does your car have AC? it will help stabilize/control the idle when the AC kicks on and off.

 

It doesn’t have ac. I think it makes the idle go high at startup but I’m not sure if I’ll need it with a new carb.

 

Those are also used as anti-dieseling or anti-run on solenoids, in addition to A/C idle speed kickers. On a hot day, with low quality gasoline, your engine might tend to keep running (i.e. dieseling) when you switch off the ignition. This is especially an issue on high compression engines. With this solenoid, the idle passages are closed completely when you switch off the ignition, and the engine gets no fuel, therefore will not continue running.

 

would you happen to know if there’s a way to transfer it to a new edelbrock carburetor

I can find one with a bracket but the plug is different. And like you said. The one I find is for the ac

 

Search Edelbrock's website, or Summit, they might list one for their carb.

 

I have the Edelbrock idle compensator for use with my AC. It works good but is rather pricey
plus the carb throttle spring will need to be in the rear as there will be no room in front.

Edelbrock Throttle Return Spring Kit | Hot Rod Innovations

 

What is this called? Idle control valve-solenoid? Do I need it?

can I remove it if I change the carburetor? I’m going from a 2 barrel to a 4 barrel edelbrock View attachment 834124
View attachment 834123 View attachment 834137

I came across this a few years ago when I was asking the same question.

 

That has NOTHING to do with idle control, as was explained, when ignition is switched off, it allows the throttle plates to Close completely to avoid run on from lean mixtures. When the ignition is turned back on, it open the throttle plates again to curb idle speed.

 

The short answer: You will not need to use this ever again unless you are doing a 1000 point concours restoration OR you end up living in an area that requires 100% factory emissions controls in place for emissions inspections and testing.

The long answer:

It is obvious this is a 1971 CEC solenoid. CEC = Combined Emission Control. This was a highly modified version of the 1970 TCS (Transmission Controlled Spark) system.

"Combined" describes the solenoid. Not only does it block/allow engine vacuum to the vacuum advance on the distributor, but the plunger portion affects the deceleration throttle blade opening.

It is NOT for Air Conditioning. It is NOT a simple idle speed control solenoid. It does NOT set or open curb idle speed.

This was done for emissions control.

From the 1971 Chevrolet Emissions Control Theory and Diagnosis Handbook:

"Curb idle speed and high gear deceleration throttle blade setting will be performed with the solenoid in the non-energized position. With the vacuum line removed from the distributor and plugged, and the electrical connection also removed, the curb idle speed is set with the carburetor screw. The throttle stop adjustment screw is then pulled out to its most extended position and adjusted to a specified RPM to provide the desired high gear deceleration throttle blade opening. Thus, two separate throttle settings are now possible--one for curb idle and one for declaration hydrocarbon control."

Here is a N.O.S. CEC solenoid I own......notice the label.....