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Dies when cold?

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Old Aug 21, 2009 | 07:01 PM
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Dies when cold?

78 F250, 400 C6. Truck runs fine when warm, when cold-first 5 minutes, anything more that the faintest pedal stalls the truck. Starts right back up. The choke seems to be working. Anything I can check?
 
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Old Aug 21, 2009 | 08:38 PM
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Vacuum leaks?
 
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Old Aug 21, 2009 | 10:31 PM
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Sounds like a Motorcraft 2100/2150 2 barrel, yes or no?

Josh
 
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Old Aug 21, 2009 | 11:42 PM
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No vacuum leaks, yes Moto 2150 2 barrel.
 
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Old Aug 22, 2009 | 12:40 AM
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What all have you tried/ done to the carb?

From my point of view it sounds like either the choke is misadjusted or the idle mixture screws are too lean.

Does you engine have the vacuum advance delay valves?

Josh
 
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Old Aug 22, 2009 | 11:31 AM
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I have not done anything to it. Yes, it has the valves. The choke works as far as it runs the rpms up while it's cold, but even with the higher rpms, the slightest tap chokes the motor.
 
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Old Aug 22, 2009 | 02:42 PM
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Have you actually observed the choke plate closed when the engine is cold? (under 70 degrees or so of course)

There are two linkages, one goes to the choke plate and the other goes to the fast idle cam. So the fast idle can operate when the choke plate is disconnected.

Josh
 
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Old Aug 22, 2009 | 03:06 PM
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Originally Posted by berry1234
I have not done anything to it. Yes, it has the valves. The choke works as far as it runs the rpms up while it's cold, but even with the higher rpms, the slightest tap chokes the motor.
Like Bullitt said have you visually verified the chokes operation?
 
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Old Aug 23, 2009 | 10:36 AM
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Yes, plate is closed when cold. After 5 minutes or so the problem slowly get better-I can give it more gas before it stumbles.
 
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Old Aug 23, 2009 | 06:02 PM
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At this point I'd get a vacuum gauge on it and see what the needle does while it runs cold.
 
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Old Aug 24, 2009 | 10:39 AM
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Will do. .
 
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