2000 ALH anti-shutter valve open "all" the time

[dieselherb1]

I have 2000 Jetta, the anti-shutter valve is activated all the time. Tried 3 different valves same thing. Any ideas?

[vanagonturbo]

The anti shudder valve is only closed for a temporary time during engine shut off. After it closes, it opens back up so you can start the engine. Maybe have a buddy help you and watch it during engine shut off and see if it closes and then opens back up.

[dieselherb1]

It closes and stays close as long as there is vacuum. When engine is running if I reconnect the valve it will shut down the engine with the key still on

[vanagonturbo]

It is very likely that you have a faulty vacuum solenoid. IIRC it is the one in the little cavity in the middle of the intake manifold. If you have Vagcom, you can run an output test which will turn the valve on and off every second. You can check for voltage at the plug to the solenoid. If the voltage is fluctuating but when the solenoid is connected its not clicking, then you need a solenoid. I bet 200 internets this is your problem

[BigVWman]

Is it possible the vacuum lines on solenoid are reversed?

[745 turbogreasel]

More often, I find they've fallen or been knocked off.

[vanagonturbo]

Is it possible the vacuum lines on solenoid are reversed?

It doesnt really matter one way or the other since the solenoid is like a gate. Its either open or closed.

[BigVWman]

isn't there three lines( vac in, output and vent) and if vacuum was applied to the vent line instead of where it should be wouldn't that allow the anti shudder to be open all the time and close only momentarily when you shut the car off?

[vanagonturbo]

There are only two vacuum connections on the valve for the anti shutter flap. I think you are thinking of the EGR or charge pressure control solenoids. Those CAN be connected incorrectly and cause wierd stuff, but the anti shutter valve only has two connections.

[BigVWman]

Yep your right I was thinking n75 n18 type stuff! Sorry for the confusion!