2007 Polaris Sportsman 700/800/800 X2 EFI Service Manual, Page 136Get this manual
FUEL INJECTION EFI Troubleshooting
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 filter plugged Fuel pump inoperative Air leak in system Intake air leak (throttle shaft, intake ducts, airbox or air cleaner cover) Incorrect throttle stop screw adjustment 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 duct) Air filter dirtyplugged Poor fuel quality (old fuel) Fouled spark plug TPS setting incorrect Injector failure Poor Idle Symptom: Idle Too High (If greater than 1300 RPM when engine is warm) Throttle stop screw set incorrect Throttle cable sticking, improperly adjusted, routed incorrectly 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 tampering Symptom: Erratic Idle Throttle cable incorrectly adjusted Air Leaks, dirty injector TPS damaged or adjusted Tight valves Ignition timing incorrect Belt dragging Dirty air cleaner Engine worn Spark Plug fouled Throttle stop screw set incorrectly (out of sync with ECU)