bottom of the intake tubing into the manifold....what does it do?
Old May 13, 2003 | 06:06 PM
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mafiaryan
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probally just a vaccume line
Old May 13, 2003 | 07:46 PM
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ZIZZIZ
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i have no idea what it is, but i once was looking at my filter and accidentally disconnected. th engine wouldn't start and it took me 15 minutes to realize it had fallen off. it was bizarre and pissed me right off.
Old May 13, 2003 | 09:18 PM
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FW Motorsports
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How large in diameter is said hose?
If it's about 5/8", it is one of the PCV hoses, and as you found out, if loose, the engine has one big vacuum leak.
Old May 14, 2003 | 11:35 AM
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LGTBaller
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Ok there is only one hose that leads off of the bottom of the tubing directly behind the MAF. I had the same problem you mentioned earlier when I did and induct service to my car. So I would gues it is probably 5/8 in diameter....i thought it might be a oil thing, but then why would it lead to the side of the mani? why do they need to put a vaccum hose right there? what purpose does it serve?
Old May 14, 2003 | 12:42 PM
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The_Lizard
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I've disconnected that one, too - once
As described, the engine acted like it had a huge vacuum leak.
Old May 14, 2003 | 12:55 PM
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It's part of the PCV system as stated.

Old May 14, 2003 | 12:57 PM
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LGTBaller
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what year is that chart for it looks like there is an extra hose then what i have on my 1997.
Old May 14, 2003 | 02:11 PM
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Car Info: 19' Impreza Sport Manual / 99 Miata / 13' OB
It's more of a generic Subaru chart but the principle is still valid. On my RS one of the hoses goes to the second air box.
Old May 14, 2003 | 02:27 PM
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LGTBaller
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does anyone know if it is safe to by-pass this hose by plugging the tube and putting a breather filter where the hose is? Or maybe just plugs?
Old May 14, 2003 | 05:07 PM
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Maybe the question was about the hose for the idle air control valve?
Old May 15, 2003 | 11:26 AM
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LGTBaller
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oh man make it mor confusing! I am pretty sure from the diagram it is the PCV....that's it how about I take a pic so we all know what I am looking at...I will post it up tonight...may not get it right but I'll try.
Old May 15, 2003 | 07:43 PM
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mysubaruimp
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not sure, but i think you can leave the hose off. it is definatly safe short term, not sure about the long term affects, if i dont get off my lazy *** and get to autozone to buy vacumn tube, i will be able to tell you the long term affects, if any
Old May 15, 2003 | 09:03 PM
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Peaty
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Car Info: 19' Impreza Sport Manual / 99 Miata / 13' OB
You'll have to plug the hole in the intake and put a small breather filter on the hose or you'll pull in dirty air to the motor.

Like one of these:

Old May 15, 2003 | 11:14 PM
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IAC hose does not appear on the PCV diagram.
Originally posted by LGTBaller
oh man make it mor confusing! I am pretty sure from the diagram it is the PCV....that's it how about I take a pic so we all know what I am looking at...I will post it up tonight...may not get it right but I'll try.
 
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