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EA81 / Hitachi vac hoses
Posted 28 November 2010 - 08:18 PM
For starters, what is this thing? What is it called? It is a plastic canister of some sort. It has two hose coming from it. One connects to the rear of the carb. The other.....???
When pulled away, I find this hose, that isnt connected to anything...
The car seems to be running great.....
But Id like to find this hose a home!
Any help is greatly appreciated!
Posted 06 December 2010 - 07:09 PM
But the previous owner did have the motor out for headgaskets. So things might have gotten mixed up a bit.
As I said though, it runs great.
I just got back from a trip to Seattle. Logged more than 700 miles, and got a bit better than 27mpg
I just need to find a home for this hose!
Posted 06 December 2010 - 07:30 PM
Where exactly does the connected hose connect?
Posted 06 December 2010 - 07:34 PM
non-CA, and no O2 that I can find. It does have EGR and and a charcoal canister though.
The hose that is connected connects to a port on the top rear of the carb. The port it pointed straight to the drivers side fender, it is tucked up near the aircleaner.
Here you go....
Thanks for any help!
Edited by Idasho, 06 December 2010 - 07:38 PM.
Posted 06 December 2010 - 10:35 PM
The other end of the line should tee into "thermovalve IV" which is mounted on an insulator on the intake just to the drivers side of the carb.
It should tee into a line from the "air control vacuum valve" before attaching to the themovalve.
The air control vacuum valve is similar w/4 ports.
Posted 06 December 2010 - 10:49 PM
Now, the other day I took a long look at the under-hood diagram
And using the preformed bends in the hose that doesnt have a home, I found that it DOES line up with a T-fitting that attaches to that thermovalve. Only problem is that the T-fitting had a cap on it. So I removed the cap, and hooked the hose up. I thought I had things figured out....
Then I started the car. The motor idled a bit rough, and REALLY stumbled when you tried to rev it. So I put it back how it was, and here we are.
So what does this mean? Can these thermovalves go bad? Can they be removed and cleaned? or do they just get replaced?
And for the simple sake of conserving my sanity.... Im going to link to a few threads that may be of use, so I have a means of finding the threads again....
Edited by Idasho, 06 December 2010 - 11:10 PM.
Posted 06 December 2010 - 11:51 PM
It vents the carb bowl to atmosphere thru the self contained air filter on the BVV above 60C.
It also opens calibrated air bleeds in the carb to lean the mixture a little.
Sounds like the BVVV is bad.Probably why it was disconnected.
It should hold vacuum applied to the lower port.(bet it doesn`t)
Since your car runs well,I wouldn`t be too concerned,but, it might be even better w/a junkyard part.
Posted 04 January 2011 - 11:16 PM
Posted 06 January 2011 - 10:44 PM
It looks like you have a CA emissions feedback carb - I think both #2 and #3 are metering ports that should connect to the metering duty solenoids that are mounted to the manifold near the carb..... best guess from memory.
I haven't worked on one in a while - I just unbolt them and drop them directly in the trash compactor...... When I work on carbed Subaru's at all anymore - these days it's mostly about the newer EJ stuff and I dumped all my Hitachi's on my personal rigs years ago.
Posted 06 January 2011 - 10:56 PM
Posted 06 January 2011 - 11:04 PM
When I stripped the carbs of all that stuff I just plugged the metering ports off. They seemed to run best this way vs. open or given constant vacuum. Which isn't saying much because there was always problems without the proper metering signals. The carb just wasn't designed to not have that stuff.
Posted 06 January 2011 - 11:45 PM
Posted 03 July 2011 - 07:56 PM
The black device is called the air control vaccum valve. The loose end you are referring to connects to one of the ports on the air filter housing.
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