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07 sportsman wont run without pumping throttle

overdooinit

By overdooinit
in Polaris ATV Forum

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overdooinit Rookie

overdooinit

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After a rollover and breaking out the Speedo Gauge my machine starts and will not stay running nor will it idle. Speedo is removed as it is non repairable. I can pump the throttle as it is running and that is the only way it will stay running but will not rev up. I can spray gas into air cleaner intake when air cleaner is out and it will rev up. I pulled the injector out and made sure there was gas getting to fuel rail when pump comes on and there is. One person told me you need the Speedo on for it to run fine but I took one off my 800EFI and it still does same thing and the 800 runs fine without the speedo on it. Any advice??? You can not ride machine like this. Like machine isn't getting proper amount of fuel through the injector. I highly doubt injector is bad being only 300 miles in change on the machine. Please don't tell me adjust throttle cable. Any Legit idea's??

BuckBilly Veteran

BuckBilly

Posted
Posted
I tried another guage off 08 800 EFI and does the same thing. The 800 runs fine without guage. I have the whole pod off right now. Looked at wires and nothing is wrong.
Is the throtle cable still hooked up to the throttle positioning sensor?????? That is Throttle body setup, not to hard to knock something out wack. Sounds like the throttle position sensor is bad. That would be the next thing I would check.
Ajmboy Grand Master

Ajmboy

Posted
Posted
Throttle position sensor.Would be my first guess, same set up as a car. I got on Ronnies mail order site and looked at the the diagrams of your EFI. Again my first guess would be throttle position sensor.

Ronnie's Mail Order for atv parts, atv tires, snowmobile, watercraft and motorcycle featuring an OEM microfiche parts finder.

I agree, it sounds like a possible reason, just like on a car. I'm not familiar with the setup on that atv, but I would check that and whatever else there may be that is electrical and controls fuel flow. See if there is a fuel pump relay or injector relay, pressure regulator, etc.

BuckBilly Veteran

BuckBilly

Posted
Posted
TPS is fine. Machine is not getting enough fuel once it starts running. It's like something is cutting the fuel flow. I'm ready to fold.
How did you check the TPS????????????? Polaris has a computor that hooks up and will tell you what the problem is.
  • 2 weeks later...
ATVmechanic Enthusiast

ATVmechanic

Posted
Posted
After a rollover and breaking out the Speedo Gauge my machine starts and will not stay running nor will it idle. Speedo is removed as it is non repairable. I can pump the throttle as it is running and that is the only way it will stay running but will not rev up. I can spray gas into air cleaner intake when air cleaner is out and it will rev up. I pulled the injector out and made sure there was gas getting to fuel rail when pump comes on and there is. One person told me you need the Speedo on for it to run fine but I took one off my 800EFI and it still does same thing and the 800 runs fine without the speedo on it. Any advice??? You can not ride machine like this. Like machine isn't getting proper amount of fuel through the injector. I highly doubt injector is bad being only 300 miles in change on the machine. Please don't tell me adjust throttle cable. Any Legit idea's??

Is yours also an 800? Or is it a 450, 500, or 700...

Sounds like it could be the TPS sensor but as you get higher in CC's you may have some other possible stuff going on.

overdooinit Rookie

overdooinit

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Do you have the operational instructions on performing that test task? If so that would be great. I've never had to test one before so I'm not familiar with it. Sounds like you know what your doing.

ATVmechanic Enthusiast

ATVmechanic

Posted
Posted
Do you have the operational instructions on performing that test task? If so that would be great. I've never had to test one before so I'm not familiar with it. Sounds like you know what your doing.

I'm not sure what that model has, but usually there is a positive wire for power, and another wire sending the voltage back to adjust air fuel mixture, based on throttle position. Check the signal wire voltage for fluctuation while you move the throttle. This should give you an idea if it's working. If it's not and is shorted, it may be signaling for closed throttle.

That has an electric fuel pump. You may want to check fuel pressure or see if the pump is delivering fuel and not just making noise.

overdooinit Rookie

overdooinit

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I checked pressure coming into fuel rail. It's perfect. You can see injector initially spraying fuel looking through throttle body as well, ruling out injector. If you find specifics on TPS testing let me know.

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