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Discussion Starter · #1 ·
I just inspected the MAP sensor on my new to me 2006 MDX.

It seems like the "port" (hole) that the sensor goes into is a sealed chamber.

It looks like it has a curved metal bottom.

How does the MAP sensor work if it is not exposed to the actual air flow in the throttle body?

Or does that metal bottom open up when the engine is running?

The old sensor was very clean and the port only had a tiny bit of dust inside of it. I imagine this is probably the original sensor.

I attached a picture of the "port".
 

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Possibly the "Plug" in the port is permeable and allows a trace of air through it, while acting as a filter. You could confirm by covering the hole with your finger while running to see if vacuum builds up. Sensor would have to be attached to another port that sees manifold pressure/vacuum.
 

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From cleaning my throttle body with it removed from the plenum a few weeks ago, there's a channel that runs to the left (towards the 27). It turns into a groove inside the throttle body- it becomes a little passage way behind the throttle plate near the mating surface with the plenum.
 
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