Page 386 - Manual Oficina Polaris Sportsman 570 2014 a 2016

FUEL SYSTEM

FUEL SYSTEM TROUBLESHOOTING

The correct position of the throttle body stop screw is Symptom: Erratic Idle
established and set at the factory. DO NOT remove the • Throttle cable incorrectly adjusted
tamper proof cap to adjust the throttle body stop screw • Air Leaks, dirty injector
or alter its position in any manner. The stop screw • TPS damaged or mis-adjusted
controls the air flow calibration of the throttle body. • Tight valves
• Belt dragging
FUEL STARVATION / LEAN MIXTURE • Dirty air cleaner
• Engine worn
Symptoms: Hard start or no start, bog, backfire, popping • Spark Plug fouled
through intake / exhaust, hesitation, detonation, low • Throttle stop screw tampering
power, spark plug erosion, engine runs hot, surging, high • Failed sensor or disconnected wiring
idle, idle speed erratic.
• No fuel in tank
• Restricted tank vent, or routed improperly
• Fuel lines or fuel injectors restricted
• Fuel pump inoperative
• Air leak in system
• Intake air leak (throttle shaft, intake boot, gasket or
grommet)
• Failed sensor or disconnected wiring

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 duct)
• Air filter dirty/plugged
• Poor fuel quality (old fuel)
• Fouled spark plug
• TPS setting incorrect
• Injector failure
• Failed sensor or disconnected wiring
• Throttle stop screw tampering

POOR IDLE
Symptom: Idle Too High (If greater than 1300 RPM when
engine is warm)

• Throttle stop screw tampering
• Throttle cable sticking, improperly adjusted, routed
incorrectly
• Failed sensor or disconnected wiring
• IAC stuck or inoperative
• Intake air leak

Symptom: Idle Too Low (if less than 1200 RPM when
engine is warm)
• Dirty throttle body (damaged or improper air filter)
• Plugged air filter
• Leaking injector (rich condition)
• Belt dragging
• Throttle stop screw tampering
• Failed sensor or disconnected wiring

4.70 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.