found cause for losing manifold pressure

[johnny]

For all that are interested I will find out in the next day or so exactly what they did when they disconnected the pressurization. I will also let you know exactly what corrected the problem on the pressurization side. To answer a few questions from several individuals here we go:

1. The dump valves were all the way in
2. From what I understand they did not disconnect at the cabin but rather somewhere near the engine – I will find out for sure in the next day or so exactly what part they disconnected.
3. It was the Richmond, VA Million Air.
4. Yes I am considering charging the mechanic for the items replaced for no reason.
5. You really don’t want to know how much the whole thing cost
6. All I know for sure at this point is that with the rear pressurization system blocked off somewhere near the engine the MP held (31 in) regardless of RPM (2300 to 2550) up to 14,000 – we did not go any higher that day – before it lost MP at 6,000 – Max was 26in with WOT at 2300 RPM – 29 in max with WOT at 2500 RPM.