Carburator Choke Issue
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Senior User
Joined: Jan 2003
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From: Ohio
Carburator Choke Issue
I recently purchased a 1979 F-350 4x4 with a 351M engine. A previous owner changed out to an Edelbrock 1407 carburator with a manual choke. I purchased an electric choke kit for this carb and installed it per the instructions, but I cannot seem to figure out how to set the choke for a cold start. The power to the choke is on a confirmed switched circuit, the plate on the top is open, and will only close if a manually push it. Once closed, the truck will start and run and the choke seems to work as designed as it slowly opens up while the truck is running and the fast idle is there, and slows down once warm. Once the truck is cold again, I cannot get the plate shut, it stays wide open unless I again manually push it closed, (and it closes easily). On my 1971 Lincoln, all I have to do is pump the accelerator once to close the flap, but that car is all factory, If I pump the truck once, nothing happens, the flap stays open. What did I do wrong?? Thanks.
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
Make sure the tang at the end of the spring is properly engaging the linkage once you install the choke cap. The choke plate should snap shut after one push of the accelerator just like a factory carb.
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Senior User
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From: Ohio
Thanks for the reply, I wonder if I am missing something from when it was a manual choke. When I push down on the accelerator, nothing touches or moves the linkage that is attached to the plate.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
There should be a cam that drops down to peg open the throttle plates slightly when the choke plate is closed - this is the fast idle linkage, and from your first post it sounds like it's operational. When the choke plate is open, the cam drops out and there's no coupling between the accelerator linkage and the choke plate. However, if the engine is completely cooled down (as in sat overnight), the choke spring should have enough tension to put the fast idle linkage back into place with the throttle held open, if engaged properly.
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Senior User
Joined: Jan 2003
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From: Ohio
Ok, I am going to let the truck sit till tomorrow and try it once it is definately cold. The little "tab" that is on the circular spring is to the left of the small rod so the spring should be pushing the choke closed when cold.
Post Fiend
Joined: Apr 2008
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From: Big Sky Country
I prefer a manual choke myself, you control it, you know when it's open or closed, no guess work involved, you activate the choke when/if needed, you decide engine warm up time, not the electric choke.....in my opinion a manual choke is best, if the operator knows how to use it correctly.
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