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I will try to be brief, but I really really need some assistance with this one... I've exhausted my troubleshooting efforts and am losing moral. Bare with me please 
The story
I rebuilt my '88 L. I had Aspire pulleys, so I used the Aspire alternator, but I had no choke heater port. I wired a 12v lead to go to the choke heater and used that for a few months to power the heater. After awhile, the choke stopped working correctly. I had assumed my choke heater fried, so I swapped carbys, and made a simple circuit to drop the 12v to 7v so that I wouldn't fry the 2nd carb. I found the 92-93 Festiva pulleys and put the Festiva alternator back on. Choke heater function works great on the 2nd carb. I found another choke heater assembly from a jy and swapped it onto the 1st carb. So!
I finally swapped the 1st carb back onto my vehicle, but, once running the idle never drops below 2000-2500. This has led me to believe the FICB is just not functioning properly.. The FICB diaphragm is good, the choke heater is good and receiving current, and the ported vacuum switch is good (since the other carb worked correctly). When I pulled the air cleaner after running for a bit, I found this:
The main airhorn flap was just wide open and didn't want to return to being closed. If you played with the accelerator arm, and the FICB diaphragm lever, it still wanted to 'fall down' and the flap stayed open. The other carb's FICB assembly has a tendency to rotate counter-clockwise and push the lever up and the flap closes like this:
From looking at it and playing with it for a long time, I can not ascertain why the assembly 'goes limp' and does not return to it's original position.
What can make a FICB function this incorrectly?
The story
I rebuilt my '88 L. I had Aspire pulleys, so I used the Aspire alternator, but I had no choke heater port. I wired a 12v lead to go to the choke heater and used that for a few months to power the heater. After awhile, the choke stopped working correctly. I had assumed my choke heater fried, so I swapped carbys, and made a simple circuit to drop the 12v to 7v so that I wouldn't fry the 2nd carb. I found the 92-93 Festiva pulleys and put the Festiva alternator back on. Choke heater function works great on the 2nd carb. I found another choke heater assembly from a jy and swapped it onto the 1st carb. So!
I finally swapped the 1st carb back onto my vehicle, but, once running the idle never drops below 2000-2500. This has led me to believe the FICB is just not functioning properly.. The FICB diaphragm is good, the choke heater is good and receiving current, and the ported vacuum switch is good (since the other carb worked correctly). When I pulled the air cleaner after running for a bit, I found this:
The main airhorn flap was just wide open and didn't want to return to being closed. If you played with the accelerator arm, and the FICB diaphragm lever, it still wanted to 'fall down' and the flap stayed open. The other carb's FICB assembly has a tendency to rotate counter-clockwise and push the lever up and the flap closes like this:
From looking at it and playing with it for a long time, I can not ascertain why the assembly 'goes limp' and does not return to it's original position.
What can make a FICB function this incorrectly?
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