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02-09-2012, 06:04 PM
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#1 |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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Mystery Screw on Quadrajet!
Can anyone tell me what this screw does? Its a Quadrajet 17057213.
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02-09-2012, 06:43 PM
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#2 |
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Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: Mystery Screw on Quadrajet!
I could be wrong but it looks someone plugged a vacuum port.
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02-09-2012, 07:13 PM
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#3 |
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Just here to tinker
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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Re: Mystery Screw on Quadrajet!
I agree with rs72z. There is definitely nothing to adjust there.
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02-09-2012, 07:13 PM
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#4 | |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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Re: Mystery Screw on Quadrajet!
You may be right because I tried turning it and it wouldn't budge!
Quote:
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02-09-2012, 07:39 PM
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#5 |
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Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,366
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Re: Mystery Screw on Quadrajet!
According to the Rochester Carburetor book by Doug Roe, that's the early form of the APT (adjustable part throttle). The screw adjusts the lower stop for the power piston. That screw was normally adjusted at the factory and then covered with a little press-in plug. The later Q-Jets have the APT system in the fuel bowl.
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