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Poor Engine Performance
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• Dirt in fuel system or fuel is old. Replace fuel with
fresh stabilized fuel. Obtain fuel from another supplier before suspecting
machine problems. Suppliers blend fuels differently and changing suppliers
will generally solve any performance problems
• Fuel blended with alcohol or ether may contribute to
performance problems by causing gum and varnish deposits, especially
if fuel is stored for several weeks or more. Obtain fresh fuel.
• Dirty or faulty injectors, see your John Deere dealer
(X590).
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Engine Will Not Start - No Crank
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• Brake pedal not depressed.
• PTO is engaged.
• Defective brake switch, mower engagement switch, or key
switch.
• Electrical problem - See Electrical Troubleshooting Section
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Engine Cranks But Will Not Start
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• Spark plug wire is loose or disconnected.
• No fuel or improper fuel.
• Plugged fuel filter.
• Dirty or faulty injectors, see your John Deere dealer
(X590).
• Electrical problem - See Electrical Troubleshooting Section
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Engine Is Hard To Start
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• Choke not being used or adjusted incorrectly (X570, X580,
X584).
• Plugged fuel filter.
• Dirty or faulty injectors, see your John Deere dealer
(X590).
• Faulty spark plug.
• Stale or improper fuel.
• Loose or corroded electrical connections.
• Engine oil viscosity.
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Engine Runs Unevenly
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• Engine overheating.
• Loose electrical connections.
• Choke cable sticking (X570, X580, X584).
• Throttle cable sticking.
• Fuel line or fuel filter plugged.
• Stale or dirty fuel.
• Improper fuel.
• Air cleaner element plugged.
• Dirty or faulty injectors, see your John Deere dealer
(X590).
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Engine Misses Under Load
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• Faulty spark plug.
• Stale or dirty fuel.
• Plugged fuel filter.
• Dirty or faulty injectors, see your John Deere dealer
(X590).
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Engine Vapor Locks
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• Fuel tank vent plugged.
• Dirt in fuel filter.
• Cooling/radiator fins or air intake screens plugged.
• Loose hose connection at fuel filter or fuel pump.
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Engine Overheats/Malfunction Indicator Light displaying (X590
only)
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• Cooling/radiator fins or air intake screens plugged.
• Engine oil low or too high.
• Engine operated too long at a slow idle speed.
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Engine Will Not Idle
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• Spark plug not gapped correctly.
• Faulty spark plug.
• Operator raising off the seat.
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Engine Knocks
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• Stale or low octane fuel.
• Engine overloaded.
• Low engine speed.
• Oil level low.
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Engine Stops Or Misses When Operating On Hillsides
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• Fuel tank less than half full of fuel.
• Operator raising off of the seat.
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Engine Backfires
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• Faulty spark plug.
• Operator raising off of the seat.
• Intake or exhaust valves sticking, see your John Deere
dealer.
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Engine Loses Power
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• Engine overheating.
• Too much oil in engine.
• Dirty air cleaner.
• Faulty spark plug.
• Travel speed is too fast for conditions.
• Improper fuel.
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Excessive Fuel Consumption
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• Choke is not fully open (X570, X580, X584).
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Black Exhaust Smoke
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• Air filter is dirty or oil soaked.
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