Snowmobile Arctic Cat (2008 year). Manual - part 63

2-190

Problem: Engine Overheats

Condition

Remedy

1. Spark plug heat range too hot

2. Coolant low — absent

3. Carburetors adjusted incorrectly — jetted incorrectly

— dirty

4. Carburetor-to-cylinder air leak

5. Heat exchangers no snow for cooling

6. Rings/grooves carboned

7. Exhaust ports obstructed

8. Muffler obstructed

9. Gas/air mixture incorrect

10. Oil-injection pump malfunctioning — adjusted incor-

rectly

11. Primary compression (crankcase) low — absent

12. Ignition timing adjusted incorrectly

13. Gasoline octane too low

14. Water pump — thermostat damaged — faulty

1. Install lower heat-range spark plugs

2. Add coolant

3. Troubleshoot — clean carburetors — jet correctly

4. Replace — repair gaskets — intake flanges — service

intake ports

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

packed snow and ice

6. Clean — replace rings — pistons

7. Remove obstruction

8. Remove obstruction

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

10. Replace — bleed — adjust oil-injection pump

11. Repair — replace damaged — worn engine compo-

nents

12. Time ignition

13. Use 87 minimum octane gasoline

14. Replace — rebuild water pump — replace thermostat

Problem: Engine Backfires

Condition

Remedy

1. Throttle/ignition monitor switch adjusted incorrectly

2. Spark plugs fouled — damaged

3. Spark plug heat range too hot

4. High tension wires/coil shorting

5. Carburetor-to-cylinder air leak

6. Carburetors adjusted incorrectly — dirty — damaged

— loose

7. Gas/air mixture incorrect — too lean

8. Oil-injection pump malfunctioning — adjusted incor-

rectly

1. Adjust throttle cable free-play — service spring

2. Clean — gap — replace spark plugs

3. Install lower heat-range spark plugs

4. Service — replace high tension wires/coil

5. Repair — replace gaskets — intake flanges service

intake ports

6. Troubleshoot — tighten carburetors

7. Adjust jetting

8. Replace — bleed — adjust oil-injection pump

Problem: Engine Four-Cycles (Floods Excessively)

Condition

Remedy

1. Carburetors adjusted incorrectly — dirty — damaged

2. Gas/air mixture incorrect

3. Oil-injection pump malfunctioning — adjusted incor-

rectly

4. Air-intake silencer obstructed

1. Troubleshoot — clean carburetors

2. Adjust jetting

3. Replace — bleed — adjust oil-injection pump

4. Remove obstruction

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2

Problem: Engine Stops Gradually

Condition

Remedy

1. In-line fuel filter obstructed — damaged

2. Fuel hose obstructed — broken — pinched

3. Head gasket(s) burned out

4. Cylinder head loosening

5. Spark plugs loose

6. Impulse hose cracked

7. High tension wires/coil faulty

1. Remove obstruction — replace in-line fuel filter

2. Remove obstruction — replace — repair fuel hose

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

4. Tighten cylinder head cap screws

5. Tighten spark plugs

6. Replace impulse hose

7. Service — replace high tension wires/coil

Problem: Engine Stops Suddenly

Condition

Remedy

1. In-line fuel filter obstructed — damaged

2. Fuel hose obstructed — broken — pinched

3. CDI unit faulty

4. Ignition coil faulty

5. Charge coil (1) faulty

6. Charge coil (2) faulty

7. Gas-tank vent — hose obstructed — damaged

8. Engine seized

9. Throttle/ignition monitor switch faulty — throttle

cable adjusted incorrectly

1. Remove obstruction — replace in-line fuel filter

2. Remove obstruction — repair — replace fuel hose

3. Replace CDI unit

4. Replace ignition coil

5. Replace coil

6. Replace coil

7. Remove obstruction — replace vent — hose

8. Service engine

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

2. Main wiring harness four-prong connector discon-

nected

1. Replace CDI unit

2. Connect four-prong connector

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Troubleshooting

Engine

(EFI Models)

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

Condition

Remedy

1. Ground connections dirty — loose

2. Throttle/ignition monitor switch malfunctioning —

ignition switch not on

3. Wiring harness shorting — disconnected

4. Emergency stop switch in DOWN position — 

malfunctioning

5. Throttle/ignition monitor switch malfunctioning

6. Spark plugs fouled — damaged

7. Spark-plug caps damaged — leaking — shorting

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

9. ECU/CCU faulty

10. Ignition timing sensor faulty

1. Check all ground connections — clean and tight

2. Replace faulty switch — turn switch on

3. Repair — replace — connect wiring harness

4. Move switch to UP position — replace throttle control

5. Adjust throttle cable tension — replace throttle body

assembly

6. Clean — replace spark plugs

7. Replace spark-plug caps

8. Service — replace high tension leads/coil

9. Replace ECU/CCU

10. Replace sensor

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

Condition

Remedy

1. Gas tank empty

2. Injector dropping resistor faulty

3. Fuel pressure regulator faulty

4. Check valve faulty

5. Fuel pump faulty

6. Fuel hose broken — pinched

7. Gas-tank vent — hose obstructed

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

9. Primary compression absent

10. ECU/CCU faulty

1. Fill tank

2. Replace dropping resistor

3. Replace regulator — hose

4. Replace check valve

5. Service — replace fuel pump — connections — wires

6. Replace — service hose

7. Remove obstruction — replace vent — hose

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

9. Repair — replace damaged — worn engine compo-

nents

10. Replace ECU/CCU

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

Condition

Remedy

1. ECU/CCU LED trouble code

2. Spark absent

3. Gasoline contaminated

4. Primary compression low

5. Secondary compression low

6. Engine flooded

7. Gasoline contaminated

1. Service — replace problem component

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

section

3. Replace gasoline

4. Service engine

5. Service engine

6. Clear engine (hold throttle full-open)

7. Clean tank and entire fuel system

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2

Problem: Engine Does Not Idle

Condition

Remedy

1. ECU/CCU LED trouble code

2. Throttle position sensor idle adjustment incorrect

3. Injector(s) faulty

4. Fuel pressure regulator faulty

5. Air-intake silencer obstructed

1. Service — replace problem component

2. Adjust idle RPM to specifications

3. Replace injector(s)

4. Replace regulator — hose

5. Clean air-intake silencer

Problem: Engine Loses Power or Runs on One Cylinder

Condition

Remedy

1. Sensor faulty

2. Spark plug fouled

3. External coil faulty

4. Gas tank vent — hose obstructed

5. Secondary compression low

6. Fuel pressure regulator faulty

7. Pick-up valve(s) obstructed — out of position

8. Oil-injection pump malfunctioning — adjusted incor-

rectly

9. Throttle bodies out of synchronization

10. Injector faulty

11. Dropping resistor faulty

1. Check LED for trouble code — repair — replace prob-

lem circuit or sensor

2. Replace spark plugs

3. Service — replace coil

4. Service — replace vent hose

5. Service engine

6. Replace regulator

7. Replace — relocate pick-up valve(s)

8. Replace — bleed — adjust oil-injection pump

9. Replace throttle bodies from a similar engine — if prob-

lem is corrected, replace the original assembly

10. Replace injector

11. Test resistor — replace as necessary

Problem: Engine Overheats

Condition

Remedy

1. Spark plug heat range too hot

2. Coolant low — absent

3. Heat exchanger obstructed

4. Intake flange to cylinder air leak

5. Drive system (drive clutch — driven pulley — track

— drive belt) adjusted incorrectly — worn — damaged

6. Rings/grooves carboned

7. Exhaust ports obstructed

8. Expansion chamber obstructed

9. Oil-injection pump malfunctioning — adjusted incor-

rectly

10. Primary compression low — absent

11. Gasoline octane too low

12. Water pump — thermostat damaged — faulty

1. Install lower heat-range spark plugs

2. Add coolant

3. Remove obstruction

4. Replace — seal intake flange(s)

5. Troubleshoot — adjust drive system

6. Clean — replace rings — pistons

7. Remove obstruction

8. Remove obstruction

9. Replace — bleed — adjust oil-injection pump

10. Repair — replace damaged — worn engine compo-

nents

11. Use 87 minimum octane gasoline

12. Replace water pump — thermostat