Yep, smoothed right out.

Does it idle smoothly at a lower rpm now?



Lawrenceville, GA

I just found it !! The vacuum line that runs from the back of the intake to the fuel pump had popped out of the fuel pump. Funny how something so simple cost me 3 days of work and worry !! Thanks for all you guys input !

When you have the carburetor off, close the throttle completely and make sure the plates are centered within the bores.  You can shine a light from one side  and look through the other and that will help you to see if the plates are installed correctly.
Another thing to check, make sure that the secondaries are closed.  There is a screw that you can adjust from the bottom to open or close them.

If these check out, then you have a vacuum leak.  It doesn't matter what a vacuum gauge tells you, it's pulling air somewhere other than the throttle bores. 




Lawrenceville, GA

I think this engines been apart so it wouldn't surprise me if it had a small cam in it. I ran the valves and the head valleys are clean as new and the plugs all looked excellent and in the 2 years I've owned it I've never had to even top off the oil. I can't stand it though when I think something isn't running just right. It's also been converted from points so I bought a new cap and rotor I'm going to try tomorrow.

There's been some post recently about wrong size PCV valves. Might be worth plugging that, and see what the vacuum/idle does. It doesn't take much of a cam to require 800 rpm, even my old Y-270 liked it at 900. I'm running a stick, so no big deal.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

Already been the vacuum gauge route. It pulls about 18 inches of vacuum and the needle does wobble but only about an inch of vacuum or so. The timing doesn't change anything. I did find out about the fuel bowl vent I was talking about earlier. It was used on pre 1970 factory equipped Holley's to try to let the bowl vent when it was heat soaking after you shut it off to try to prevent boiling or vapor lock. This thing has a plate below the carb to convert it to a PCV valve and I'm starting to lean towards the base gaskets. I sprayed some carb cleaner around it but it didn't change the idle. I'm going to pull the carb tomorrow and see what's going on there. 

Found this a few years ago-not fully encompassing, but pretty handy

Mike Rizzo

1963 F100 "Rudy"

Daniel Island, SC

Manual or auto?  Could be a vacuum leak as suggested . How advanced or retarded are you with your timing? . Start learning how to use a vacuum gauge, best tool you can have.



"Came too close to dying to stop living now!"

I don't know what that is but certainly any deviation from stock can affect the carburetor and therefore the way the engine runs.  That is something worth looking into.



Lawrenceville, GA