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Polaris 850 XP EPS Forest FUEL SYSTEM TROUBLESHOOTING

Polaris  850 XP EPS Forest FUEL SYSTEM TROUBLESHOOTING

The correct position of the throttle body stop screw is established and set at the factory. DO NOT remove the tamper proof cap to adjust the throttle body stop screw or alter its position in any manner. The stop screw controls the air flow calibration of the throttle body.

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 pump inoperative
• Air leak in system
• Intake air leak (throttle shaft, intake boot, gasket or  grommet)
• Throttle stop screw tampering
• 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 1400 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 1100 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

Symptom: Erratic Idle

• Throttle cable incorrectly adjusted
• Air Leaks, dirty injector
• TPS damaged or misadjusted
• Tight valves
• Belt dragging
• Dirty air cleaner
• Engine worn
• Spark Plug fouled
• Throttle stop screw tampering
• Failed sensor or disconnected wiring

 

 

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