07 sportsman 800 efi - Polaris ATV Forum
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post #1 of 28 (permalink) Old 08-08-2019, 05:09 AM Thread Starter
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07 sportsman 800 efi idle issue and shutting off

still fighting the low speed hesitation and shutting off on this machine. when you gi start 1st thing of the day it idles around 1250 rpm. as the day goes on the idle continues to drop untill it gets to 950 rpm then the machine will randomly just shut off. it always starts right back up and anything above 1/4 throttle is fine. i have replace throttle body, tps, tps harness, tbap, tbap harness, installed new plugs,plug wires, battery. i got the tbap and tps sensors and harness from otb. i had a terrible time adjusting the tps. if i backed the idle screw all the way out,unhooked throttle cable i could not achieve the base voltage required in the service manual. i open the hole on the tps so i could get voltages in spec and the machine still did the same thing. i emailed otb and was told i shouldn't have touched the idle screw. he said he never does it that way because he could never get it to work. he said to bolt the tps on and adjust until it idles good. so i bought another tps and a used throttle body the still had the yellow glue blocking the idle screw so i knew it had never been turned. installed a new tps which still could not achieve the proper voltage , but adjusted untill it idled good and locked it down. still same issue. i dont know if a oem polaris tps would yeld different results. fuel pressure is at 40psi. compleatly stumped. i have chased all tbap and tps wires all the way to pcm and have no problems. i have to be over looking somthing but can figure it out. any ideas. PLEASE HELP

Last edited by SAINT1000; 08-08-2019 at 05:33 AM.
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post #2 of 28 (permalink) Old 08-08-2019, 07:58 AM
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Wow!!! So me I would be interested in two things. DC voltage at the battery with the machine running at 3,000rpm. Also the condition of the stator wires, both leads the one from the wire harness and the ones attached to the stator directly.

2011 Sportsman® 800 EFI
GURU front brush guard
GURU rear brush guard
Polaris front lock n ride cargo box
Polaris rear rack extender
Warn RT 3.0 winch w/amsteel synthetic line
Viper aluminum haus fairlead
Polaris front spring adjusters
Ricochet a-arm guards
Ricochet full frame skid plate
ITP T-7 beadlock 14" w/OMF inner rim guards
Maxxis big horn 2.0 26x9 front
Maxxis big horn 2.0 26x11 rear
QSC clutch kit
EPI HD springs front n rear
ODI rogue 130mm grips
Ultraseal commercial grade tire sealant (front)
Highlifter tire sealant (rear)
CTEK 3300 battery maintainer
added 7 zerks
beefed up wiring harness
OGIO rear bag
ROTOPAX 1gal. + 2gal. gasoline can
Jccapri bushing kit
Kolpin Over Fenders
Rigid Industries E-Series 10" flood
Walker Evans struts
NGK Iridium's (2,500 miles on Champion's and they looked great!)
Odyssey Extreme battery PC545

2018 Sportsman® 570-T
2019 Aluma® A8818
2020 Outlander® 1000R XXC (on order, ETA mid-Sept)
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post #3 of 28 (permalink) Old 08-08-2019, 10:12 AM Thread Starter
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Ill have to check stator wires but voltage at 3000 rpm is 14.2 volts
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post #4 of 28 (permalink) Old 08-08-2019, 12:46 PM
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Voltage sounds good. I know it may sound a little if course but with all you have done I'm leaning toward a wiring/voltage issue. If those check out it may be time to swap ECM's with a known good one. But I'm really leaning toward bad wires somewhere!!!

2011 Sportsman® 800 EFI
GURU front brush guard
GURU rear brush guard
Polaris front lock n ride cargo box
Polaris rear rack extender
Warn RT 3.0 winch w/amsteel synthetic line
Viper aluminum haus fairlead
Polaris front spring adjusters
Ricochet a-arm guards
Ricochet full frame skid plate
ITP T-7 beadlock 14" w/OMF inner rim guards
Maxxis big horn 2.0 26x9 front
Maxxis big horn 2.0 26x11 rear
QSC clutch kit
EPI HD springs front n rear
ODI rogue 130mm grips
Ultraseal commercial grade tire sealant (front)
Highlifter tire sealant (rear)
CTEK 3300 battery maintainer
added 7 zerks
beefed up wiring harness
OGIO rear bag
ROTOPAX 1gal. + 2gal. gasoline can
Jccapri bushing kit
Kolpin Over Fenders
Rigid Industries E-Series 10" flood
Walker Evans struts
NGK Iridium's (2,500 miles on Champion's and they looked great!)
Odyssey Extreme battery PC545

2018 Sportsman® 570-T
2019 Aluma® A8818
2020 Outlander® 1000R XXC (on order, ETA mid-Sept)
bp405 is online now  
post #5 of 28 (permalink) Old 08-10-2019, 03:36 PM Thread Starter
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One thing I noticed is the rpm reading on the dash doesn't seem to match the motor. I can watch the tach Jump 200 to 300 rpm with no notice in the sound of the engine. Possibly a crank sensor issue? Here is a you tube link

https://youtu.be/_nswJXu4m2M
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post #6 of 28 (permalink) Old 08-10-2019, 04:23 PM
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Interesting point, there are no codes for a bad CS not are there any electrical readings that can be done to them.

2011 Sportsman® 800 EFI
GURU front brush guard
GURU rear brush guard
Polaris front lock n ride cargo box
Polaris rear rack extender
Warn RT 3.0 winch w/amsteel synthetic line
Viper aluminum haus fairlead
Polaris front spring adjusters
Ricochet a-arm guards
Ricochet full frame skid plate
ITP T-7 beadlock 14" w/OMF inner rim guards
Maxxis big horn 2.0 26x9 front
Maxxis big horn 2.0 26x11 rear
QSC clutch kit
EPI HD springs front n rear
ODI rogue 130mm grips
Ultraseal commercial grade tire sealant (front)
Highlifter tire sealant (rear)
CTEK 3300 battery maintainer
added 7 zerks
beefed up wiring harness
OGIO rear bag
ROTOPAX 1gal. + 2gal. gasoline can
Jccapri bushing kit
Kolpin Over Fenders
Rigid Industries E-Series 10" flood
Walker Evans struts
NGK Iridium's (2,500 miles on Champion's and they looked great!)
Odyssey Extreme battery PC545

2018 Sportsman® 570-T
2019 Aluma® A8818
2020 Outlander® 1000R XXC (on order, ETA mid-Sept)
bp405 is online now  
post #7 of 28 (permalink) Old 08-10-2019, 04:26 PM
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Location: New York
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Ok was that jump on warm up??? Because it looks like at the end of the vid it settled at 1170/80. That's were it wants to be, idling between 1150-1250. Of course in that range but at a constant idle rpm.

2011 Sportsman® 800 EFI
GURU front brush guard
GURU rear brush guard
Polaris front lock n ride cargo box
Polaris rear rack extender
Warn RT 3.0 winch w/amsteel synthetic line
Viper aluminum haus fairlead
Polaris front spring adjusters
Ricochet a-arm guards
Ricochet full frame skid plate
ITP T-7 beadlock 14" w/OMF inner rim guards
Maxxis big horn 2.0 26x9 front
Maxxis big horn 2.0 26x11 rear
QSC clutch kit
EPI HD springs front n rear
ODI rogue 130mm grips
Ultraseal commercial grade tire sealant (front)
Highlifter tire sealant (rear)
CTEK 3300 battery maintainer
added 7 zerks
beefed up wiring harness
OGIO rear bag
ROTOPAX 1gal. + 2gal. gasoline can
Jccapri bushing kit
Kolpin Over Fenders
Rigid Industries E-Series 10" flood
Walker Evans struts
NGK Iridium's (2,500 miles on Champion's and they looked great!)
Odyssey Extreme battery PC545

2018 Sportsman® 570-T
2019 Aluma® A8818
2020 Outlander® 1000R XXC (on order, ETA mid-Sept)
bp405 is online now  
post #8 of 28 (permalink) Old 08-10-2019, 05:25 PM Thread Starter
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No, right after the video it dropped back down 950 to 850. Is it just me or is the engine really not changing rpm. I have a timing pick up for my multi meter which will allow it to read rpm, I'll have to grab that from work tomorrow and check to see if it matches the tax
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post #9 of 28 (permalink) Old 08-12-2019, 04:12 AM Thread Starter
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So i played around with ityesterday and couldnt get it to act up. the tach still started off at 1250 rpms then would start reading 950 but it never did the rough idle and shutting off. seems like it only does it when it is hot outside. this thing is killing me
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post #10 of 28 (permalink) Old 08-12-2019, 09:53 AM
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My 2010 HO has the RPM all over the place. With headlights off i get one rpm reading that, although the engine speed increases, the tach does not, past 1450 rpm. With low beams i get a better number but gauge to engine speed is still off a bit but close. Hi Beams seems to be the best reading up and down the rpm scale. I have yet to figure it out so, i am watching this one. If i find a solution first i will post too
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