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  #1  
Old 08-12-2007, 03:04 PM
svxstarship svxstarship is offline
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Vacuum hose connection or not??

Removed the intake manifold to replace all the dried out hoses etc. Before starting I noticed the pipe off the back of the passenger side manifold had nothing connected to it. Does a vacuum hose connect to this pipe ( see pic ),
or not? ps, the rubber hose above it in the pic connects to the fuel rail so it's not that. This is on my 92. Checked on my 96 but the pipe is not there.
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Old 08-12-2007, 07:01 PM
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They look small to me to be a vacuum hose. The curved hose in the center far right is a vacuum hose.
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Old 08-12-2007, 08:35 PM
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I mean the metal pipe, the one that is dead center in the middle of the pic. Does any hose connect to it?
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Old 08-12-2007, 09:11 PM
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You meant he one with the thin red outline in the picture right? I think I found that in my car. It has a cap and a square-topped screw in the, no lines to anywhere. I took a picture of it, the camera is underneath the corrugated part of the air intake looking forward. The thing has a red circle around it.

I'm sure one of the experts will chime in to tell us what it's for eventually, because I have no idea.
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Old 08-12-2007, 09:50 PM
svxstarship svxstarship is offline
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Thanks for the pic. I think that is the same part I'm talking about. A little hard to tell from the pic. The pipe is pointing toward the rear of the car, right?
Yours has a cap on it? Mine does not. Do you have any idling issues?
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Old 08-12-2007, 09:59 PM
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It's attached to the back of the intake dealy between the manifold and the engine block and yes, it points up and back. I have no idling issues with my car, but I do have an annoying hesitation on acceleration around 1500 RPM, which I'm attributing to the TPS right now.

If that thing is open on your car it would be allowing air to be drawn in which isn't being recognised by the MAF, so you'd be running leaner than you should be. That hole is too small to allow much air through, so at high RPM there would be little difference, but at idle there might be enough airflow through there to screw up you air/fuel mix to the point it makes you car run poorly.
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92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping
2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos
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Old 08-12-2007, 10:06 PM
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Cha-Ching! I know what it's for (pretty sure anyway).

The drivers side has the same part (I'll call it a nipple), which is connected by vacuum hose to the brake master cylinder. I guess it provides a vaccum source for the brakes. The one we've been talking about on the pass. side could be the vaccum hose source for the JDM right hand drive cars, which have the master cylinder on the opposite side from out cars. I'm betting by the time Subaru built your 96 there was either a different vacuum source or they had just stopped putting a nipple on the passenger side intake on the left hand drive cars.
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92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping
2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos
2008 Subaru Legacy Spec B - Diamond Grey Metallic - Sold
2020 Ram 1500 Longhorn - Red Pearl


Last edited by Crazy_pilot; 08-12-2007 at 10:08 PM.
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