General Precautions of EFI System Maintenance
F-110
11 .Slow rotation or flameout when accelerating.
General malfunction Locations: 1. Water-containing Fuel 2. Air Flow Meter and Throttle Opening Sensor; 3.
Spark Plug; 4. Throttle Body and Idling Bypass Air Circuit; 5. Air Intake Passage; 6. Fuel Injector ; 7. Ignition
Timing; 8. Exhaust pipe
General Diagnostic Flow:
S/N Operating Steps Test Result Follow-up Step
1 Inspect whether or not the air filter is blocked.
Yes
Air intake
system to be
inspected and
repaired
No Next Step
2
Link up the fuel pressure gauge (the linking point to be on the
front end of the oil inlet pipe for the fuel rail assembly), start
the engine, and examine whether or not the fuel pressure is at
about 400kPa under the idling speed operating condition.
Remove vacuum tube on fuel pressure regulator, verify
whether pressure is about 450kpa.
Yes Next Step
No
Fuel system to
be inspected and
repaired
3
Inspect spark plugs of respective cylinders, and observe
whether or not their models and clearances are compliant with
specifications.
Yes Next Step
No
To be adjusted
or replaced
4
Inspect whether or not carbon accumulation exists on the
throttle body.
Yes
Related parts
and components
to be cleaned
No Next Step
5
Inspect whether or not the air flow meter, the throttle opening
sensor, and their lines are under normal conditions.
Yes Next Step
No
Line to be
inspected and
repaired or
sensor to be
replaced
6
Demount the fuel injector, and use special cleaning analyzer
for fuel injector to examine whether or not leakage or
blockage exists.
Yes
Fuel injector in
malfunction to
be replaced
No Next Step
7
Inspect the fuel status, and observe whether or not
malfunction symptom is caused just after fuel has been filled.
Yes
Fuel to be
replaced
No Next Step
8
Inspect whether or not the ignition sequence and the ignition
timing of engine is compliant with specifications.
Yes Next Step
No
Ignition timing
to be inspected
and repaired
9
Inspect whether or not the exhaust pipe is able to exhaust air
smoothly.
Yes Next Step
No
Exhaust pipe to
be repaired or
replaced
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