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4.38
ELECTRONIC FUEL INJECTION
EFI 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 filter plugged
• Fuel pump inoperative
• Air leak in system
• Intake air leak (throttle shaft, intake ducts, airbox or air
cleaner cover)
• Incorrect throttle stop screw 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 duct)
• Air filter dirty/plugged
• Poor fuel quality (old fuel)
• Fouled spark plug
• TPS setting incorrect
• Injector failure
Poor Idle
Symptom:
Idle Too High (If greater than 1300 RPM when
engine is warm).
• Throttle stop screw set incorrect
• Throttle cable sticking, improperly adjusted, routed
incorrectly
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
Symptom:
Erratic Idle.
• Throttle cable incorrectly adjusted
• Air Leaks, dirty injector
• TPS damaged or adjusted
• Tight valves
• Ignition timing incorrect
• Belt dragging
• Dirty air cleaner
• Engine worn
• Spark Plug fouled
• Throttle stop screw set incorrectly (out of sync with
ECU)
Summary of Contents for Ranger RZR SW
Page 4: ......
Page 12: ...1 8 GENERAL INFORMATION SAE Tap Drill Sizes Metric Tap Drill Sizes Decimal Equivalents ...
Page 14: ...NOTES GENERAL INFORMATION 1 10 ...
Page 48: ...NOTES MAINTENANCE 2 34 ...
Page 50: ...3 2 ENGINE ENGINE SPECIFICATIONS Crankcase Exploded Views ...
Page 51: ...3 3 ENGINE 3 Oil Pump Water Pump Engine Cover Exploded View ...
Page 52: ...3 4 ENGINE Stator Cover Starter Water Pump Oil Filter Pressure Relief Exploded View ...
Page 53: ...3 5 ENGINE 3 Cylinder Cylinder Head Piston Exploded View ...
Page 112: ...NOTES ENGINE 3 64 ...
Page 154: ...4 42 ELECTRONIC FUEL INJECTION Digital Wrench Feature Map ...
Page 192: ...NOTES BODY STEERING SUSPENSION 5 34 ...
Page 264: ...NOTES FINAL DRIVE 7 48 ...
Page 284: ...NOTES TRANSMISSION 8 20 ...
Page 324: ...10 18 ELECTRICAL COOLING SYSTEM SCHEMATIC Cooling System Break Out Diagram ...
Page 345: ......
Page 346: ......