rebuilt holly

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Feb 15, 2009 | 04:22 PM

Globalwarmer

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rebuilt holly

I recently rebuilt a four barrel cabrburator on my 77 f150 after re-installing a new problem arose. Now evertime I stop and idle the idle speed increases so that I have to place the transmition in neutral to keep it from taking off. I checked the throttle linkage and its not sticking. Does any one know what the cause could be? This is an automatic 1977 F150 400. Thanks.

Feb 15, 2009 | 04:48 PM

pinkpanther

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Joined: Jan 2006

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From: Bethel,Ohio

Could be the floats need adjusted. What Holley is it.The 4160 or 4150. Does it have a vac. choke? Could be alot of things.

Feb 15, 2009 | 05:42 PM

Globalwarmer

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No its a manual choke I adjusted the floats when l rebuilt the carburater sorry its a 1405 edelbrock

Feb 17, 2009 | 03:39 PM

dakonthemountain

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Joined: Aug 2003

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From: Crestline, California

You may need to re-adjust the timing with a new or rebuilt carb. I did with my new Iddy Performer carb. Also, the jets in the carb may now be the wrong size for your engine. I am going through this right now. After replacing he metering rods it improved, and next I am putting larger jets in to slow it down. Is it only when it's idling, only when it warms up, or all the time? Did you adjust the fast idle screw? The idle circuit screws? Just a few thoughts. Good luck!
Dak