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FUEL SYSTEM (DFI) 3-39
DFI System Troubleshooting Guide
Symptoms or Possible C auses Actions (chapter)
Stick coil trouble Inspect (see chapter 16).
Fuel/air mixture incorrect:
Air cleaner clogged, poorly sealed, or missing Clean element or inspect sealing (see chapter 3).
Air cleaner duct loose Reinstall (see chapter 3).
Air cleaner O-ring damaged Replace (see chapter 3).
Water or foreign matter in fuel Change fuel. Inspect and clean fuel system (see
chapter 3).
Throttle body assy loose Reinstall (see chapter 3).
Throttle body assy O-ring damaged Replace (see chapter 3).
Fuel tank air vent obstructed Inspect and repair (see chapter 3).
Fuel line clogged
Inspect and repair (see chapter 3).
Fuel pump operates intermittently and often DFI
fuse blows.
Pump bearings may wear. Replace the pump
(see chapter 3).
Fuel pump trouble
Inspect (see chapter 3).
Inlet air temperature sensor trouble Inspect (see chapter 3).
Main throttle sensor trouble Inspect (see chapter 3).
Atmospheric pressure sensor trouble Inspect (see chapter 3).
Inlet air pressure sensor trouble Inspect (see chapter 3).
Cracked or obstructed inlet air pressure sensor
hose
Inspect and repair or replace (see c hapter 3).
Injector clogged Visually inspect and replace (see chapter 3).
Compression low:
Spark plug loose Reinstall (see chapter 16).
Cylinder head not sufficiently tightened down Tighten (see chapter 5).
No valve clearance Adjust (see chapter 2).
Cylinder, piston worn Inspect and replace (see chapter 5).
Piston ring bad (worn, weak, broken or sticking) Inspect and replace (see chapter 5).
Piston ring /groove clearance excessive Inspect and replace (see chapter 5).
Cylinder head gasket damaged Replace (see chapter 5) .
Cylinder head warped 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 the seating surface)
Inspect and repair or replace (see c hapter 5).
Knocking:
Carbon built up in combustion chamber Repair (see chapter 5).
Fuel poor quality or incorrect (Use the gasoline
recommended in the Owner’s Manual)
Change fuel (see chapter 3).
Spark plug incorrect Replace it with the correct plug (see chapter 16).
Stick coil trouble Inspect (see chapter 16).
IC igniter in ECU trouble Inspect (see chapter 16).
Inlet air temperature sensor trouble Inspect (see chapter 3).
Atmospheric pressure sensor trouble Inspect (see chapter 3).
Miscellaneous:
Subthrottle sensor trouble Inspect (see chapter 3).
Subthrottle valve actuator trouble Inspect (see chapter 3).
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