What is this part?

[renny]

On my vacuum diagram label its called a tip in solenoid it mounts to the firewall on my 1985 K5 and has a vacuum hose going in one side and two wires coming out the other side.
My Haynes manual doesn't mention anything about it. Thanks in advance.
Ren

 

[bablazer73]

sounds like the vacuum sensor for the old E.S.C. (Electronic Spark Control) ignition system. This replaced the vacumm advance.

 

[pauly383]

If you have two , one on each side of the truck . The one on the drivers side is for the lockup on the trans , and I believe the other one is like Henry said /forums/images/graemlins/k5.gif /forums/images/graemlins/k5.gif

 

[zach78k5]

Can the one for the lockup be disconnected? I am using a holley projection so most of the vacuum came out. can I connect the tranny lockup to the intake vacuum or to something else?

 

[dyeager535]

The vacuum source for the switch can come from any manifold vacuum source, but if you are running the 700, you need to leave that switch functional, if thats what you were asking.