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  #1  
Old 01-04-2007, 01:36 PM
GWP GWP is offline
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Default 1960 352 Carb. EFA OBB F "Hesitation on Initial Accelo

I have a problem with hesitation, during initial accel from a stand still, to the point of the engine wanting to die if I do not remove pressure from the accel pedal and play with it until the car is under way (around 3-4 mph). The car has backfired before, maybe messing up the power valve.

I am getting various comments on the cause of the problem. The power valve kit or shield (maybe just protection against blowing the power valve). Maybe also a blown power valve (I have not checked to see if when the needles are turned in all the way, the engine still runs - indicating a bad power valve). Blocking the power valve permenantly, which I understand is not the thing to do. Also, maybe a dirty accel pump shooter or a shooter that is too small. I have replaced the accel pump.

I would like to fix the problem the easiest way if possible. Only if it comes to it, pull the carb and rebuild. I am always pressed for time. Anyway, is the carb a Holley? Or Ford? And what would the model number be so as to get a kit or shooter valve, etc?

The car runs fine after it gets going and starts OK. Obviously, I am not a carb guru. Bill
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  #2  
Old 01-04-2007, 02:33 PM
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Default RE: 1960 352 Carb. EFA OBB F "Hesitation on Initial Ac

Either the accelerator pump diaphragm is bad or you need to adjust the rod to the accelerator pump to give the motor an bigger shot of gas so it does not stumble.

Alexander
1959 Hardtop
1960 Golde Top
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  #3  
Old 01-05-2007, 03:59 PM
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Default RE: 1960 352 Carb. EFA OBB F "Hesitation on Initial Ac

Thunderchicken60
Sounds like a Ford Carb.mine did the same thing.Instead of rebuilding it I just bought a new Holley for less than twice the cost of a rebuild.To my dismay it continued to hesitate to the point as you said I had to back off of it to keep it from stalling.
A friend of mine suggested I put a couple of drops of motor oil into the padding of the middle post of the distributor.(under the rotor) I guess after a while the vacuum advance was sticking,it seems to have worked the car starts out fine now.It's a cheap fix if it works.Good Luck George
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  #4  
Old 01-05-2007, 07:26 PM
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Default RE: 1960 352 Carb. EFA OBB F "Hesitation on Initial Ac

Interesting.
I plan on spending some time on the problem tomorrow. I will first try to turn in jets in all the way to see if the engine dies or continues to run. I want to see if it is the power valve or not. Then I might try to remove the accelerator pump shooter to see if it is stopped up or maybe go try to get a larger size. Then maybe your idea. Then I don't know yet...
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Old 01-05-2007, 07:34 PM
tbirds8 tbirds8 is offline
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Default RE: 1960 352 Carb. EFA OBB F "Hesitation on Initial Ac

Hi ALL. My two cents. There is one more place to look for a hesation.were the vac. advance connects to the point plate gets a groove in it and will cause problems. I also put a 650 holly on my 60 and what a mistake. Many $$$$$$$$$$$ later I sent the right carb. to pony carb. It never ran this good. Were are those numbers from? That sounds like a an 80's carb. Later...........Bill
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  #6  
Old 01-08-2007, 09:50 AM
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Default RE: 1960 352 Carb. EFA OBB F "Hesitation on Initial Ac

This problem remains a mystery. I tried turning the needles in all the way - the engine continued to run, but died after about 2 min. Not sure if that told me the power valve is good or not. I put a few drops of oil under the rotor in the distribitor to help the vac. advance. That did not help. I have the linkage adjusted so that the new vac. pump will supply the most fuel. That did not work. I can see some fuel come out of the shooter upon initial acceloration. Unlike a Holley carb, I cannot just simply remove the shooter valve with one screw so I did not check that.

I hate to rebuild the carb if it is something very simple that I do no understand. I just know that it is dangerous driving like this due to the great possibility of stalling in the middle of an intersection.
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Old 01-08-2007, 04:03 PM
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Default RE: 1960 352 Carb. EFA OBB F "Hesitation on Initial Ac

First off that should stall right away when you turn the screws in. and it doesn't sound like you have the right carb there. Number should start COAE-J or K and it's an autolight 4100 (no electric chokes, won't work on these). Good luck...............Bill
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Old 01-08-2007, 05:02 PM
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Default RE: 1960 352 Carb. EFA OBB F "Hesitation on Initial Ac

Under the Technical section of the Squarebird main page, there is a picture of the carb. tag from an original 1960 carb. My tag looks just like it except for two letters.
The tag on the SB site is:
Series: EFA, Type: OBC, Date: L
My tag is:
Series: EFA, Type: OBB, Date: F

Do you still think it is not the correct carb?

So, with both needles turned completely in, the engine should die imediately? Then I have a power valve problem? The carb has backfired a number of times, which I hear will cause the power vavle to blow out?

I am thinking that a carb rebuild is in my future....
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Old 01-08-2007, 06:04 PM
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Default RE: 1960 352 Carb. EFA OBB F "Hesitation on Initial Ac

Rebuilding these Autolite 4100 carbs is easy. It requires no special tools.

If you open up the top of the carburetor, you may be surprised to see how much much is in the bottom of those bowls.

Alexander
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1960 Golde Top
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  #10  
Old 01-08-2007, 06:08 PM
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Default RE: 1960 352 Carb. EFA OBB F

Hi, hard to say,I'd have to see it but you definetly have carb. problems there. The #s I'm talking about are on the base of the carb right by the front driver side mounting stud. Above that is what looks like a clock face it should say 1:08 or1:12 the 112 being the rihgt one. The problem with the tag is it could have been changed by a rebuilder who was doing alot of them at one time. I think that thing is loaded with dirt and gummed up with old gas. O does the tag say autolite or motorcraft? Later........................Bill Sorry.. I see what you mean on this site . I didn't see that before. that's the tag on mine i don't know what the numbers are But I'll pull air cleaner tommorow. If you know a good lawnmower shop they might let you soak that carb. in their bucket of !@#$% but it works.....Later
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