2010 Polaris Sportsman 850 Service Manual, Page 83Get this manual

2010 Polaris Sportsman 850 Service Manual, Page 83

ELECTRONIC FUEL INJECTION FUEL SYSTEM TROUBLESHOOTING The correct position of the throttle body stop screw is established
or misadjusted Tight valves Belt dragging Dirty air cleaner Engine worn Spark Plug fouled Throttle stop screw tampering Failed
sensor or disconnected wiring Fuel StarvationLean Mixture Symptoms: Hard start or no start, bog, backfire, popping through
intakeexhaust, hesitation, detonation, low power, spark plug erosion, engine runs hot, surging, high idle, idle speed erratic
No fuel in tank Restricted tank vent, or routed improperly Fuel lines or fuel injectors restricted Fuel pump inoperative
Air leak in system Intake air leak (throttle shaft, intake boot, gasket or grommet) Throttle stop screw tampering Failed
sensor or disconnected wiring Rich Mixture Symptoms: Fouls spark plugs, black, sooty exhaust smoke, rough idle, poor fuel
economy, engine runs rough misses, poor performance, bog, engine loads up, backfire Air intake restricted (inspect intake