9.TROUBLESHOOTING
9-13
Defective sensor/wiring. Refer to ENGINE MANAGEMENT.
Symptom: ENGINE SUDDENLY TURNS OFF
1. Perform engine leak test.
Damaged head gasket and/or seal and/or leaking inlet/exhaust valve(s).
replace and/or repair defective parts.
2. Check spark plugs condition and/or gap.
Fouled spark plugs or wrong spark plug gap. Readjust gap and clean
spark plugs or replace..
3. Piston seizure.
Spark plugs heat range is too hot. Install spark plugs with appropriate
heat range (refer to TECHNICAL SPECIFICATIONS).
Compression ratio is too high. Install genuine parts.
Poor oil quality. Use recommended oil.
Leaks at air intake manifold (engine gets too lean). Retighten screws or
replace air intake manifold gasket.
Snow/water intrusion through intake system into combustion chamber.
Clean intake system and replace defective part(s).
4. Melted and/or perforated piston dome; melted section at ring end gap.
Spark plugs heat range is too hot. Install recommended spark plugs
(refer to TECHNICAL SPECIFICATIONS).
Coolant less than recommended level (engine gets too hot). Repair
cooling circuit and/or refill with recommended liquid.
Poor quality and/or wrong fuel. Clean from contamination and use
appropriate fuel (refer to TECHNICAL SPECIFICATIONS).
5. Piston color is dark due to seizure on intake and exhaust side.
Cooling system leaks and lowers coolant level. Tighten clamps or replace
defective parts. Add antifreeze in cooling system until appropriate level s
reached. Replace damaged parts.
6. Cracked or broken piston.
Cracked or broken piston due to excessive piston/cylinder clearance or
engine overheating. Replace piston. Check piston/cylinder clearance
(refer to CYLINDER AND HEAD).
7. Check piston rings and cylinder surface for grooves.
Poor oil quality. Use recommended oil.
Contamination through engine intake. Replace defective part(s) and use
new air filter.
8. Check crankshaft, rocker arms movement.
Oil pump failure due to lack of oil. Repair and replace defective parts and
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