In assessing the issue with the carburetor, I believed the issue was a clogged fuel bowl vent. I turned to the experts by posting to the Corvette forum. I described the issue and how I arrived at the diagnosis and received several responses. I was on to something or so I thought, the vent bowl does need to be clear. Then I received a response from Lars. Lars, for those of you that do not know, is what I would deem the Rochester Quadrajet Guru. Lars was quick to point out that I didn’t have a problem with the float bowl vent but rather, I created a problem with the float. At first I was suspect of the response but after a couple more correspondence and on the advice of Lars, I decided the carburetor needed to be rebuilt. It was yet another new adventure.
I ordered the Rochester Quad rebuild kit from Zip-Corvette and did a pile of research. I requested the famous Lars papers which were happily provided by Lars. I figured based on research that the rebuild time would be somewhere between 1 and 4 hours. I prepared a working area in the garage using a white cloth on a table. I pulled out the duct tape and used it to label parts as I took them off the carb. This would prove to be helpful when putting it back together. I removed the 9 screws from the top of the carb including the secondary metering rods and removed the top section of the carb along with the gasket. I then flipped the carb over and removed the two screws from the bottom of the carb in order to pull the mid section and bottom bowl apart. Once I pulled the top section, I could see right away that the float was damaged from where I had checked it… Lars was right. Only problem was that the rebuild kit did not come with a float. It was Friday night at 4:45 PM. I started calling around. I tried the local Corvette dealer and shop who told me they did not have part and they were not sure they could get it. I ordered one online but it would not arrive until Wednesday of the following week. I then called Advanced Auto Parts and to my surprise, they had one in the PA store and could have by 1:00 PM on Saturday. Done. Total cost $10.78.
I removed and cleaned the components of the carb and rebuilt as much as I could needing only to put the float in and complete the reassembly of the float bowl. I picked the part up the following day and was able to the put the float in, secured the float bowl and put the carb back on the car. I reconnected the throttle / choke, vacuum lines etc. I started her up and she idled extremely low and nothing happened when stepping on the gas or manually pulling the throttle. Something was wrong.
After doing more research, I discovered that the small arm on the throttle assembly need to clip into a small metal piece around the assembly inside the car. I totally missed that. I took the carb off the car, removed the air horn and began the tedious process of trying to get the arm connected. After a bit of trial and error, I finally goth it seated and the air horn put back together. I then reinstalled the carb on the car and reconnected the hoses and assemblies. I turned the key and she started up. I pressed the gas and she reved as expected. I then left it at idle and made a small adjustment to the carb. Bingo! She is now idling at 500 RPM and is not not stalling. The rebuild worked!
I am happy to share my experience with this issue with anyone who asks. It was the first time I have rebuilt a carburetor and really, this is my first adventure with working on cars. I have learned a lot by trial and error.