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Discussion Starter #1
I have an 07 sportsman 800 efi. Went out today and it started missing. idles ok and when I gas it it usually takes off but sometimes it will miss and give a small back fire. It does it at all rpms. I can let off the throttle and get back into it and it will clear up then do it again. It does it at wide open high speeds and just taking off. I unscrewed the gas cap to make sure it wasn't vapor locking. Where do I look next? Has new plugs and fresh oil.

sent from a locomotive driving ass hole.
 

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Im sure others will know, but i had a Polaris snowmobile with efi that did that and it was because the battery was going bad. Could check battery and charging.
 

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Discussion Starter #3
Hmmmm good to know. I do know it cranks over fine but I'll check the voltage.

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Discussion Starter #5
Mmmmm thought about that but I figured if that was it it wouldn't be so sporadic... guess I could put more fresh gas in.

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tps sensor wiring? they are known to go bad, there is a replacement kit on e-bay with better wires than oem kits.
 

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Discussion Starter #7
I did that already. It got rid of the check engine light. It's not throwing any codes now.

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I would check your owners manual for a gas drain.My 400 Sportsman had similar problems. Located a carburetor drain and drained out a bunch of water. Water being heavier than gas will settle to the lowest point.Just my .02 sents worth, Ken
 

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Discussion Starter #9
Yeah this is true. I'd assume on these efi models it's just a matter of draining the tank. I got a new fuel filter for it too so I'll drain it then.

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Discussion Starter #10
Unfortunately I don't have a manual. I'll have to download one.

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Unfortunately I don't have a manual. I'll have to download one.

sent from a locomotive driving ass hole.
Ebay has a Clymer manual for $35 for your machine. Look for Sixity they are selling them.
 

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I just had a friend that was experiencing something similar. A service Tec told him to open up his throttle assembly and he said there's a safety switch in there that was dirty. He cleaned it up and problem went away.
 

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Discussion Starter #13
If that turns out to be the problem I'm buying you a beer. Somehow...

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Discussion Starter #15
So I cleaned the throttle body today no and adjusted and tested the tps. No change. It still cuts out completely then fires back up as if nothing was wrong. Sometimes it backfires which means fuel loading up.... it has new plugs. Where do I go from here?

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So I cleaned the throttle body today no and adjusted and tested the tps. No change. It still cuts out completely then fires back up as if nothing was wrong. Sometimes it backfires which means fuel loading up.... it has new plugs. Where do I go from here?

sent from a locomotive driving ass hole.
Sir a backfire is the sign of a lean running condition. Their was not enough gas in the cylinder to fire but enough in the exhaust system to be ignited buy the flame from the cylinder.You sound as if you think it is flooding butt I will make a bet the engine is starving for fuel. Ken
 

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Discussion Starter #18
It's cutting out completely like it's maybe losing spark for a second.

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I will stick to my guns and say it is a fuel supply issue. With the key on can you hear the fuel pump running?If not I would check the fuse and see if you are getting power to the pump.Gas line pinched or kinked?When was the gas filter last changed? Hang in their we will get it!!! With the key ON you should have power to the pump.Could be a fuel pressure regulator but lets not jump the gun, Ken
 

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Discussion Starter #20
Yeah I can hear the pump priming every time I turn the key on.

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