[AT] Ford 4000 Quitting Afer Running a While

[Alan Nadeau]

Charlie,  not trying to disagree with you but doesn't a rich mixture light 
easier?  From playing around with economy measures in his cars, back 
during/after the '73 gas crunch, a friend of mine pretty much established 
that a lean mixture required a hotter spark and the inverse was true as 
well.

With that in mind enriching the mixture would let a weakening coil to 
produce enough spark to light that richer mixture.

I'm not much of a fan of diagnosing by throwing parts at a problem but, in 
this case, knowing nothing positive about when this machine last saw service 
I am leaning towards refreshing the ignition system and eliminating that 
from further consideration if the problem persists.

What is the likelihood of an ignition switch developing high resistance and 
lowering voltage to the coil?  If I could reach the switch I would be 
inclined to see if it gets hot after running for a while.  From what I can 
see the only way to reach the switch is to remove the dash panel.   That 
becomes a bit of a big deal for me as I have only partial function in my 
left hand, making it hard to deal with fasteners that are hard to get at.

Where do you check resistance on a coil?  I have a good meter and now I'm 
getting curious about any difference in resistance between cold and hot 
conditions at the coil.

Keep the dialog coming.

Al


----- Original Message ----- 
From: "charlie hill" <charliehill at embarqmail.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, July 14, 2013 12:06 PM
Subject: Re: [AT] Ford 4000 Quitting Afer Running a While


> No doubt a bad coil will cause that problem but if pulling the choke 
> closed
> makes it
> run better it's not the coil.
>
> Charlie
>
> -----Original Message----- 
> From: Greg Hass
> Sent: Saturday, July 13, 2013 11:25 PM
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] Ford 4000 Quitting Afer Running a While
>
> My brother had a gas combine once that did the same thing . Called out a
> mechanic who tried several things over a 4 hour period before replacing
> the coil; problem solved.
>    Greg Hass
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