Subarule Posted February 12, 2008 Share Posted February 12, 2008 When I had my car in the shop some months ago I asked them to check for vacuum leaks. They found that my _____ is cracked. What the heck is it/what is it called? What does it do? How do I look for a replacement, by part name or part #? How do I get a part #? It's the black plastic thingie with "Hitachi" embossed on it. The shop told me it has 5 outlets for hose connects. http://i45.photobucket.com/albums/f69/justactnormal/AirControlVacuumValve3.jpg More views: http://i45.photobucket.com/albums/f69/justactnormal/AirControlVacuumValveSituated2.jpg http://i45.photobucket.com/albums/f69/justactnormal/AirControlVacuumValveOverview2.jpg http://i45.photobucket.com/albums/f69/justactnormal/AirControlVacuumValveOverview3.jpg Your help appreciated. Subarule Link to comment Share on other sites More sharing options...
GeneralDisorder Posted February 12, 2008 Share Posted February 12, 2008 Looks like some sort of valve to allow vacuum to draw in vapor from the charcoal canister - like a fresh air vent that only opens when the engine is running. Probably operates of a thermo-vac valve or the like. Junk it and cap the lines. You don't need it. P.S. not much of a shop if they can't figure out what it does. It's a simple matter of tracing the lines, putting some vacuum and pressure to it and seeing what happens. They could have at least figured out what it was for. Some people just shouldn't wrench at all GD Link to comment Share on other sites More sharing options...
Gloyale Posted February 12, 2008 Share Posted February 12, 2008 The title of you're pictures has the name in it. It's the Air Control Vacuum Valve. What does it do?? ........Crack and make you're car idle crappy. Ditch it. It will help you're idle. Link to comment Share on other sites More sharing options...
pheonix165 Posted February 12, 2008 Share Posted February 12, 2008 like they said. ditch it, ya wont miss it. on the bright side, keep in mind its been a while, i don't think the FI cars even have it. i had an 86 wgn a while ago, same thing was cracked. didn't even notice it was gone. Link to comment Share on other sites More sharing options...
Subarule Posted February 12, 2008 Author Share Posted February 12, 2008 The title of you're pictures has the name in it. It's the Air Control Vacuum Valve. What does it do?? ........Crack and make you're car idle crappy. Ditch it. It will help you're idle. I had to give it some sort of name and the shop got various names for it when they called around and tried to find a replacement for it. I think that's the name the local Subaru parts dept. gave it, but they didn't have one and couldn't order one from Fuji as they're considered an obsolete part. Subarule Link to comment Share on other sites More sharing options...
Subarule Posted February 12, 2008 Author Share Posted February 12, 2008 Looks like some sort of valve to allow vacuum to draw in vapor from the charcoal canister - like a fresh air vent that only opens when the engine is running. Probably operates of a thermo-vac valve or the like. Well, I knew it controlled vacuum, I was wanting to know, vacuum to what? It has five ports and hoses connected to it so it's running more than a single module, I would think. Junk it and cap the lines. You don't need it. What about the 5 lines going to I-don't-know-where-all...I don't need any of them? P.S. not much of a shop if they can't figure out what it does. They knew it controlled vacuum. I didn't talk to the mechanic, I talked to the gals that run the place, they know quite a bit, they've been there forever and are the owner's daughters. They just didn't know specifically what all the lines going to it went to. They don't work on many Subarus that old. Mine is probably the only one. I know they think I'm eccentric for keeping it going and having it as my only vehicle. It's a simple matter of tracing the lines, putting some vacuum and pressure to it and seeing what happens. They could have at least figured out what it was for. Some people just shouldn't wrench at all GD Oh, I'm pretty sure the mechanics did. I just didn't talk to them, they were swamped like they always are. I figured my little cracked 26-year-old plastic thingie was very small potatoes compared to what other work they had going on. I know the gals that run the place spent a lot of time over the course of several days trying to track down a replacement. So, where do I get a replacement part? Or is that a million-to one-shot? And what all do those five ports support? Subarule Link to comment Share on other sites More sharing options...
Skip Posted February 12, 2008 Share Posted February 12, 2008 From the diagram provided by Gloyale doctored somewhat by me. The ACVV controls the air flow through the emultion tubes in the carb. It is controled, as GD says, by a vacuum signal (lower line on the ACVV) which is controled by the thermo switch/solenoid valve. The top line beside the plugged port goes to the inside of the air cleaner. From the diagram, it looks like you could connect the two lines going to the carb together and plug the rest. Maybe with this diagram your shop would have a better understanding. Hope this helps Link to comment Share on other sites More sharing options...
Subarule Posted February 12, 2008 Author Share Posted February 12, 2008 From the diagram provided by Gloyaledoctored somewhat by me. The ACVV controls the air flow through the emultion tubes in the carb. It is controled, as GD says, by a vacuum signal (lower line on the ACVV) which is controled by the thermo switch/solenoid valve. The top line beside the plugged port goes to the inside of the air cleaner. From the diagram, it looks like you could connect the two lines going to the carb together and plug the rest. Maybe with this diagram your shop would have a better understanding. Hope this helps Thank you very much! I will print this out. Now, where do I get an intact ACVV? :-\ Subarule Link to comment Share on other sites More sharing options...
Skip Posted February 12, 2008 Share Posted February 12, 2008 You're most welcome, If you plan on keeping it in your system you could start by putting a "Wanted" ad in the "Subaru Wanted forum" http://www.ultimatesubaru.org/forum/forumdisplay.php?s=&daysprune=&f=37 Link to comment Share on other sites More sharing options...
GeneralDisorder Posted February 13, 2008 Share Posted February 13, 2008 Junk yard, but most likely even if you find one that isn't cracked it still won't operate correctly. You will have to dissasemble it to see exactly how it works and come up with a suitable replacement that performs the same function. I would guess that it's designed to open the emulsion tube vents(?) to a filtered air supply when the engine reaches a specific operating temperature. You could do the same thing with a few regular vacuum valves by T'ing them together in the neccesary orientation. But really this is all acedeminc. You aren't going to notice a bit of difference doing all this work vs. just leaving the thing out, and leaving the emulsion tube vents open to the filtered air supply line. At least Skip's scan gives you an idea what to block and what to route to filtered air. You have to stop thinking like you are - you have a burning desire to replace this silly plastic peice because you have no faith in your own abilities to figure out what it's purpose is, decide if it's right for YOU, and then either eliminate it or find a suitable alternative. It's depressing to see such narrow-mindedness. Go forth and be inventive. Just because it came that way doesn't mean it has to be put back to "stock". Find you own "stock". GD Link to comment Share on other sites More sharing options...
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