Kawasaki STX-15F service manual Poor Running or No Power at High Speed

APPENDIX 16-33

Troubleshooting Guide

Fuel line clogged

Inlet air pressure sensor trouble Inlet air temperature sensor trouble

Engine stalls easily

Fuel pump trouble Fuel injector trouble Throttle sensor trouble Camshaft position sensor trouble Fuel pressure too low or too high Inlet air pressure sensor trouble Water temperature sensor trouble Inlet air temperature sensor trouble Fuel line clogged

Crankshaft sensor trouble Ignition coil 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 warped

Cylinder head gasket damaged Valve spring broken or weak

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

Hesitation

Too low fuel pressure Clogged fuel line Fuel pump trouble Fuel injector trouble

Inlet air temperature sensor trouble Throttle sensor trouble

Water temperature sensor trouble Inlet air pressure sensor trouble Loose injector connectors Crankshaft sensor trouble Ignition coil trouble

Loose terminal of battery (–) lead or engine ground lead

Poor acceleration Too low fuel pressure

Water or foreign matter in fuel Clogged fuel filter or pump screen Fuel pump trouble

Fuel injector trouble

Inlet air temperature sensor trouble Water temperature sensor trouble Ignition coil trouble

Engine oil level to high

Spark plug dirty, broken or gap maladjusted

Stumble

Too low fuel pressure

Fuel injector trouble

Throttle sensor malfunction

Water temperature sensor trouble

Inlet air pressure sensor trouble

Surge

Unstable fuel pressure

Fuel injector trouble

Water temperature sensor trouble

Backfiring when deceleration

Spark plug dirty, broken or gap maladjusted Too low fuel pressure

Fuel pump trouble Throttle sensor trouble

Inlet air temperature sensor trouble Water temperature sensor trouble Inlet air pressure sensor trouble Air suction valve trouble

After fire

Crankshaft sensor trouble

Spark plug burned or gap maladjusted Inlet air temperature sensor trouble Water temperature sensor trouble Inlet air pressure sensor trouble Fuel injector trouble

Run-on (dieseling) Ignition switch trouble Engine switch trouble Fuel injector trouble

Loose terminal of battery (–) lead or ECU ground lead

Carbon accumulating on valve seating sur- face

Engine overheating

Other

IC igniter in ECU trouble Engine oil viscosity too high Air suction valve trouble Engine overheating

Intermittent any DFI fault and its recovery

Poor Running or No Power at High Speed

Firing incorrect

Spark plug dirty, broken, or maladjusted Ignition coil shorted or not in good contact Ignition coil trouble

Spark plug incorrect Spark plug cap trouble

Spark plug cap shorted not in good contact Camshaft position trouble

IC igniter in ECU trouble Crankshaft sensor trouble

Fuel/air mixture incorrect Air filter poorly sealed Air filter O-ring damaged Inlet air duct loose

Water or foreign matter in fuel