Kawasaki STX-15F service manual Overheating, Over Cooling, Abnormal Engine Noise

16-34 APPENDIX

Troubleshooting Guide

Fuel to injector insufficient (DFI) Fuel tank air vent obstructed Fuel line clogged

Fuel pump trouble (DFI) Injector clogged Throttle body assy loose

Throttle body assy gasket damaged Fuel line clogged

Fuel pump operates intermittently Inlet air temperature sensor trouble Throttle sensor trouble

Inlet air pressure sensor trouble

Compression low

Spark plug loose

Cylinder head not sufficiently tightened down

No valve clearance Cylinder, piston worn

Piston ring bad (worn, weak, broken, or sticking)

Piston ring/groove clearance excessive Cylinder head gasket damaged Cylinder head warped

Valve spring broken or weak

Valve not seating properly (valve bent, worn, or carbon accumulation on the seating surface.)

Knocking

Carbon built up in combustion chamber Fuel poor quality or incorrect

Spark plug incorrect

IC igniter in ECU trouble Camshaft position sensor trouble Crankshaft sensor trouble Ignition coil trouble

Inlet air temperature sensor trouble

Miscellaneous

Throttle valve won’t fully open

Engine overheating

Engine oil level too high

Engine oil viscosity too high

Air suction valve trouble

Camshaft cam worn

Overheating

Firing incorrect

Spark plug dirty, broken, or maladjusted Spark plug incorrect

IC igniter in ECU trouble

Fuel/air mixture incorrect

Inlet air duct loose

Air filter poorly sealed

Air filter O-ring damaged

Compression high

Carbon built up in combustion chamber

Engine load faulty Engine oil level too high

Engine oil viscosity too high

Lubrication inadequate

Engine oil level too low

Engine oil poor quality or incorrect

Oil cooler incorrect

Oil cooler clogged

Sensor incorrect

Water temperature sensor broken

Over Cooling

Sensor incorrect

Water temperature sensor broken

Abnormal Engine Noise

Knocking

IC igniter in ECU trouble

Carbon built up in combustion chamber Fuel poor quality or incorrect

Spark plug incorrect Overheating

Piston slap

Cylinder/piston clearance excessive Cylinder, piston worn Connecting rod bent

Piston pin, piston pin hole worn

Valve noise

Valve clearance incorrect

Valve spring broken or weak

Camshaft bearing worn

Valve lifter worn

Other noise

Connecting rod small end clearance exces- sive

Connecting rod big end clearance exces- sive

Piston ring/groove clearance excessive Piston ring worn, broken, or stuck Piston ring groove worn

Piston seizure, damage Cylinder head gasket leaking Crankshaft runout excessive Engine mount loose Crankshaft bearing worn Camshaft chain tensioner trouble Camshaft chain, sprocket, guide worn Air suction valve damaged Magneto flywheel loose

Oil Pressure Warning Light Goes On

Oil pump damaged

Oil screen clogged

Oil filter clogged

Engine oil level too low

Engine oil viscosity too low

Camshaft bearing worn

Crankshaft bearing worn