3.28
ELECTRONIC FUEL INJECTION
FUEL SYSTEM 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
• 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)
• 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
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.
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Summary of Contents for 2009 Sportsman XP 850
Page 10: ...NOTES GENERAL INFORMATION 1 10 P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 44: ...NOTES MAINTENANCE 2 34 P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 148: ...5 56 ENGINE Balance Shaft Timing P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 154: ...NOTES ENGINE 5 62 P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 202: ...NOTES CLUTCHING PVT 7 30 P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 256: ...NOTES BODY FRAME 9 10 P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 323: ...12 31 ELECTRICAL 12 Instrument Cluster Circuit P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 327: ...12 35 ELECTRICAL 12 Battery Charging Circuits P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 329: ...12 37 ELECTRICAL 12 Constant Power Circuits P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 335: ...12 43 ELECTRICAL 12 Engine Start Command Circuits P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 338: ...12 46 ELECTRICAL AWD ADC Circuits P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 341: ...12 49 ELECTRICAL 12 Radiator Fan Circuit P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 343: ...12 51 ELECTRICAL 12 Gear Selector Switch Circuit P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 356: ...WD 20 WIRE DIAGRAM 2009 SPORTSMAN XP 850 INTL EFI P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 358: ...WD 24 WIRE DIAGRAM 2009 SPORTSMAN XP 850 INTL EPS P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 367: ...WD 5 WIRE DIAGRAM 2009 SPORTSMAN XP 850 AWD ADC P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 374: ...WD 19 WIRE DIAGRAM 2009 SPORTSMAN XP 850 EFI P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 376: ...WD 23 WIRE DIAGRAM 2009 SPORTSMAN XP 850 EPS P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...