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Farmall & IHC Tractors Discussion Forum
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H is at it again!!!

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49 Cubber!

03-09-2004 15:10:44




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Runs like crap when idleing,put it under a load it runs great.Any clues?




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Chads

03-10-2004 08:46:22




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 Re: H is at it again!!! in reply to 49 Cubber!, 03-09-2004 15:10:44  
I agree with river bend. Check that brass bushing in the throttle shaft. it has 2 holes in it for vacuum passeges in the castng of the carb, and are directly for the idle circuit. the bushing, may have slipped in the bore and blocked the passeges. if that happens, it will run off of the main jet circuit and run rich. Here is a way to test it. idle it down, and lean out the carb with the main jet adjustment. if it smooths out, it is the bushing, or the carb is plugged up in the idle passages. The throttle shaft has a notch cut out in it, when it is idling, the passages are open to allow it to run on the idle side, when the rpm increases, the passages are shut down, and switched to the main load jet. in a way, the idle circuit on the H carb is an early form of a throttle position sensor. Even the idle rpm setting can mess this up too, hope this helps, ChadS

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riverbend

03-09-2004 16:46:10




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 Re: H is at it again!!! in reply to 49 Cubber!, 03-09-2004 15:10:44  
Have you tried the throttle shaft bushing yet ? A greased oring on the shaft helped for a little bit.



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42FarmallH

03-09-2004 16:11:58




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 Re: H is at it again!!! in reply to 49 Cubber!, 03-09-2004 15:10:44  
Sounds like a vaccuum leak to me. Spray WD-40 or carb cleaner around the manifold while it's idling and see if it helps. Or use an UNLIT propane torch around the manifold while running.

Either that or could be gunk in the idle circuit of the carburetor...



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49 Cubber!

03-09-2004 17:34:58




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 Re: Re: H is at it again!!! in reply to 42FarmallH, 03-09-2004 16:11:58  
I checked for a vacumm leak wit hthe propane and with WD40,but no change in the way it ran.I did notice that while it was sitting there idling,it would occasionally shoot a small flame out the pipe,no muffler.I pulled the wires one at a time and #2 was the cause of the flame.I triple checked my timing and pulled the valve cover to check for a sticking valve and all of the valves were moving fine.The flame was intermitin and the only time it stopped is when I pulled the #2 wire.I will check my gaps in the morning when its daylight.

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