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FUEL SYSTEM (DFI) 3-35
DFI System Troubleshooting Guide
Symptoms or possible Causes Actions (chapter)
Cylinder head warped Inspect and replace (see chapter 5).
No valve clearance
Adjust (see chapter 2).
Valve guide worn Inspect and replace (see chapter 5).
Valve spring broken or weak Inspect and replace (see chapter 5).
Valve not seating properly (valve bent, worn or
carbon accumulating on seating surface)
Inspect and repair or replace (see c hapter 5).
Poor Running at Low Speed
Symptoms or Possible C auses Actions (chapter)
Spark weak:
Battery voltage low
Inspect and charge (see chapter 16).
Spark plug dirty, broken or gap maladjusted Replace (see chapter 2).
Spark plug cap trouble Inspect the stick coil (see chapter 16).
Spark plug cap shorted or not in good contact Reinstall or inspect stick coil (see chapter 16).
Spark plug incorrect Replace it with the correct plug (see chapter 16).
IC igniter in ECU trouble Inspect (see chapter 16).
Crankshaft sensor trouble Inspect (see chapter 16).
Stick coil trouble Inspect (see chapter 16).
Fuel/air mixture incorrect:
Little fuel in tank Supply fuel (see Owner’s Manual).
Air cleaner clogged, poorly sealed, or missing Clean element or inspect sealing (see chapter
2, 3).
Air cleaner duct loose Reinstall (see chapter 3).
Air cleaner O-ring damaged Replace (see chapter 3).
Fuel tank air vent obstructed Inspect and repair (see chapter 3).
Throttle body assy loose
Reinstall (see chapter 3).
Throttle body assy O-ring damage Replace (see chapter 3).
Fuel filter or pump screen clogged Inspect and replace fuel pump (see chapter 3).
Fuel pressure regulator clogged Inspect fuel pressure and replace fuel pump (see
chapter 3).
Fuel line clogged Inspect and repair (see chapter 3).
Inlet air pressure sensor trouble Inspect (see chapter 3).
Inlet air temperature sensor trouble Inspect (see chapter 3).
Thermostat trouble Inspect and replace (see chapter 4).
Unstable (rough) idling:
Fuel injector trouble
Inspect (see chapter 3).
Main throttle sensor trouble Inspect (see chapter 3).
Crankshaft sensor trouble Inspect (see chapter 3).
Throttle valves not synchronizing Inspect (see chapter 2).
Inlet air temperature sensor trouble Inspect (see chapter 3).
Water temperature sensor trouble
Inspect (see chapter 3).
Atmospheric pressure sensor trouble
Inspect (see chapter 3).
Fuel pressure too low or too high Inspect (see chapter 3).
Battery voltage low Inspect and charge (see chapter 16).
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