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Ford 9N, 2N & 8N Discussion Forum
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Carb Trouble

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Roper64

06-25-2007 10:39:40




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I put a new carb on my 8N, it ran fine. I then had some ignition problems and when I got that fixed, I could never get my carb adjusted correct with out leaving it barely choked. It runs good with the choke barely engaged, but I know this could not be correct. Does anybody have any idea what I need to do?




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Ross Pugh(NC)

06-26-2007 07:52:34




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 Re: Carb Trouble in reply to Roper64, 06-25-2007 10:39:40  
By running the chokepartially closed you are making the fuel/ air ratio richer by cutting down on the air flow into the carb throat. Therefore your problem is either fuel starvation or an air leak.



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Ross Pugh(NC)

06-26-2007 07:57:17




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 Re: Carb Trouble /P.S. in reply to Ross Pugh(NC), 06-26-2007 07:52:34  
Also like the others have said, if you have weak spark a richer mixture will help, so weak spark could also be the problem.



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souNdguy

06-25-2007 10:54:43




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 Re: Carb Trouble in reply to Roper64, 06-25-2007 10:39:40  
Classic 'needs choke to run'

1, vacume leak.. could be carb to manifold gasket.. manifold gasket, or carb thgrottle shaft packing. ( could be cracked manifold... )
Choke helps correct a lean mix ( from a vacume leak ), by pulling more fuel to compensate for that extra air.


2, weak sparks.. could be bad wire connections, old wires, coil.. cap.. could be points gap or coroded points.
Choke enrihes the mix and helps weak sparks fire.

3, could be dirt/crud that broke loose inthe fuel system while you swapped out the carb.
Choke increases manifold vacume to help pull fuel thru partially blocked passages and needles..

Soundguy

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Bruce (VA)

06-25-2007 10:49:02




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 Re: Carb Trouble in reply to Roper64, 06-25-2007 10:39:40  
I don't think you got your ignition problems fixed. The choke is giving you a richer mixture to compensate for problems in the ignition circuit. Just what was the problem & what was done to fix it?



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Roper64

06-25-2007 11:31:22




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 Re: Carb Trouble in reply to Bruce (VA), 06-25-2007 10:49:02  
Also, when I did the first tune up, I attempted to make sure the timing was right as shown in the FO4 (front mount dist) I had to move the adjustment all the way down to get it close to what the FO4 shows. Could the dist parts be worn out to have to move this much.



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Bruce (VA)

06-25-2007 14:34:54




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 Re: Carb Trouble in reply to Roper64, 06-25-2007 11:31:22  
Well, the distributor could be worn, but if it ran before & after you set the timing, it doesn't occur to me that timing and/or a worn distributor was the problem.

We need to first speak the same language. When you say it did not crank, that tells me that the engine did not turn over, i.e., you press the starter button and nothing happens. The starter does not crank the engine. But, I believe what you are telling me is that it did not start. It turned over (cranked) but would not start. So, my first question: is that correct?

So, if we assume the engine was indeed turning over, my guess is you 'fixed' some, but not all of the problem w/ the tune up kit. But, and this is what makes it difficult to pin point the precise reason for it needing some choke to run, you have replaced so many parts you may have created a new problem while fixing another. That being the case, here is what I would do:

1. Pull the distributor & re-check the point gap at .015 on all 4 lobes. Slightly stretch the pig tail on the bottom of the coil.

2. Check that each plug wire is firmly in the cap.

3. Pull a plug. What does it look like? Light brown? Black & sooty? All 4 should be light brown. Re-check the gap (.025)

4. Check that each plug boot is firmly on each plug. Are the plug wires ok? Not frayed or cracked? Are you sure they are copper cored? If not, replace them.

5. Remove the wires from the ignition switch & clean the contacts. do the same w/ the wire going to the top of the coil.

Do all of this & re-post if it does not work. And, your problem could be a vacuum leak, trash in the carb or a restricted fuel flow, or an incorrectly adjusted carb, but my personal experience is needing choke to run is an ignition system problem.

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Roper64

06-25-2007 11:27:59




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 Re: Carb Trouble in reply to Bruce (VA), 06-25-2007 10:49:02  
Not sure what was wrong, it would not crank. I put new points, plugs, cap, and coil. I think the points were stuck though. Prior to it not cranking I had put a new carb and it ran, I then put a tune up kit in (points, plugs, cond, and rotor) it wran good, my son hauled it to mow and it would not crank, then I did the above. Also after it would not crank I was checking the fuel system and replaced the fuel cut off and bowl.

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