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My most resent dilemma, what could be the cause of it freezing up?



Baby just needed a scarf!the solution that got me home.

Maybe get the heat riser functional and switch her over to the winter setting!

I found that every now and then at sea level when the humidity is high, with temps around 50-60 my carb Ices up to. it happens 5 to ten minutes after startup. I lose throttle control and when i pop the hood the carb is frosty white. when this happens i run the truck till some heat is showing on the gauge then turn off the truck. I then do a 2-4 minute walk-around(visual inspection with some pulling and kicking)so the carb can heat soak. then I start her back up and go.

the heat riser on Canadian trucks is always on at startup. if there is a fix please share

Mine does the same, you pretty much said it. I just let it continue to warm up. For me it has only occured at the first couple of minutes of running at the first start.

I would toss in some gas line anti freeze ( red bottle of Heet ) and see if it helps some. I run the stuff in my gas powered engines ( chainsaw, snowmobiles, Jeeps) thru the winter. It seems to help get rid of that dreaded condensation in the fuel system when the temps and humidity are just right for forming condensation. Winter setting on the heat riser would help alot too
Paul in Wisconsin

skinnedknuckles wrote:I would toss in some gas line anti freeze ( red bottle of Heet ) and see if it helps some. I run the stuff in my gas powered engines ( chainsaw, snowmobiles, Jeeps) thru the winter. It seems to help get rid of that dreaded condensation in the fuel system when the temps and humidity are just right for forming condensation. Winter setting on the heat riser would help alot too
Paul in Wisconsin

Heet wont fix this problem. Its called Carb icing and piston airplane engines are prone to it and are why they are equipt with carb heat. Adjusting the heat riser is the only true solution. But like I said if your like me, just let it warm up and the radiant heat will warm the carb and it will resolve itself.



Carburetor, or carb icing, is an icing condition which can affect any carburetor under certain atmospheric conditions. Carburetor icing occurs when there is humid air, and the temperature drop in the venturi causes the water vapor to freeze. The ice will form on the surfaces of the carburetor throat, further restricting it. This may increase the Venturi effect initially, but eventually restricts airflow, perhaps even causing a complete blockage of the carburetor. Icing may also cause jamming of the mechanical parts of the carburetor, such as the throttle, typically a butterfly valve.

While it applies to all carburetors, it is of particular concern in association with piston-powered aircraft, especially small, single-engine, light aircraft. Aircraft powered by carbureted engines are equipped with carburetor heat systems to overcome the icing problem. In cars, carburetor icing can occasionally be a nuisance. The inlet manifold and parts of the carburetor often have warm water from the cooling system or exhaust gas circulating through them to combat this problem. Motorcycles can also suffer from carburetor icing, although some engine designs are more susceptible to it than others. Air-cooled engines may be more prone to icing, due to the absence of warm coolant circulating through the engine

Cover the grill with a piece of carboard so the fan isn't pulling out side air past the carb. Watch temp gauge to prevent overheating.