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  #1  
Old 03-10-2011, 10:21 AM
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What do the two tiny little vacuum lines off the throttle body control?

Those two tiny ones that sit on the throttle body runners, with 90 degree bent outlets. I know one controls the EGR, but where does the other go?

My throttle body is being cleaned up in preparation for joining the new manifold I'm making, which includes shaving all unnecessary details. The new manifold won't have an EGR inlet, so the vacuum source is going to be sliced off, plugged, and smoothed down.

I would just go look at my car, but it's under a cover and a foot of snow.
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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
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  #2  
Old 03-10-2011, 10:39 AM
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Re: What do the two tiny little vacuum lines off the throttle body control?

QQ: Would just plugging the line cause the EGR to stop working? Effectively deleting the EGR?

If I get a chance later I'll take a look at one of my spare engines to see where those two lines lead for you.

Also I'm going to go ahead and guess you know how to delete the charcoal canister, right? I already did if you need info.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project

'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album

Last edited by icingdeath88; 03-10-2011 at 10:41 AM.
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  #3  
Old 03-10-2011, 11:48 AM
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Re: What do the two tiny little vacuum lines off the throttle body control?

The problem is I don't know what circumstances trigger the EGR to open. Removing vacuum may lock it open full time, as opposed to closed. Mine will have a small block-off plate on the outlet that normally connects to the manifold.

I'll be ditching the canister but keeping it's vacuum source on the throttle body to pipe into my vacuum manifold, which in turn distributes it to whatever I want. The return line I'll just plug and hide away. I'm also opening up the electrical harness that lives under the intake manifold and re-routing the wires to tuck them away a little better, as well as replacing all the nasty old wire loom with braided sleeving.
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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

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  #4  
Old 03-11-2011, 10:44 PM
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Re: What do the two tiny little vacuum lines off the throttle body control?

Bump for answers? I'm itching to get the cutters out...
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Chris

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

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  #5  
Old 03-13-2011, 07:10 PM
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Re: What do the two tiny little vacuum lines off the throttle body control?

Mitchell On Demand (Or Snap-On Shop Key, same thing) shows that both lines are used for the EGR, so.... *gets tools*

Lines and nubs are now cut off and smoothed down. I'll be making or finding something to press into the holes to plug them permanently.
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Chris

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

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  #6  
Old 03-13-2011, 10:09 PM
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icingdeath88 icingdeath88 is offline
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Re: What do the two tiny little vacuum lines off the throttle body control?

Followed the lines this afternoon and it looked to me like they were both for EGR as well. One of them leads to an electrical thingy under the plenum first, one goes straight to the EGR thingy.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project

'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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