electric choke Question

[tomking]

I have electric chokes on both my GTs with Weber carbs. One though has a small sensor of some kind located just behind the choke. The wire from the choke jumps over to this sensor also. the choke resistance is 11 ohms and the sensor resistance is about 41 ohms. What is this sensor for? Thanks.

[tekenaar]

Originally posted by tomking I have electric chokes on both my GTs with Weber carbs. One though has a small sensor of some kind located just behind the choke. The wire from the choke jumps over to this sensor also. the choke resistance is 11 ohms and the sensor resistance is about 41 ohms. What is this sensor for? Thanks.

That would be an ICO (Idle Cut Off) solenoid which cuts off fuel in the primary idle circuit as soon as the ignition key is turned off . . . ie. as soon as engine stops. Actually an emission control device for lower CO, but useful to prevent "run on/dieseling" when engine is turned off.

Connect both ICO and electric choke leads together and run to GT passenger-side horn + connector (black/yellow wire). This is stock '73 GT wiring, the only year GT had electric choke. ICO MUST be wired to "switched 12V" source, as it stops ALL idle fuel and engine will not "idle" unless accelerator pedal is kept depressed. HTH

[chilly_75]

Tom, or anyone else...

I'm expecting my 32/36 electric choke to show up sometime soon. But, I'm not seeing the sensor that you're talking about. Can you post a picture? I'm unsure at this point where to connect the electric terminal on the choke. Thanks!

[tomking]

Chilly that sensor I was referring to is an ICO solenoid, idle cut off solenoid. It isnt a sensor. It stops an engine from dieseling when it is shut off. Most carbs dont have it, but it was apparently required in California. Dont worry about it, just connect your electric choke to 12v from a switched circuit.

[hrcollinsjr]

Originally Posted by tomking Chilly that sensor I was referring to is an ICO soleniod, idle cut off soleniod. It isnt a sensor. It stops an engine from dieseling when it is shut off. Most carbs dont have it, but it was apparently required in California. Dont worry about it, just connect your electric choke to 12v from a switched circuit.

Chilly,

Check post #2 for where to hook up the choke. The ICO isn't present on every carb. If you have one I believe it is fitting where the primary idle jet is located. If you don't see an extra electrical hook up then you should be home free by just wiring the choke.

Harold

[chilly_75]

Thanks, guys. The carb and a few more remaining wires are the last things I do before firing up this engine for the first time. I'm excited to see if it runs ok. Then I'll start working on making it more presentable.

In case anyone is interested, here's what I've done in the past few weekends:

- re-installed engine and transmission, as it was out when I purchased it
- flushed, cleaned, re-installed radiator
- replaced broken fuel pump
- replaced starter
- adjusted out-of-whack headlight mechanisms
- replaced fuel line
- replaced brake fluid, bled and bled and bled the brakes
- replaced several other brittle lines and hoses
- changed oil and filter
- lots of misc cleaning through layers and layers of dirt inside and out