2009 Polaris Ranger 6x6 700 EFI Owners Manual - Page 114

Engine Pings or Knocks Possible Cause Poor quality or low octane fuel Incorrect ignition timing Incorrect spark plug gap or heat range TROUBLESHOOTING Solution Replace with recommended fuel See your dealer Set gap to specs or replace plugs Engine Runs Irregularly, Stalls or Misfires Possible Cause Fouled or defective spark plugs Worn or defective spark plug wires Incorrect spark plug gap or heat range Loose ignition connections Water present in fuel Low battery voltage Kinked or plugged fuel tank vent line Incorrect fuel Clogged air filter Other mechanical failure Solution Inspect, clean and/or replace spark plugs See your dealer Set gap to specs or replace plugs Check all connections and tighten Replace with new fuel Recharge battery to 12.8 VDC Inspect and replace Replace with recommended fuel Inspect and clean or replace See your dealer Possible Lean Fuel Cause Low or contaminated fuel Low octane fuel Clogged fuel filter Solution Add or change fuel, clean the fuel system Replace with recommended fuel Replace filter Possible Rich Fuel Cause Fuel is very high octane Solution Replace with lower octane fuel 111