There are two wires hooked up to it and has one vaccum port (now have EGR valve hose attached there, but 99% sure that is wrong). Could it be for the smog pump...removed As you can see in picture...rubber fuel line , only temperary, just bought 40" 3/8 steel brake line to replace...also all hoses to be replaced as soon as everything gets straightened out and running properly.



Thanks for any help...car running good with new Holly carb and now having headlights open with override switch...finally, Yes another problem but working on it.

 

I would say its the TCS solenoid, but its on backwards and should be back a bit

 

Okay....I give up, what is the TCS solenoid? Do you think someday my valve covers could look that nice.



These vaccum lines are giving me a pain...only today found line not hooked to anything...from vaccum canister so I connected it to front of carb. That was when the lights started going up by override switch for first time in couple years. Like I said...work in progress.

 

Transmission controlled spark(TCS). Regulates the vacuum advance. By-passed by most, since is was a dumb idea.

 

That is the TCS solenoid. Don't know what year you have, but here is a description of the TCS system that was used in 1970.

It is a pretty simple system. The vacuum that would be available to the distributor vacuum advance is controlled by a solenoid valve. At idle and in neutral, the TCS solenoid valve blocks the vacuum to the distributor vacuum advance and vents the distributor vacuum advance to atmosphere. In 3rd and 4th gear, a switch mounted on the transmission applies power to the the TCS solenoid and thus provides manifold vacuum to the distributor vacuum advance. So, there is no vacuum advance in 1st or 2nd, but only in 3rd and 4th. This was done for emmisions.
In addition, there is a two terminal thermal switch mounted in the passenger side head. When the car is first started and if the temperature is cold enough, one half of the thermal switch, the low temperature switch, will close and activate the TCS solenoid so as to provide vacuum for spark advance for a cold engine, for improved idle and idle speed. Once the engine begins to warm up, that thermal switch will open and the system will go back to normal operation.
If the engine temperature gets too hot, say while you are idling in traffic, the other half of the thermal switch, the high temperature switch, will close and activate the TCS solenoid to provide vacuum advance so that the engine will cool some. Once the engine temperature falls below the high temperature switch limit, the high temperature switch will open and the system will return to normal operation.
This is how the 1970 factory system is set up. Of course, after all these years, your particular car may have been modified to bypass some or all of these functions. I hope this helps.

 

My car is a '74. All this sounds fine but how can you tell if it is working properly? Should I go with it or do away with that setup? My car is old enough that it doesn't require California smog checks...that is why the smog pump is gone and the exhaust manifold (smog rails?) will be gone soon and threaded plugs put in.holes.

 

Looks to me you have it by passed now. Appears a hose from the carb goes back to the distributor? Your photo doesn't show that far back

Also your second shows theother end of your solenoid, (which is really the rear),but the 2 nipples are broken off. So I can't imagine that works