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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 l ow 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 l ow 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 l ow 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