esty Posted September 2, 2022 Share Posted September 2, 2022 (edited) weber 38/38 carb, about 17 years old but not many miles on it...the fuel/air mix screws have no effect on idle, etc...it had some old gas it it, is it likely i just need to take it off and clean it ...only when you screw the mix screws all the way in does it have any effect on idle, it stalls Edited September 2, 2022 by esty Quote Link to comment Share on other sites More sharing options...
albatcha Posted September 3, 2022 Share Posted September 3, 2022 It's possible that what you describe could be normal. Depending on how all the way in you mean. On my car I would say the idle mixture screws only have an easily noticeable effect from all the way tightened to like 0.5 to 1 turns out. I think I remember the adjustment instructions saying something like when the idle is good if you have the mixture screws turned out more than 1.5 turns get bigger jets, less than 0.5 turns get smaller ones. Quote Link to comment Share on other sites More sharing options...
Schnellvintage Posted January 7 Share Posted January 7 Make sure the throttle plates or butterflies are closed enough to only be on the idle circuit. Properly setup, there should be zero ported vacuum. I always use a vacuum gauge to make sure. fwiw Quote Link to comment Share on other sites More sharing options...
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