Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Choke and Fast Idle Relationship

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Cliff Ruggles:
Hot air chokes are very reliable, as long as the intake gaskets aren't blocked off.  They provide a lot of heat to the choke tubes, so they open quickly. 

It may take several attempts to find the ideal position for the choke, choke pull-off, and fast idle speed adjustment.  You have to work quickly on a dead cold engine to make accurate settings. 

Best to set the dial so it just barely closes the choke flap on a cold engine, and use this as the "base" setting.  The choke flap should snap shut on a cold start, and be fully open within 3 minutes.  Turning the dial to the right (clockwise) shortens opening time, to the left makes it stay on longer.  If you turn the dial too far to the right, the choke flap doesn't fully close, making the engine more difficult to get started when cold.....Cliff

thumper:

--- Quote from: Cliff Ruggles on June 15, 2012, 08:10:06 PM ---Hot air chokes are very reliable, as long as the intake gaskets aren't blocked off.  They provide a lot of heat to the choke tubes, so they open quickly. 

It may take several attempts to find the ideal position for the choke, choke pull-off, and fast idle speed adjustment.  You have to work quickly on a dead cold engine to make accurate settings. 

Best to set the dial so it just barely closes the choke flap on a cold engine, and use this as the "base" setting.  The choke flap should snap shut on a cold start, and be fully open within 3 minutes.  Turning the dial to the right (clockwise) shortens opening time, to the left makes it stay on longer.  If you turn the dial too far to the right, the choke flap doesn't fully close, making the engine more difficult to get started when cold.....Cliff

--- End quote ---

thumper:

--- Quote from: thumper on June 16, 2012, 07:40:23 AM ---

--- End quote ---
Thanks Cliff!
I shortened opening time and will start there. Choke has been holding on too long for my taste. For now I'll keep the fast idle at the factory recommended 1600 rpm.
With the fast idle always wanting to engage, a roller in the transmission takes a beating with a band.
What are the options for the choke pull off settings?
Thanks again for a great rebuild. I am starting to get some dark greasy spots on the front of the carb. Should I consider some gaskets...?

Thumper

Cliff Ruggles:
The rule of thumb on the pull-off is to set it so it unloads the choke and the engine runs smooth on the first cold start attempt.  Best to er on the lean side just a bit (flap open further), as it is better than having the flap too far shut and "washing" down the engine. 

The choke should be fully open in about 2-3 minutes, and has a wide range of adjustment.....Cliff

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