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9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual

1.89

FUEL SYSTEM DIAGNOSTICS

FUEL SYSTEM TROUBLESHOOTING

FUEL STARVATION / LEAN MIXTURE

SYMPTOMS CAUSES

• Hard start or no start

• Bog

• Backfire

• Popping through Intake / Exhaust

• Hesitation

• Detonation

• Low Power

• Spark plug erosion / fouling

• Engine runs hot

• Surging

• High / Erratic idle

• 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, air box

cover)

• Faulty oxygen sensor

RICH MIXTURE