To the right of the oil filler cap, with the black and blue wire connected to it. I'm removing some of the emissions stuff and couldn't figure out what it's for. I've searched...a lot.

It's on a 1990 13B NA

 

foxed.ca site has the manuals and diagrams. they may help identify it.

 

Couldn't find anything there, but thanks for sharing the site!

 

Anyone?

 

welcome to the board.

was it connected (by hose) to a port on the intermediate housing?

 

Thank you. One end went to the air intake hose and the DS end connected to the upper intake manifold.