4.43
ELECTRONIC FUEL INJECTION
4
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 - replace throttle body
• 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 - replace throttle body
Poor Idle
Symptom: Idle Too High (If greater than 1300 RPM when
engine is warm)
• Throttle stop screw tampering - replace throttle body
• 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 900 RPM when engine is
warm)
• Plugged air filter
• Leaking injector (rich condition)
• Belt dragging
• Throttle stop screw tampering - replace throttle body
• Failed Sensor or disconnected wiring
Symptom: Erratic Idle
• Throttle cable incorrectly adjusted
• Air Leaks, dirty injector
• TPS damaged or adjusted
• Tight valves
• Belt dragging
• Dirty air cleaner
• Engine worn
• Spark Plug fouled
• Throttle stop screw tampering - replace throttle body
• Failed Sensor or disconnected wiring
The correct position of the throttle body
idle stop is established and set at the
factory. Do not loosen the throttle body
idle stop or alter the stop position in any
fashion. If the stop is repositioned, the
entire throttle body assembly
must be replaced.
Summary of Contents for Ranger 500 2x4 2007
Page 1: ......
Page 20: ...1 18 GENERAL INFORMATION SAE Tap Drill Sizes Metric Tap Drill Sizes Decimal Equivalents ...
Page 82: ...3 23 ENGINE 3 Cylinder Head Exploded View EH50PL EFI Shown A A ...
Page 153: ...4 45 ELECTRONIC FUEL INJECTION 4 Fuel Pump Circuit Ignition Coil Circuit ...
Page 157: ...4 49 ELECTRONIC FUEL INJECTION 4 Diagnostic Connector Circuit ...
Page 296: ...10 10 ELECTRICAL POWER DISTRIBUTION MODULE NON EFI MODELS PDM Operation ...
Page 309: ...10 23 ELECTRICAL 10 EFI Cooling System Break Out Diagram PDM RD WH Key On 12 V Power ...
Page 332: ...10 46 ELECTRICAL Transmission Switch Circuit Differential Solenoid Circuit ...
Page 333: ...10 47 ELECTRICAL 10 Charging System Circuit Cooling Fan Circuit ...
Page 334: ...10 48 ELECTRICAL AWD Circuit ...
Page 339: ...WD 1 WIRE DIAGRAM RANGER 500 2X4 4X4 CHASSIS ...
Page 340: ...WD 2 WIRE DIAGRAM RANGER 500 2X4 4X4 DASH ...
Page 341: ...WD 3 WIRE DIAGRAM RANGER 500 EFI 4X4 CHASSIS PAGE 1 OF 2 ...
Page 342: ...WD 4 WIRE DIAGRAM RANGER 500 EFI 4X4 CHASSIS PAGE 2 OF 2 ...
Page 343: ...WD 5 WIRE DIAGRAM RANGER 500 EFI 4X4 DASH ...
Page 344: ...WD 6 WIRE DIAGRAM RANGER 500 EFI 4X4 BREAKOUTS ...
Page 345: ...WD 7 WIRE DIAGRAM RANGER 500 2X4 4X4 BREAKOUTS ...