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Discussion Starter · #1 · (Edited)
I've got a question What is this and what does it do? And is it on every car or certian models?;oops: Let me clarify the photo. It is the Silver peice under the hose.

 

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Is your arrow pointing at the black plastic pipe? :confused: I can't tell for sure. If yes, it is the delivery pipe; running from the Intercooler down at the front end up to the throttle body. It is where air comes into your engine after getting pressurized.
 

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Presto said:
He was referring to the silver gizmo under the delivery pipe. It may be a Viggen part it is not on my 9-3.
Aah I got it; not sure what it is though, sorry. That picture is a 2.0 engine, not a 2.3L Viggen; But my car doesn't have that part on it either. Perhaps this picture is an autobox and that is something to do with the auto?
 

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Some models have a vacuum pump driven by the exhaust cam. It is used to create vacuum for the brake servo.

The pump is attached the same way as the distributor shaft on the '94-98 2.3L non-turbo. Sort-of cool idea, I think.
 

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Funny that some models would have this vacuum pump, but not others. I think some Aussie models have this pump as well..

It would be nice if this was a vacuum/pressure pump with an attachable hose long enough to reach the spare tire...
 

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Yes, that's a vacuum pump for the brake.

Unlike NA engine, turbo charged engine does not produce vacuum in the intake manifold during boost so you need to create vacuum artificially. That way when you do brake the diaphram in the servo is ready to assist.
 
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