Electronic Choke Installation

The solenoid for the electronic choke needs 12v+ to operate, but won't do anything until the engine is running. A switch is wired in line with the power source to control it, either battery or ignition switched 12v is fine. The ground wire is already installed.

[12v+]-----[switch]-------[solenoid]------[ground]

The dash switch


It uses the throttle opener which is originally part of the A/C circuit. When vacuum flows through this device, the arm is pulled upwards, which pulls on a lever on the throttle shaft to open the throttle, raising the idle speed. The solenoid simply controls when vacuum can flow through it, having one vacuum hose sourced from manifold vacuum and the other leading to the throttle opener.



Adjusting the idle speed is done in one of two ways, depending on which model of throttle opener you receive. One has a nut on the lower arm which can be screwed in or out to adjust the idle speed (see photo above). The other has a pin on top which is screwed in or out to adjust idle speed.

First carb is off and running...

Sold the first one today. :D I'm very pleased with it, saw a nice improvement even when testing it on my stock 12A. Few pics:

Cleaning up the A/C circuit

Successfully tested a different method of raising the idle when the A/C is turned on. This gets rid of the throttle opener and that rat's nest A/C solenoid.

All it does is use the idle richer circuit/solenoid, which is built into the drivers side of the carb, to raise the idle. Normally this circuit just richens the idle mixture but by opening it up a bit it can raise the idle speed as well. All that needs to be done then is to connect the solenoid positive wire to the A/C relay, so that it's triggered whenever the A/C is turned on.

Work has begun!

Received the first two carbs in the mail today, and have begun inspecting and dismantling them. One is an older style carb with the power valve, while the other is a newer model.