Snowmobile Arctic Cat 2-Stroke (2007 year). Instruction - part 48

 

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Snowmobile Arctic Cat 2-Stroke (2007 year). Instruction - part 48

 

 

2-178

Troubleshooting Engine 

(Carbureted Models)

Problem: Engine Does Not Start (No Spark at Spark Plugs)

Condition

Remedy

1. Ignition switch malfunctioning — not in RUN position

1. Replace ignition switch — turn switch to RUN position

2. Wiring harness shorting — connection poor

2. Repair — connect — replace wiring harness

3. Emergency stop switch knob in DOWN position —

malfunctioning

3. Move knob to UP position — replace throttle switch

4. Throttle/ignition monitor switch adjusted too tight —

malfunctioning

4. Adjust (loosen) throttle cable — replace throttle switch

5. Carburetor safety switches adjusted incorrectly —

malfunctioning

5. Adjust — replace carburetor safety switches

6. Spark plugs fouled — damaged

6. Clean — gap — replace spark plugs

7. Spark-plug caps damaged — leaking — shorting

7. Replace spark-plug caps

8. High tension wires/coil loose — grounded — faulty

8. Service — replace high tension wires/coil

9. CDI unit faulty

9. Replace CDI unit

10. Charge coil (1) faulty

10. Replace coil

11. Charge coil (2) faulty

11. Replace coil

12. Flywheel magnets weak

12. Replace flywheel

13. Flywheel key sheared

13. Replace key

Problem: Engine Does Not Start (No Fuel at Cylinders)

Condition

Remedy

1. Gas tank empty

1. Fill tank

2. Shut-off valve closed 

2. Open shut-off valve

3. Fuel hose broken — pinched

3. Replace — service hose

4. Gas-tank vent — hose obstructed

4. Remove obstruction — replace vent — hose

5. In-line fuel filter obstructed — damaged

5. Remove obstruction — replace in-line fuel filter

6. Fuel pump malfunctioning — faulty

6. Replace — repair — clean fuel pump

7. Impulse hose cracked — broken — pinched — dis-

connected

7. Replace — connect impulse hose

8. Carburetors adjusted incorrectly — dirty — damaged

8. Troubleshoot — clean — replace carburetors

9. Primary compression (crankcase) absent

9. Repair — replace damaged — worn engine compo-

nents

2-179

2

Problem: Engine Overheats

Condition

Remedy

1. Spark plug heat range too hot

1. Install lower heat-range spark plugs

2. Coolant low — absent

2. Add coolant

3. Carburetors adjusted incorrectly — jetted incorrectly

— dirty

3. Troubleshoot — clean carburetors — jet correctly

4. Carburetor-to-cylinder air leak

4. Replace — repair gaskets — intake flanges — service

intake ports

5. Heat exchangers no snow for cooling

5. Select new trail — install ice studs to chew up hard

packed snow and ice

6. Rings/grooves carboned

6. Clean — replace rings — pistons

7. Exhaust ports obstructed

7. Remove obstruction

8. Muffler obstructed

8. Remove obstruction

9. Gas/air mixture incorrect

9. Replace jets — adjust jet needle E-clip position

10. Oil-injection pump malfunctioning — adjusted incor-

rectly

10. Replace — bleed — adjust oil-injection pump

11. Primary compression (crankcase) low — absent

11. Repair — replace damaged — worn engine compo-

nents

12. Ignition timing adjusted incorrectly

12. Time ignition

13. Gasoline octane too low

13. Use 87 minimum octane gasoline

14. Water pump — thermostat damaged — faulty

14. Replace — rebuild water pump — replace thermostat

Problem: Engine Backfires

Condition

Remedy

1. Throttle/ignition monitor switch adjusted incorrectly

1. Adjust throttle cable free-play — service spring

2. Spark plugs fouled — damaged

2. Clean — gap — replace spark plugs

3. Spark plug heat range too hot

3. Install lower heat-range spark plugs

4. High tension wires/coil shorting

4. Service — replace high tension wires/coil

5. Carburetor-to-cylinder air leak

5. Repair — replace gaskets — intake flanges service

intake ports

6. Carburetors adjusted incorrectly — dirty — damaged

— loose

6. Troubleshoot — tighten carburetors

7. Gas/air mixture incorrect — too lean

7. Adjust jetting

8. Oil-injection pump malfunctioning — adjusted incor-

rectly

8. Replace — bleed — adjust oil-injection pump

Problem: Engine Four-Cycles (Floods Excessively)

Condition

Remedy

1. Carburetors adjusted incorrectly — dirty — damaged

1. Troubleshoot — clean carburetors

2. Gas/air mixture incorrect

2. Adjust jetting

3. Oil-injection pump malfunctioning — adjusted incor-

rectly

3. Replace — bleed — adjust oil-injection pump

4. Air-intake silencer obstructed

4. Remove obstruction

2-180

Problem: Engine Stops Gradually

Condition

Remedy

1. In-line fuel filter obstructed — damaged

1. Remove obstruction — replace in-line fuel filter

2. Fuel hose obstructed — broken — pinched

2. Remove obstruction — replace — repair fuel hose

3. Head gasket(s) burned out

3. Replace head gasket(s) — service cylinders — head

4. Cylinder head loosening

4. Tighten cylinder head cap screws

5. Spark plugs loose

5. Tighten spark plugs

6. Impulse hose cracked

6. Replace impulse hose

7. High tension wires/coil faulty

7. Service — replace high tension wires/coil

Problem: Engine Stops Suddenly

Condition

Remedy

1. In-line fuel filter obstructed — damaged

1. Remove obstruction — replace in-line fuel filter

2. Fuel hose obstructed — broken — pinched

2. Remove obstruction — repair — replace fuel hose

3. CDI unit faulty

3. Replace CDI unit

4. Ignition coil faulty

4. Replace ignition coil

5. Charge coil (1) faulty

5. Replace coil

6. Charge coil (2) faulty

6. Replace coil

7. Gas-tank vent — hose obstructed — damaged

7. Remove obstruction — replace vent — hose

8. Engine seized

8. Service engine

9. Throttle/ignition monitor switch faulty — throttle

cable adjusted incorrectly

9. Replace throttle control — adjust throttle cable free-

play — adjust — connect — replace carburetor safety
switches

Problem: Engine Fails to Stop (Continues to Run, Even with All Switches Off)

Condition

Remedy

1. CDI unit shorted to ground

1. Replace CDI unit

2. Main wiring harness four-prong connector discon-

nected

2. Connect four-prong connector

2-181

2

Troubleshooting

Engine

(EFI Models)

Problem: Engine Does Not Start (No Spark at Spark Plugs)

Condition

Remedy

1. Ground connections dirty — loose

1. Check all ground connections — clean and tight

2. Throttle/ignition monitor switch malfunctioning —

ignition switch not on

2. Replace faulty switch — turn switch on

3. Wiring harness shorting — disconnected

3. Repair — replace — connect wiring harness

4. Emergency stop switch in DOWN position — mal-

functioning

4. Move switch to UP position — replace throttle control

5. Throttle/ignition monitor switch malfunctioning

5. Adjust throttle cable tension — replace throttle body

assembly

6. Spark plugs fouled — damaged

6. Clean — replace spark plugs

7. Spark-plug caps damaged — leaking — shorting

7. Replace spark-plug caps

8. High tension leads/coil loose — grounded — faulty

8. Service — replace high tension leads/coil

9. ECU/CCU faulty

9. Replace ECU/CCU

10. Ignition timing sensor faulty

10. Replace sensor

Problem: Engine Does Not Start (No Fuel at Cylinders)

Condition

Remedy

1. Gas tank empty

1. Fill tank

2. Injector dropping resistor faulty

2. Replace dropping resistor

3. Fuel pressure regulator faulty

3. Replace regulator — hose

4. Gasoline contaminated

4. Replace gasoline

5. Fuel pump faulty

5. Service — replace fuel pump — connections — wires

6. Fuel hose broken — pinched

6. Replace — service hose

7. Gas-tank vent — hose obstructed

7. Remove obstruction — replace vent — hose

8. Pick-up valve(s) obstructed — damaged

8. Remove obstruction — replace pick-up valve(s)

9. Primary compression absent

9. Repair — replace damaged — worn engine compo-

nents

10. ECU/CCU faulty

10. Replace ECU/CCU

Problem: Engine Does Not Start (Fuel Does Not Ignite)

Condition

Remedy

1. ECU/CCU LED trouble code

1. Service — replace problem component

2. Spark absent

2. Check for spark — see No Spark at Spark Plugs sub-

section

3. Primary compression low

3. Service engine

4. Secondary compression low

4. Service engine

5. Engine flooded

5. Clear engine (hold throttle full-open)

6. Gasoline contaminated

6. Clean tank and entire fuel system

 

 

 

 

 

 

 

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