what is it 022 131 519 - what does it do found on a 75 auto

[vw76westy]

when i bought this bus this valve was installed

now that i have torn down the engine

i can take better pics of this valve & ask what its for

at first i thought it was previous owner add-on
but it cant be

everything else on this engine looked virgin when i first
started replacing fuel lines,etc.....

the engine tin has a factory hole for a hose that runs from the valve to
a T that connects to brake vacumm line (the T also looks like a factory connection)
the other side of valve connects to plenum

the valve goes in that spot where you would otherwise have
the eng tin bolt that is mysteriously oversized (and now i know why)it
it has vw part # 022 131 519

but i cant find any info in the...
bently,in the FI troulble shooting guide, or anywhere


again this is on a 75 with a rare 75 only automatic only FI system

and i say rare because the bently has no info for this specic fi system
ratwell has no info on this fi system & to this day no one has come up
with a authentic diagram of how the vacumm lines should look like
or any documented info on what this system should have & look like


here are the pics........

T to brake vacumm

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quote from bay window bus buyers guide........
The Type 4 engine is considered by many to be VW's finest air-cooled motor,

[Wildthings]

Mid seventies engines of all makes have many weird vacuum valves on them. It is hard to figure out exactly what they all did. I would guess that this one either opened or closed as the engine came up to temperature. There is certainly no guaranty that it is plumbed correctly anymore.

[Westfabulous]

Did the bus have cruise control by any chance? My bus has the VWOA cruise and has the same tee in the brake booster line. It uses vacuum from the brake booster for the cruise system on my auto bus. Just a thought.
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"I will gladly pay you Tuesday for a hamburger today."

[old DKP driver]

It's the EGR temp switch (valve). vacuum from the hose attached to the small barb (in your pic) to the EGR valve switch then to the EGR valve
It's closed below 12*C (54 degrees F.
_________________
V.W.owner since 1967

[Westfabulous]

Nicely done!
_________________
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"I will gladly pay you Tuesday for a hamburger today."

[SGKent]

[vw76westy]

[busdaddy]

Yes it is, those shmartypants Germans used the booster as a vacuum reservoir (who needs extra parts?) so when you've got the throttle mashed (time when EGR has to come on) there's still lots of vacuum to lift the valve fully.
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[vw76westy]

is it a direct & closed connection to the egr

or is it T'd in with a vacumm line coming from the plenum or something





the valve releases vacumm to open the egr "all the way"
threw the brake booster vacumm
but only when its hot

when its cold the valve stays in a closed position cutting of vacumm
& thus preventing the egr from opening completly

correct ???
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quote from bay window bus buyers guide........
The Type 4 engine is considered by many to be VW's finest air-cooled motor,

[busdaddy]

Not connected to the plenum or anything else just the EGR system, and yes you are correct that the thermo valve prevents the EGR from operating below a certain engine temperature.
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[vw76westy]

ok great
thanks everyone,

so if i have the egr capped off & im not using it
then i can also cap off the the line at the T (or even remove the T)
remove the valve & store it

right....

and since we are on the subject of the egr

on the 75 egr there is a connector on it coming from the fi harness



what exactly is it doing....
powering something inside ?
reading air levels ?

i mean if vacumm is whats opening & closing it
then what are the 2 wires conected to it do....
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quote from bay window bus buyers guide........
The Type 4 engine is considered by many to be VW's finest air-cooled motor,

[busdaddy]

The wires are what activates it (on early systems like yours), the thermo valve disables it when cold by cutting off the vacuum supply.

Cap it at the plenum and exhaust and remove the Tee if you can (less places for potential vacuum leaks).
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[pgtips]

if it is of any help to you I have the same model bus, plumbed up. rebuilt the engine and due to fire him up in the next few weeks but mine is complete and back to as it should be.

There, now I've just put the kiss of death on it !!

PG

[vw76westy]

Instead of started a new thread ill just continue with this one

Again the question is what is it called & whats it for……..
bottom right in pic

This is another 75 only, automatic only part that is not described in the bentley



For a while now
When I start the bus everything seems fine
Unless you put it drive before its warmed up
It will stall out & feel like its out of gas
After that.. I go full throttle when starting & keep it there
The bus will start but….it feels like it going to die
and it will if i let go of the gas

The other day I decided to back off the bolt pushing on the throttle
& try readjusting...... after that, the bus would not die but it would not
Go either, it just felt like it was about to run out of gas

So now I have been playing with the adjustment “blindly”
And thought that I had things figured out

I notice that vacuum pulls it closed & that a lack of vacuum
Will allow it to open all the way(disconnecting vacuum line)

Anyways this morning when it would not start
I disconnected the vacuum & it started right up
(did not plug vacuum line) then connected vacuum line
Back on

The bus runs like crap & is unreliable right now
& im willing to bet that it has to do with this part
controlling the amount of vacuum in my fi system


this part might be rare on a fi bus but seems pretty common
on other fi vw's
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quote from bay window bus buyers guide........
The Type 4 engine is considered by many to be VW's finest air-cooled motor,

[raygreenwood]

That part in the picture is the throttle positioner. It is designed to keep the rpm from dropping enough to stall the car as you come to a stop at a light. This happens because it may take a second or so for the torque converter to fully decouple and unload the engine.

But....I thought that part was generally a 411/412 part. I never knew it came on busses. Ray

[vw76westy]

"throttle positioner"

makes sense i disconnected completly & capped it off to see what would happen & thats what happened during a test drive

[busdaddy]

The positioner is only part of the system, now you have to find the gizmo that controls it, followed the hoses to see where they lead?
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[vw76westy]

[pgtips]

I've got a 75 auto, 2.0L, up and running after rebuild, just put 450 miles on it so working ok.

Got some unravelling of double relay connections (which will be another post in a while) but for now I can give you pics, info, whatver you need from a working 75.

Did you replace temp sensor II, that can make it run like sh!t, die, start again etc. I'd do it anyway, cheap simple job. Needs a long 13mm socket btw.

I came across the T under the car to brake booster during rebuild as well, Main big pipe goes to brake booster and other bit (the T) goes to EGR. My EGR not connected (re Ratwell, just unplugged as most of the EGR specific bits aren't there anyway) so ran it (the pipe) straight through.

One of my older posts replied to by BD "The larger line is to the brake booster, you'll want to replace that, looks pretty crusty. The smaller line Tee'd into it was for the EGR valve."
and he was right,

http://www.thesamba.com/vw/forum/viewtopic.php?t=443411

Glad I did check, my brake booster new pipe isn't man enough to handle the vacuum and has compressed so new one of those this week.

In my engine I cannot see that piece that screws in and i have checked some of my pre and post engine rebuild pics and it isn't there.

maybe a hole for it under the ATF red label but it wasn't there when I rebuilt, I am fairly sure of that.

Got pics of the engine before and after as complete setup, I know what most of it does thanks to the forums.

Also poss worth replacing your HT leads and plugs. (new again). Its a good thing to do and won't hurt, if there is a breakdown there, if they are old, it won't run right.

PG

[1975 Kombi]