AAV-26 for 1947 Buick Series 70 Very High Cold Idle
Hi All,
I realized that I lack greatly in mechanic know how, so I picked up a running '47 Roadmaster because A) it's freaking beautiful and B) it's pretty simple for the newbie.
I recently refurbed the carb (using a Then and Now kit) and now having an issue with very high idle at cold start (higher than before I touched it), even with the choke mostly closed. As I open the choke it revs higher.
There's chance of a vacuum leak, but doubtful as there wasn't one prior to me messing with the carb. The butterfly valves are fully closed (as far as I can tell) so I'm guessing there's unmetered fuel going in (?).
Fast idle screw is all the way out and idle mixture was 1.5 turns out. Although screwing them all in doesn't affect the high idle at all.
Taking it apart I see that the new accelerator pump's leather shroud is binding- it seems to be just a slight bit too big. Would that cause extra fuel to leak by, resulting in the high idle? Or, any other ideas?