Idling and Shifting Problem - Polaris ATV Forum
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post #1 of 6 (permalink) Old 07-03-2011, 08:40 AM Thread Starter
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Idling and Shifting Problem

I have a 2008 800 that began idling too fast. When you start it the RPMs continue to increase without even touching the throttle. As soon as this started it became impossible to shift into gear. I can shut off the engine, shift it into any gear and start the engine. If I start it in Park it won't shift into any other gear. If I start it in forward or reverse, I can't shit into any other gear. When I start it in Reverse or High, it is running way too fast and I'm sure would damange the motor. Any ideas on what might be causing this would be appreciated.
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post #2 of 6 (permalink) Old 07-03-2011, 08:47 AM
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Have you tried setting the idle if you can? also check the adjustment on the trottle maybe wacking your idle settting....Muddie49

2009 Polaris 500 HO
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post #3 of 6 (permalink) Old 07-03-2011, 08:50 AM
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I am going to guess: either the temperature sensor for the engine coolant is giving the computer bad data, and/or the TPS (Throttle position sensor) is either faulty or out of calibration.

The high rpms are causing the clutches to spin, which WOULD make it hard to shift. Lower the rpms and it should shift fine.

(You have fuel injection, and not a carburetor)

Were there any changes to anything around about the time that the high idle started? Anything in the repair history that would be significant?

2007 Sportsman 800
1500 miles, mostly at Hatfield-McCoy trails, WVa.

Last edited by WalterS; 07-03-2011 at 08:56 AM.
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post #4 of 6 (permalink) Old 07-03-2011, 09:30 AM Thread Starter
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It is fuel injected. I can't think of any changes. I haven't ridden it in about a month. The last time it ran fine. The temperature was in the low 90s yesterday. It started out with no problems, but after about 5 minutes the high idling and not being able to shift it started.
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post #5 of 6 (permalink) Old 07-03-2011, 02:07 PM
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tps sensor bad or may just need to set tps, need special tools to do it, it tells how in serviice manual
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post #6 of 6 (permalink) Old 07-19-2011, 02:23 PM
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Other things to check is crack in the boot that goes to the throttle body or the throttle body itself. I had a faulty throttle body from the factory. Replaced it and no problems since.
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