What is this for?

[rogelioifmradio]

Hi! Can you guys tell me what tris little black box is for?
And also, take a look at my gillis valve and tell me if it os correctly installed please

[rob342]

Black box is barometric pressure sensor

[rogelioifmradio]

Ok, but what is it for... I disconected the harness and nothing happened

[rob342]

Here's a decent read about it. Basically It helps the computer adjust spark and fuel for altitude and pressure changes. Without it I would guess that your car runs on the calibration for sea level... ..Or pikes peak. http://www.modularfords.com/content/...ressure-Sensor

[rogelioifmradio]

Now i get it...
And about the gillis valve? Is it properly conected?