2007 Polaris Ranger 500 4x4 Owners Manual - Page 112

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 Incorrect jetting Solution Add or change fuel, clean the fuel system Replace with recommended fuel Replace filter See your dealer Possible Rich Fuel Cause Overuse of choke Fuel is very high octane Incorrect jetting Solution Inspect, clean and/or replace spark plug Replace with lower octane fuel See your dealer 109