I have an 88 305 TPI that I bought last year. I've been having some problems occasionally and just the other day I found this plug that isnt connected to anything, and I can't track the wire back. It is on the passenger side, right next to the distributor, can anyone help me identify where this plug goes?


Passenger side by distributor

 

What colors are the wires?

There's a connector, in all of these cars AFAIK, that doesn't hook to anything. Wires are pink/black and black. Which are, ECM ign and gnd. I.e. powers everything the ECM is concerned with, including the ECM. Probably was an sub-assy test connector, allowing the whole engine electronics w/ ECM to be powered without being hooked to a car. (or maybe not even an engine...)

 

There's two wires, the first one is red, and the second one is either gray or light green. It's at a hard to reach location and I tried to get as much dirt off as possible.

 

May go to the EGR solenoid; that object in the pic with the 2 vac lines going to it.

 

That is exactly where it goes! Just found the plug! Any idea what it does and how it affects the motor running?

 

It activates the EGR. May help control pinging at cruising speeds, thus allowing more ignition advance; otherwise, little effect, in the TBI system.