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#1
09-05-2005, 08:37 AM
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Recommended maintenance: Replace vacuum hoses at 100K miles
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I decided to pull of the intake manifold to make it easier to replace the PCV valve and knock sensors, and so I decided to do all vacuum hoses too. Glad I decided to go that way. Virtually every hose had hardened to the point of being almost non-flexible. I suspect that many of the hoses would have started leaking vacuum within the next 20k-30k miles. .
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads. Last edited by svxcess; 03-20-2019 at 01:16 PM. 
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#2
09-05-2005, 10:01 AM
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Gee, I will have to go out and check mine.
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. Earl .... ... .... ><SVX(*> Subaru Ambassador [COLOR=”silver”]1992 Tri Color L[/COLOR] ~45K (06/91) #2430 1992 Dark Teal LS-L ~184K (05/91) #0739 1992 Claret LS-L ~196K (05/91) #0831 1992 Pearl LS-L ~103K (06/91) #1680 1992 Pearl LS-L ~151K (06/91) #2229 1992 Dark Teal LS ~150K (07/91) #3098 (parts car) 1992 White LS-L ~139K (08/92) #6913 1993 25th AE ~98K (02/93) #164 1993 25th AE ~58K (02/93) #176 1993 25th AE ~107K (02/93) #215 1993 25th AE ~162K (02/93) #223 1994 Laguna Blue Pearl LSi ~124K (1/94) #2408 1994 Laguna Blue Pearl LSi ~144K (10/93) #1484 1994 Laguna Blue Pearl LSi ~68K (10/93) #1525 1994 Barcelona Red LSi ~46K (02/94) #2624 1994 Pearl LSi ~41K (12/93) #1961 1995 Bordeaux Pearl LSi ~70K (02/95) #855 1996 Polo Green LSi ~95K (03/96) #872 1997 Bordeaux Pearl LSi ~55K (08/96) #097 2003 Brilliant Red LS1 Convertible ~29K (04/03) #8951 1999 Magnetic Red LS1 Coupe ~33K (04/99) #6420 My Email | Old Locker | New Locker | Picture of 15 of the 19
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#3
09-05-2005, 10:06 AM
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How many can be replaced with standard hose and how many need to be the OEM pre-bent hoses?
Doug
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1992 LS Touring (6/91) - Currently undergoing a five speed swap Black over Claret with spoiler; 235,000 miles; Mods: 2002 Legacy 5 speed, ACT Pressure Plate, Excedy Clutch, Short Throw Shifter, Aussie Powerchip 1992 LS Touring (6/91) Black over Claret with 2.5" setback spoiler; 202,000 miles; Mods: B&M Cooler 1994 LSi (4/93) Bordeaux Pearl; 198,000 miles; Mods: Weight reduction. 1969 Mustang GT Convertible 1970 Mustang Convertible 2000 Ford Excursion Sola lingua bona est lingua mortua. My Locker
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#4
09-05-2005, 11:05 AM
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I think that all of the vacuum hoses could be replaced with straight hose, but it would be necessary to get high quality hose that's got the proper metric ID. I tried some 1/8" vacuum line I picked up at Schuck's, and the ID was too big for a good seal. I'd probably go with viton hose which has a greater heat range than standard nitrile rubber and can withstand gasoline fumes (unlike silicone hose).
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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#5
09-05-2005, 11:13 AM
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I don't have to go under my hood to know most of my hoes are hard as rocks.
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. 
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#6
09-05-2005, 04:59 PM
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I replaced all mine a while ago with just bulk straight hose. You don't need the pre bent hose as long as you can remember which hose hooks to what terminal.
Almost all of mine were dry and brittle. I'm sure I was losing vacuum with the condition they were in.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P.
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#7
09-05-2005, 07:07 PM
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Quote:
Gee, what a surprise that the lines were rock hard   Can you post your source for viton hose when you find it? Thanks. -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker
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#8
09-05-2005, 09:49 PM
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Quote:
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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#9
09-05-2005, 09:52 PM
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Quote:
http://www.subaru-svx.net/photos/fil...czko/29136.pdf
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads. Last edited by mbtoloczko; 09-05-2005 at 10:40 PM.
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#10
10-16-2005, 09:52 PM
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Quote:
Mychailo, Well, the viton is here and ready to go. Looking at the valves that came with my "spare" intake, two of them have snapped off hose connectors  Can you confirm that I've got the following part numbers right: Thanks in advance for your help on this! -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker Last edited by SVXRide; 10-16-2005 at 10:03 PM.
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#11
10-17-2005, 08:30 AM
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Hi Bill,
Those part numbers look correct to me except that 14474AA271 looks like it should be 14471AA391 (updated). 16102AA020 is the solenoid that I broke and had to replace. If you're mail ordering, Jason at Auburn Subaru (WA) has the best prices. 866 528-5282.
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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#12
10-17-2005, 08:33 AM
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BTW, if anyone is interested in tackling this, I wrote a how-to on it. Its in the how-to locker:
http://www.subaru-svx.net/photos/files/How-To/30340.pdf
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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#13
04-07-2015, 02:57 PM
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Re: recommended maintenance: replace vacuum hoses at 100K miles
Old thread revival...
I ordered some Viton hosing from McMaster but I want to make sure that the hose I received is indeed the 60 "firm" and not 70 "soft" variety. What had happened was I placed the order and accidentally ordered the soft hose. I immediately messaged customer service and asked to switch the type, they responded quickly that they did but I received my hose and I am not sure what I got. The packing slip still says soft so that's why I am concerned.
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1994 SVX LSi JDM Tailbar and Grill, Clear Corners, 15min-mod, Nevin Blue RSB, G-FORCE SPORT COMP-2 Tires, Phenolic Spacers (Manifold & Throttle Body), SS Brake Lines, Maniac Electric Motors 160A Alternator 2008 Legacy 3.0R Last edited by theflystyle; 04-07-2015 at 02:59 PM.
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#14
04-08-2015, 05:08 AM
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Re: recommended maintenance: replace vacuum hoses at 100K miles
For any future searches, the firm hose feels more like a pencil eraser and the soft hose is more like a rubber band.
I also found out that the majority of the vacuum hoses I ordered from Subaru were on national backorder...
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1994 SVX LSi JDM Tailbar and Grill, Clear Corners, 15min-mod, Nevin Blue RSB, G-FORCE SPORT COMP-2 Tires, Phenolic Spacers (Manifold & Throttle Body), SS Brake Lines, Maniac Electric Motors 160A Alternator 2008 Legacy 3.0R Last edited by theflystyle; 04-08-2015 at 05:10 AM.
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#15
02-19-2017, 09:18 AM
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Re: recommended maintenance: replace vacuum hoses at 100K miles
Big thanks to mbtoloczko for writing this up years ago. I tackled this project over the weekend. My 92 with 160k desperately needed replacing of all vacuum lines, hoses, pcv and knock sensors (both were cracked).
The longest part was actually getting the parts. Some hoses were on back order and took longer than expected to ship. However the following hoses are no longer available: 807607992 (throttle body water hose #1); 807412162 (aux air hose #2; 807503900 (small vacuum hose upper rear throttle body #1); 807504442 (vacuum hose into small black box) and 807520162 (idle air control hose). Each had hardened to the point they could be broken in half. As careful as I was i managed to break the vacuum box and both solenoids under the intake manifold. The hoses essentially bonded to the plastic and the slightest torque applied simply snapped the plastic valve. Fortunately I had a spare intake manifold and was able to safely remove the hoses from those solenoids. I used a dremel and carefully cut the rubber to help speed up the process. If the SVX is your daily driving or if you need it the next day, definitely consider purchasing the solenoids beforehand. Due to the limited availability and delays in shipping, if you break a part you may be svxless for at least a week. One note is that I had to remove the alternator and loosen the a/c compressor to allow enough clearance to remove the driver's side intake manifold with the fuel lines. Btw, what's the secret to uploading pics to this site? Each time I try, my upload "fails". Thanks again for a great write up and taking the time to include all the part numbers, descriptions and alternative part sourcing. Last edited by SVXMAN2001; 02-19-2017 at 09:21 AM.
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