2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 136Get this manual
FUEL INJECTION POOR IDLE
Symptom: Idle Too High (If greater than 1300 RPM when engine is warm) Throttle stop screw tamperingreplace throttle body Throttle cable sticking, improperly adjusted, routed incorrectly Failed Sensor or disconnected wiring IAC stuck or inoperative Intake air leak Symptom: Idle Too Low (if less than 900 RPM when engine is warm) Plugged air filter Leaking injector (rich condition) Belt dragging Throttle stop screw tamperingreplace throttle body Failed Sensor or disconnected wiring Symptom: Erratic Idle Throttle cable incorrectly adjusted Air Leaks, dirty injector TPS damaged or adjusted Tight valves Belt dragging Dirty air cleaner Engine worn Spark Plug fouled Throttle stop screw tamperingreplace throttle body Failed Sensor or disconnected wiring