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Vacuum Switching Valve

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3K views 7 replies 3 participants last post by  IsuzuGeek  
#1 ·
Hey, do any of you know what these things do specifically? I know they regulate vacuum pulses, but....

So, I lost the "hat" on one of my vacuum switching valves for the Impulse, specifically this one:

Image


Image


What does that little "hat" do? Mine fell off somewhere and I think it is gone.

Thanks -Bart
 
#2 ·
The Book offers the following:
VSV: Controlled by a signal from the ecm, it supplies the vacuum developed in the intake manifold to the following controls:

VSV Canister Purge
VSV Fuel pressure regulator
VSV Air Control
The item highlighted by the three arrows is the canister purge of the canister purge valve. Based on throttle vacuum, it dumps the fuel vapors to the intake.
 
#4 ·
shooter said:
The item highlighted by the three arrows is the canister purge of the canister purge valve. Based on throttle vacuum, it dumps the fuel vapors to the intake.
Actually, there are two vacuum switching valves in this car, and I think the other one is what attaches to the canister purge. I could be wrong but that is how the diagram is set up. The one in question connects to the EGR.

Selador said:
That hat is just an air filter.
OK, that's good, so not very important. I could probably swipe a hat from another car and stick it on there, eh?

Thanks guys,

Bart
 
#5 ·
I see that now. Looking at the diagram, it's pretty obvious as to functionality of the 2 VSVs.