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My PSE is stuck in loud mode. 🙂 While this isn’t a bad problem, I would like to be able to make it quiet for calls etc. I pulled off the vacuum line before the changeover and can’t perceive any vacuum at idle. I’ve also checked at the input to the switchover for the airbox resonator. Same no perceivable vacuum. I assume this isn't that normal?

 

Where does the vacuum come from? The vacuum pipe seems to head to the front of the car rather than to the vacuum pipe on the engine?

 

 

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Edited by dammad

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Anyone any ideas? Wanted to try to fix it today (US holiday - Veteran's day). I can't find a diagram of the vacuum system to see where to test what the problem is. 

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In case others see this. In my case (997 4S cab) vacuum comes from the engine near the drivers side (left) rear wheel well. My vacuum pipe had broken off at this point. Doing so stopped the PSE/Tuning flaps but also meant at startup that vacuum was reduced to the brakes causing them to be less effective initially. From the design, it looks like this point is a weak point in the vacuum system and can easily break off.


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