Socket on top of some TB's

[Dxs]

Just wondering what the black socket on top of these throttle bodies is for?

http://www.maxbore.com/tbbeforeafter-1.jpg

the one of the side is the TPS but the top one??

i dont have such a thing on the top of my b16a1 TB

[CRXer]

MAP sensor,yours is probably on the firewall attached by a vac hose

[Drew]

^ yeah that

[EG5[KRT]]

map sensor as crxer said !!!

[CRXer]

Actually it is on the firewall,heres yours in the red circle

http://i58.photobucket.com/albums/g268/CRXer/IMG_0934Small.jpg

[ACTI0NMAN-1]

b18a's on da9s have them on the wall too.

[Dxs]

thanks for all the responses!