Choke Action

[nucklhead13]

I got a 78 Scottsdale 1/2 ton four wheeler with a 350, and it's been real hard to start in this cold weather. My guess was that the choke wasn't fully engaged, and I was instructed to try that B-12 carb cleaner.

I did that today and the truck started and idled fine while it was cold, but with the air filter off, while cleaning it I couldn't help noticing that the choke wouldn't really stay open or closed.

I can't help thinking it should stay solidly open when it warms up just like the choke does on a carb with the hand controll. I'm even betting that having it still choke a bit is why it seams to chug down gas real quickly when I drive it over 45.

Can anyone tell me how that choke is really supposed to act so I can make sure I'm not fludding the engine and messing it up?

[pedrofixlater]

when the engine is cold the choke plate on top of the carb will close tight if you hit the gas pedal before you start the engine as the engine warms up you will see the plate open. If you have a tach when its cold and the choke is on it should idle at about 950.

[TrainD5115]

could be that the choke pulloff is bad or just the connecting rod may need to be bent slightly to make an adjustment.

[KShortell]

Do you have an electric choke? You could have a bad oil pressure switch cutting out power to the choke. Of course, this should light up your "Choke" light on the dash, but it wouldn't if the bulb is burnt out or something.

Just a thought...