carb idle

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barbee6043

barbee6043

barbee 6043
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I can't say I have ever had a car do this. I assume a problem in the internal idle.
71 slant points, 2 bbl carter, just stated dong this after 2 years. Starts up, after I have warmed it up ( choke not working), it will try to die, I goose the throttle, it reves up for a second and maintaians that higher idle for a second or so, then it will not keep idling unless I set the idle screw up quite a ways.
I find no vacumm leaks, lash has been set last year, good gas, changed filter. Sprayed carb cleaner down with it running. Cleaned needle and seat. Timing OK.
Any ideas except take apart carb , and clean?
 
I would check throttle shaft play, worn shaft bore and such. In my MG days this problem is an occurring nightmare.....
 
2 years for a set of points and condenser without any problems? Might be time to clean and/or freshen them up
 
barbee6043 said:
I can't say I have ever had a car do this. I assume a problem in the internal idle.
71 slant points, 2 bbl carter, just stated dong this after 2 years. Starts up, after I have warmed it up ( choke not working), it will try to die, I goose the throttle, it reves up for a second and maintaians that higher idle for a second or so, then it will not keep idling unless I set the idle screw up quite a ways.
I find no vacumm leaks, lash has been set last year, good gas, changed filter. Sprayed carb cleaner down with it running. Cleaned needle and seat. Timing OK.
Any ideas except take apart carb , and clean?
Click to expand...

Count the turns it takes to run the mixture screws all the way in, and then remove them completely.
Shoot each hole with something like WD40 and then hit them with compressed air.
Put the mixture screws back where they were and try it again.
(The WD will help carry the junk out that settles in the air bleeds)
This solves that problem most of the time.
 
barbee6043 said:
NO, but don't tell me that ! IT is that leaning side of that leaning sucker!!!
Click to expand...

They are not bad to change at all. I did mine in under 15 minutes. That said, I think it might be a flooding issue. Does it when warm. JMO
 
I think TB nailed it.
The clue is that the idle hesitates high before falling. I'm guessing the throttles are too far up the transfers, cuz you have screwed in the curb-idle screw in compensation for a failed low-speed circuit. Either the emulsion tubes are plugged, the pick-up orifice is, or most likely, the air-bleeds are plugged.
The hanging idle could also indicate sticking flyweights, but follow TB's advice first, it is the more likely cause.
 
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