Polaris Ranger 800 EFI Owner's Manual page 105

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
Incorrect fuel
Clogged air filter
Other mechanical failure
Possible Lean Fuel Cause
Low or contaminated fuel
Low octane fuel
Possible Rich Fuel Cause
Fuel is very high octane
Engine Stops or Loses Power
Possible Cause
Out of fuel
Water is present in fuel
Fouled or defective spark plugs
Worn or defective spark plug wires
Incorrect spark plug gap or heat range
Loose ignition connections
Low battery voltage
Incorrect fuel
Clogged air filter
Other mechanical failure
Overheated engine
TROUBLESHOOTING
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
Replace with recommended fuel
Inspect and clean or replace
See your dealer
Solution
Add or change fuel, clean the fuel system
Replace with recommended fuel
Solution
Replace with lower octane fuel
Solution
Refuel
Replace with new fuel
Inspect, clean and/or replace spark plug
See your dealer
Set gap to specs or replace plug
Check all connections and tighten
Recharge the battery to 12.8 VDC
Replace with fresh recommended fuel
Inspect and clean or replace
See your dealer
Clean radiator screen and core, clean engine exterior,
see your dealer
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