Choke Adjustment

[BeerDontCount]

Just wondering if anyone else has to adjust their electric choke for cold weather (32 degrees f.). I got mine started today and it wouldn't kick down off of the high idle until I adjusted it. I had to put it all the way to the right side to get it to idle normally at operating temp. My setup is a stock 351c 4v with a 770 avenger, and this is the first winter for me with this carb. Is this normal or do I have an issue? Appreciate the feedback.

Scott

 

[delawarebill]

does that carb have a separate vac line or is it the little piston inside the unit? i would ck to make sure u have vac. or maybe the little piston is sticking. either case the vac should be opening the choke plate somewhat.. yes they can be tricky to play with.

 

[c9zx]

Just wondering if anyone else has to adjust their electric choke for cold weather (32 degrees f.). I got mine started today and it wouldn't kick down off of the high idle until I adjusted it. I had to put it all the way to the right side to get it to idle normally at operating temp. My setup is a stock 351c 4v with a 770 avenger, and this is the first winter for me with this carb. Is this normal or do I have an issue? Appreciate the feedback.

Scott

Where are you getting the full 12 volts to power the choke from?

 

[goodnigh]

Have the same setup as you and choke works fine.

+1 on the 12 volt source.

mike

 

[BeerDontCount]

I'm not sure where the line originates. I changed it from a Holley 600 to this and just used the same power source. Where should it be coming from?

 

[Don C]

The stator terminal on the alternator is the best, that way the choke is only energized when the engine is actually running. Connecting it to a 12 volt keyed source means that when the key is on the choke starts warming up, whether or not the car is being started.

Check the terminal on the choke with a voltmeter, when the engine is running, to make sure that it is receiving 12 volts. It sounds like it isn't being energized, warming up, and opening the choke.

 

[c9zx]

Starting in 1973, electrically assisted chokes were used. They still required manifold heating to operate correctly. The choke bi-metal spring used was designed to use the low AC voltage present at the S terminal of the alternator. The electrical choke supplied with modern carb are designed to work with 12 VDC. Choices are find a switched 12 VDC source to feed the choke anytime the key is on (which has it's downside) or use a relay activated by the AC voltage from the S terminal on the alternator to send switched 12 VDC to the new choke. Chuck

 

[Don C]

Good point, Chuck. The stator terminal only puts out around 6 volts, which would cause slow operation and opening of a choke that is designed to run on 12 volts.

 

[BeerDontCount]

Thanks for all the info. Sound like thats the source of my problem. Really appreciate the advice.

Scott