Vacuum/Electrical Question

[dprio34]

The attached foto is of a switch/valve that is electrically connected but has no vacuum input or output. The Bronco seems to be running fine without it, but the question is, what is it, and how should/where should the vacuum connections be routed to? Or should I eliminate it completely? This is off of a 1972 302 with 2 barrel ford carb.

Any help most appreciated.
Regards, Don

 

[jckkys]

According to this diagram from the Mustang Barn sight;
http://www.mustangbarn.com/images/v...nic spark control, and air cleaner sensor.gif
The vacuum solenoid is activated by a temperature switch, (I don't know where it is or at what temp. it turns on) and the vacuum source is the ported vacuum nipple on the carburetor, that only pulls vacuum under part throttle operation. This diagram looks like the EB 302s in '72, but different delivery locations like Cal. may vary somewhat.

 

[Viperwolf1]

The attached foto is of a switch/valve that is electrically connected but has no vacuum input or output. The Bronco seems to be running fine without it, but the question is, what is it, and how should/where should the vacuum connections be routed to? Or should I eliminate it completely? This is off of a 1972 302 with 2 barrel ford carb.

Any help most appreciated.
Regards, Don

That solenoid is part of the transmission controlled spark setup found on some '72s and '73s. Here are some pics from an unmolested original '72 setup.

The ambient sensor switch is in the door post. The spark control sensor switch is in the transmission.

 

[dprio34]

jckkys & viperwolf, Thanks for the info. I searched around and couldn't find anything. There needs to be a level higher than Guru for you guys. The PO put a column 3 speed on the floor. Again, seems to be running fine without it being properly connectled. Need to do some further investigation I guess. Thanks for putting me on the right track!