Troubleshooting - Polaris Sportsman 700 Efi 2005 Service Manual

TROUBLESHOOTING

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
G
Restricted tank vent, or routed
G
improperly
Fuel lines or fuel injectors restricted
G
Fuel filter plugged
G
Fuel pump inoperative
G
Air leak in system
G
Intake air leak (throttle shaft, intake
G
ducts, airbox or air cleaner cover)
Incorrect throttle stop screw
G
adjustment
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, backfire.
Air intake restricted (inspect intake
G
duct)
Air filter dirty/plugged
G
Poor fuel quality (old fuel)
G
Fouled spark plug
G
TPS setting incorrect
G
Injector failure
G
FUEL SYSTEM / FUEL INJECTION
POOR IDLE
Idle Too High (If greater than 1300 RPM when
engine is warm)
Throttle stop screw set incorrect
G
Throttle cable sticking, improperly
G
adjusted, routed incorrectly
Idle Too Low (If less than 900 RPM when engine
is warm)
Plugged air filter
G
Leaking injector (rich condition)
G
Belt dragging
G
Throttle stop screw set incorrect
G
Erratic Idle
Throttle cable incorrectly adjusted
G
Air leaks, dirty injector
G
TPS damaged or adjusted
G
incorrectly
Tight valves
G
Ignition timing incorrect
G
Belt dragging
G
Dirty air cleaner
G
Engine worn
G
Spark plug fouled
G
Throttle stop screw set incorrectly
G
(out of sync with ECU)
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