79 Ford Ford f250
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79 Ford Ford f250
I recently changed carbs on my 79 Ford f260 460ci. I removed the Holley that was on it and replaced it with a new Holley 600cfm. On the old carb there were intake vaccum lines behind the choke, the new ones does not have that. I installed the new carb, new PCV valve, new vaccum lines. once I got the truck started it revved sky high. There is clearly a high idle issue and I'm at a loss on what to do. I'm learning this as I go so any help would be greatly appreciated.
More Turbo
Joined: Apr 2007
Posts: 656
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From: Salisbury, PA
Youtube is your best friend. Plenty of great videos getting your Holley dialed in. Don't think you can just take a carb out of the box, bolt it on, and expect it to work perfect. Setting idle, setting the floats, checking the spark plugs and putting in different jets, etc. to get it running great.
Thread Starter
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New User
Joined: May 2019
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Youtube is your best friend. Plenty of great videos getting your Holley dialed in. Don't think you can just take a carb out of the box, bolt it on, and expect it to work perfect. Setting idle, setting the floats, checking the spark plugs and putting in different jets, etc. to get it running great.
More Turbo
Joined: Apr 2007
Posts: 656
Likes: 5
From: Salisbury, PA
Too high a fuel pressure and the needle won't close. It will be dumping huge amounts of gasoline down in your engine through the vent and should probably make it smoke like crazy, not rev sky high. The throttle plates in the two main barrels should essentially be completely closed at idle. It doesn't take much of these being open to make it rev high at idle.
Thread Starter
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New User
Joined: May 2019
Posts: 3
Likes: 0
Too high a fuel pressure and the needle won't close. It will be dumping huge amounts of gasoline down in your engine through the vent and should probably make it smoke like crazy, not rev sky high. The throttle plates in the two main barrels should essentially be completely closed at idle. It doesn't take much of these being open to make it rev high at idle.
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