Intake manifold and boost gauge question.

kerry

Expedition Leader
99 FG. There's a butterfly valve in the front of the intake manifold controlled by vacuum. What is the purpose of that valve? Mine moves freely, perhaps too freely. I wonder if it leaks around the shaft.

Also, there is (apparently) a boost sensor mounted on the front of the intake manifold with a braided hose connecting it to a banjo bolt on the front of the intake. Has anyone installed a boost gauge by T-ing into that braided hose?

There's also a sensor screwed into the left side of the intercooler. What is the purpose of that sensor?
 

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