1979 F-150 4x4, 300-6, 4-speed. It's all basically stock, and has the carb with the anti diesel soleniod. I'm experiencing some sticking choke problems. I adjusted the choke (went way lean on the indicators), no difference. Thought maybe after a billion heat cycles the elec choke coil could be tired, replaced it, no change. It seems to always return to the "almost off" setting (idleing at 1200rpms). If I give it a quick high rev, it'll drop down the normal base idle of 750 rpm's. If I tap the accelerator pedal lightly, it returns to the 1200 rpm idle.

Don't know much about these 1V carbs, looking for some help. THANKS !!!

 

No idea's ??

 

last try.............

 

Try posting this question over in the straight 6 forum. Better chance of finding an answer there. As for your problem it might be as easy as tanking the carb and rebuilding it. The linkage might be gummed up too. Try taking some spray carb cleaner and hosing the linkage while moving the components. The fast idle step cam should free fall to the lowest setting with the engine hot.

Ford Inline Six, 200, 250, 4.9L / 300 - Ford Truck Enthusiasts Forums

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THANKS !!!

 

Check the heat tube coming off the Exhaust manifold. They corrode on the end and break off....no heat to choke.

 

Well just played with it some more. Choke linkage moves freeley, throttle linkage moves freeley. The choke is DEFINATELY setting itself every time I depress the throttle. I've got to check one more thing, I dropped the replacement choke coil assembly and the sping fell out. I may of put it back in backwards ??? Only thing that I can think of that is wrong.

This occured to me today, since it seems as though the choke is now working backwards; cold start no choke, warm up and I get choke. I thought the lack of cold choke was due to the LEAN setting of the coil, now I'm thinking maybe I'm wrong. This is not my daily driver, just a beater I drive a couple 4 times a week to my kids baseball practices (NO WAY do I want a foul ball hitting the SVO!!).

 

I think all Ford choke springs are installed in the same direction. Here is one I have from a 4brl. and took a pic of this morning. For reference of the correct spring tang mounting direction. Cold it should close the choke, hot it should be wide open.

 

That is helpful, thanks !

 

Well I'm an idiot LOL !!! I unknowingly installed the choke coil backwards when I put it back in the choke housing. As the truck warmed up, it turned on the choke. Got it turned around and what do you know, the choke turns off