12. TROUBLESHOOTING
12-7
Replace.
6. Check fuel level in fuel tank and fuel pressure.
Low or no fuel pressure. Replace defective part(s) refer to FUEL TANK AND FUEL
PUMP.
7. Check CAPS (camshaft position sensor).
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 use new
recommended oil.
Oil contamination due to clogged oil filter/oil strainer. Replace oil and oil filter at the
same time, replace defective part(s).
9. Check valve springs exhaust/intake.
Broken valve spring damages the cylinder head, valve(s), rocker arm(s), piston, piston
rings and connecting rod. Replace defective part(s).
10. Check if fuel supply is sufficient.
Low fuel level.
Clogged fuel filter or fuel injector filter.
Fuel line is contaminated and/or bent. Clean and/or replace defective part(s).
Symptom: ENGINE BACKFIRES
1. Check spark plugs.
Carbon accumulation caused by defective spark plugs. Replace spark plugs.
2. Check leakage on intake manifold.
Air leak on intake system. Retighten screws and/or replace intake manifold gasket.
3. Check exhaust air leaking.
Exhaust gasket is leaking. Retighten screws and/or replace exhaust gasket.
4. Check intake valve(s) for leaking.
Intake valve(s) is (are) leaking. Repair or replace valve(s).
5. Check if fuel supply is sufficient.
Fuel line is contaminated and/or bent (engine gets lean). Clean and/or replace defective
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