VVIS Functioning Correctly?

Volvoguy83 · Post by **Volvoguy83** » 28 Dec 2012, 10:25

Hello,

After doing some routine maintence I noticed that my air pump solenoid valve looks pretty beat up. Im not sure if it is the original valve but it has been on my car since i have owned it 110,000 miles and 13 years. I disconnected it from the air box and disconnected both rubber elbows and heard a hiss coming from it, which as i understand it means it is functioning correctly. All the elbows appear to be in good shape with no cracks or rot.
I dont know if a non functioning solenoid valve, servo or the control vavle would throw a code, but I know I have no codes that correspond to that. Im wondering if any of those 3 components that control the VVIS are wear and tear items that I should consider replacing...

Post by **cn90** » 28 Dec 2012, 10:31

Search forum for SAS Delete.

Post by **jblackburn** » 28 Dec 2012, 11:11

SAS has nothing to do with the VVIS system.

As I understand, the VVIS system usually does not throw a code, but you will feel a "shift" in power around 4,100 RPM. Kinda like a less-aggressive VTEC in a Honda, if you've ever driven one.

Find the hose that attaches to the elbow to the actuator under the intake manifold and suck on it/pull a vacuum to see if there are leaks in the hose or if the valve will actuate. Attaching it directly to a port on the throttle body intake tree may get you that effect.

Volvoguy83 · Post by **Volvoguy83** » 28 Dec 2012, 14:36

Thanks J,

By my understanding, thats what I though the VVIS should be somewhat like. My other car is actually an 06 civic Si so I know what Vtec feels like. Ill check out the vacuum on the actuator because above 4100 I really dont see much of any difference, if anything it almost feels a bit weaker on the top end.

Post by **Ben850** » 28 Dec 2012, 16:58

The solenoid on the airbox is an all plastic casing. It is the metal bracket that corrodes on every one that I have seen. The same type solenoid is also used in the EGR/SAS systems.
I haven't heard of an actual malfunction with any of the VVIS pieces, although I could imagine the vanes in the manifold becoming sticky. I sprayed a good amount of throttle body cleaner into the manifold when I had it off for the PCV system maintanance.
I also went a step further and installed a switch to activate the solenoid. There is an extensive thread about that in the performance forum. Also search VVIS Mod. The guy makes these switches by hand and ships from Amsterdam.
I'll add links when I find them.
Oh, and the hiss that came out when unhooking the solenoid, lets you know the check valve is saving vacuum in the vacuum tank in the fender. So yes, that would be a good thing.

Link: https://www.matthewsvolvosite.com/forums ... =5&t=24681