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03-19-2020, 06:05 PM | #1 |
Junior Member
Join Date: Dec 2016
Posts: 15
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Hot idle adjustment screw
I have a Holley 4000 carburetor in my '56 Thunderbird. I cannot see what the hot idle speed adjustment screw pushes against to raise and lower idle speed. Here is a picture of my screw. Am I missing a part or do I just not understand how it works?
Thanks. Jim Yergin |
03-19-2020, 09:43 PM | #2 |
Senior Member
Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 3,706
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Re: Hot idle adjustment screw
The hot idle speed adjusting screw (with the spring on it) is supposed to contact that round pin directly in front of it. Either the dashpot screw on the throttle lever is adjusted too far out, or the fast idle cam on the other side of carb isn't dropping (choke not all the way opened ?). Or the return spring on the throttle linkage isn't working.
Sal |
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03-20-2020, 09:24 AM | #3 |
Junior Member
Join Date: Dec 2016
Posts: 15
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Re: Hot idle adjustment screw
Sal,
Thank you very much. Jim Yergin |
03-20-2020, 12:56 PM | #4 |
Senior Member
Join Date: May 2010
Location: Lancaster, CA
Posts: 917
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Re: Hot idle adjustment screw
I just posted two videos to YouTube, and I have quite a bit on these 4000s on my personal website. I do not know near what Sal knows - he has been a tremendous help to me! But maybe some of the footage you see will you identify what you need.
Link to YouTube: https://www.youtube.com/watch?v=zQlQeFVJjo4 (there is a part 2 as well) and then my blog posts with further information: https://www.hotrodreverend.com/blog/categories/fuel enjoy...
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Lancaster, California Visit hotrodreverend.com to view hundreds of pictures and videos of the build of the 1955 Ford Club Sedan! |
03-20-2020, 09:06 PM | #5 |
Senior Member
Join Date: May 2010
Location: Midland Park, NJ
Posts: 3,982
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Re: Hot idle adjustment screw
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