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An increasing number of snowmobiles are equipped with an air temperature sensor inside the air box. This sensor detects the temperature of the air...

An increasing number of snowmobiles are equipped with an air temperature sensor inside the air box. This sensor detects the temperature of the air entering the engine, providing this important information to the on-board computer for determining outputs for things like proper fuel delivery, ignition timing and power valve positioning.
On very humid or foggy days, the airbox sensor can actually ice up. This can cause the sensor to “think” it is something like 32-degree air, when it can be warmer than that. The moist air, traveling past the sensor at high speeds, coats the sensor and leads to more fuel delivery than needed. If riding in humid air and your sled seems to be sluggish and “fat”, keep this possibility in mind.

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