What is this?

[roosduster]

This really isn't an engine problem but it is in the engine bay so I figured I would put it here. I had something in that same area on my Duster which is now just two empty holes and I can not remember what was there. I don't know if it was the same thing that is in the pic since I have two holes and this to me would look like it would have one with that black part removed. So I am just trying to remember what could have been there, my Duster is a 73 and it had emissions equipment on it when I got it. I'll take a pic of the holes I am talking about in my car tomorrow and add it to this thread.

 

[moper]

That is the solenoid that directs the vaccum signal to the distributor's vaccum can. On the later (post '72 IIRC) cars, there was a timing resistor that openned the choke, and delayed the vaccum to the distributor's vaccum can until the engine temp was up. (it only used time, not temp, but it was set for like 5 minutes of run time) When the resistor closed the circuit, that solenoid openned, and vaccum could get to the can. At least that's the way I remember it.

 

[rumblefish360]

OSCA valve I thopught it was called? A 15 second delay on vaccum operation.