3.50
ENGINE
TROUBLESHOOTING
Engine
Engine Turns Over But Fails to Start
• No fuel
• Dirt in fuel line or filter
• Fuel will not pass through fuel valve
• Fuel pump inoperative/restricted
• Tank vent plugged
• Carb starter circuit
• Engine flooded
• Low compression (high cylinder leakage)
• No spark (Spark plug fouled)
Engine Does Not Turn Over
• Dead battery
• Starter motor does not turn
• Engine seized, rusted, or mechanical failure
Engine Runs But Will Not Idle
• Restricted carburetor pilot system
• Carburetor misadjusted
• Choke not adjusted properly
• Low compression
• Crankcase breather restricted
Engine Idles But Will Not Rev Up
• Spark plug fouled/weak spark
• Broken throttle cable
• Obstruction in air intake
• Air box removed (reinstall all intake components)
• Incorrect or restricted carburetor jetting
• ETC switch limiting speed
• Reverse speed limiter limiting speed
• Carburetor vacuum slide sticking/diaphragm damaged
• Incorrect ignition timing
• Restricted exhaust system
Engine Has Low Power
• Spark plug fouled
• Cylinder, piston, ring, or valve wear or damage (check
compression)
• PVT not operating properly
• Restricted exhaust muffler
• Carburetor vacuum slide sticking/diaphragm damaged
• Dirty carburetor
Piston Failure - Scoring
• Lack of lubrication
• Dirt entering engine through cracks in air filter or ducts
• Engine oil dirty or contaminated
Excessive Smoke and Carbon Buildup
• Excessive piston-to-cylinder clearance
• Wet sumping
• Worn rings, piston, or cylinder
• Worn valves, guides or seals
• Restricted breather
• Air filter dirty or contaminated
Low Compression
• Decompressor stuck
• Cylinder head gasket leak
• No valve clearance or incorrectly adjusted
• Cylinder or piston worn
• Piston rings worn, leaking, broken, or sticking
• Bent valve or stuck valve
• Valve spring broken or weak
• Valve not seating properly (bent or carbon accumulated
on sealing surface)
• Rocker arm sticking
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 ...