Here are a few thoughts and things to look at or consider.
I have had a few arctic cats over the past 10 years/worked on them quite a bit... IMO and the basic reason that a efi will start at wfo (wide fuckin open) is that cats shut off the gas delivery system when you pull the cord with the throttle at WFO. The reason they do this is so if it is flooded you can shut off the gas and get a flooded sled to start again. You are getting enough air unless something got in the hood and plugged it up or it could be that the rubber piece that elongates when the hood is open and delivers air to your engine is pinched but that is a long shot. Are you running this sled stock?
It does sound like you are getting too much gas or flooding the system. This could be a fuel pump problem - maybe - but I have seen fuel pumps go ou, you may be getting too much pressure in your fuel delivery system - that would be again be due to a faulty fuel pump, or your throttle may not be retracting fast enough - or look to see if your throttle is not returning to "idle" position - that can cause too much gas to get too much gas in the system.
Sometimes if they run too hot the it can cause the throttle can stick a bit and that would put too much fuel into the system. I doubt that it is the injectors as I have almost never seen one go bad but it could happen. If it was a injector and you had to replace it look you will have a o, square, or triangle on the injector and you would need to match it up. Injectors are pricey and I would pry just see if it comes back. If so hold her wfo and it should start again. Also on a sled that new you should get a code flashing on the speedo if it were a injector.
I have had a couple of beers so let me think about this and ask some people and I will get back.
It might have been a one time deal of flooding for some reason but if it comes back post again.
Last it could be that your ecu is telling the system to dump more gas into the system than is needed. For this one you would need a dealer to re-flash your ecu.
jahve
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