10-18-2010, 09:48 AM
Electroncily activated vacume solinoid. Hard to say what it controls, most purge valves in the 70's were temp controled (in the thermistat housing). The closer you get to the end of the 70's there were many added emssion vavles. Check your rig for a vacume diagram or give exact year of the engine and it can be looked up.
[SIGPIC][/SIGPIC]