I've got this s4 TII emissions harness and before I install it into the veh (86 gxl) I would like to ID and tag each of the connectors to make it easier. I'm stuck on this blue connector.

 

Bac

 

thanks man. The motor i have had the bac removed with a block plate so that explains why I can't find the plug lol. Also noticed this vacuum not hoooked up, although it appears to be a vent hose of some kind.

I didn't see it in this diagram.

 

AWS solenoid feed?

 

crankcase ventilation tube. used to go to the "pcv" valve, or our version of it anyways. mazda calls it a "purge control valve".

it is the light blue hose in that diagram.

 

i see it now. Forgot to mention rats nest is gone so would it be wise to cap it? Or just remove the hose and let it vent?

 

best to leave it open but put some sort of filter on the end.

the turbo engines need to breathe otherwise the turbo might burn oil and damage the carbon seal.