03 a4 1.8t vaccum problems... maybe a valve?

Got an 03 A4 1.8t. Lightly chipped and no other modifications.
Heres the issue. Under acceleration I can hear a hiss from the engine compartment. No noticeable change in performance but sometimes when I
come to an idle, its rough and I can hear a little hiss. I get out.. pop the hood and identify the source of the his... and give it a thump. The valve snaps itself together, the hiss goes away and the idle returns to normal. What valve is this? Does it normally snap apart like its doing? If I removed it from its assembly I believe it would just fall apart. Is that normal?
http://jake.rakestraw.com/images/engine.jpg
This is a shot of the engine compartment with the questionable valves location circled.
http://jake.rakestraw.com/images/valve.jpg
This is the actual valve. You can see the dust free fingerpriunt on the side when Ive been pushing on it to pop it back into place.
Any ideas?
Jake
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Apr 9, 1:17 pm, snipped-for-privacy@rakestraw.com wrote:

Its not normal. i'm forgetting the name for it and its proper function, but its part of the vacuum line and its linked to the brake system. Apparently its a pretty common problem with Audi. I just taped the split together (where it keeps popping out from) and drove my car for about a month until I got a chance to change it. Easy fix, took about 30 minutes in all, part cost less than $50
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Ok... I took the valve out. Its a suction pump. part #058 133 753 b.
Why would the end pop off of it like this? Is this a sign of some other problem in the vacuum system? The valve (or pump, as its called) didnt fail or clog, that I can find. It just seperated into two pieces. Being held together by the tension of the hoses that it uses to function.
here is the whole pump....
http://jake.rakestraw.com/images/whole.jpg
and here it is with the valve assembly snapped apart
http://jake.rakestraw.com/images/broke.jpg
Is the popping apart of the pump a safety measure to keep something else more vital from exploding?
Jake
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Apr 10, 3:47 pm, snipped-for-privacy@rakestraw.com wrote:

the part is called a suction jet pump not sure what it do yet but i have the same problem it's only $33 at audi i have one on order
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.