Troubleshooting - Fuel System; Fuel System Troubleshooting; 9929375 R02 - 2016-2019 General / General 4 Service Manual - Polaris GENERAL 2016 Service Manual

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TROUBLESHOOTING - FUEL SYSTEM

Fuel Starvation / Lean Mixture

Symptoms: Hard start or no start, bog, backfire, popping

through intake / exhaust, hesitation, detonation, low

power, spark plug erosion, engine runs hot, surging, high

idle, idle speed erratic.

• 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

Rich Mixture

Symptoms: Fouls spark plugs, black, sooty exhaust

smoke, rough idle, poor fuel economy, engine runs

rough/ misses, poor performance, bog, engine loads up,

• Air intake restricted (inspect intake duct)

• Air filter dirty/plugged

• Poor fuel quality (old fuel)

• Fouled spark plug

• Injector failure

Symptom: Idle Too High (if > 1400 RPM when warm).

• Throttle stop screw tampering

• Throttle cable sticking, improperly adjusted, routed

• Faulty electrical connection

Symptom: Idle Too Low (if < 1100 RPM when warm).

• Plugged air filter

• Leaking injector (rich condition)

• Belt dragging

• Throttle stop screw tampering

Symptom: Erratic Idle.

• Throttle cable incorrectly adjusted

• Air Leaks, dirty injector

• TMAP damaged (check with Digital Wrench®)

• Tight valves (low compression or high leakdown)

• Ignition timing incorrect

• Belt dragging

• Dirty air filter

• High percentage of cylinder leakdown (worn engine)

• Low compression (worn engine)

• Spark plug(s) fouled

• Spark plug wires loose or worn

• Faulty electrical connection

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