TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-21
Driving
Engine does not revolve up
The engine speed does not increase
even the accelerator pedal is
depressed.
9
Hesitation, sag
The vehicle speed (engine speed)
responds with too much delay when
the accelerator pedal is depressed for
acceleration from a certain vehicle
speed, or the vehicle speed (engine
speed) drops transiently during
acceleration. These phenomena are
called "hesitation" and strong
hesitation is called "sag".
10
Stumble
When starting the vehicle, the engine
speed responds with too much delay
to initial operation of the accelerator
pedal.
Poor acceleration
The engine operates smoothly during
constant-speed driving, but during
acceleration, the rise in speed is
insufficient compared with the one
expected for the degree of throttle
valve opening. In addition, the engine
fails to reach the maximum speed.
Surge
The vehicle jolts longitudinally and
repeatedly during constant-speed
driving or acceleration.
The feeling of impact or vibration
when accelerating
Large impact is felt during
acceleration.
11
The feeling of impact or vibration
when decelerating
Large impact is felt during
deceleration.
12
Knocking
The engine makes a pounding or
clanking noise that would be
generated if a cylinder were
hammered, deteriorating the drive
quality.
13
Ignition timing offset
The basic ignition timing does not
conform to the standard timing.
14
Stopping
Run on (Dieseling)
The engine continues to run even
after the ignition switch is turned to
the LOCK (OFF) position.
15
Exhaust gas
Odor, white smoke, black smoke,
and high concentration of CO/HC
during idling
Exhaust gas smells very nasty,
includes white or black smoke and/or
contains carbon
monoxide/hydrocarbons at high
concentration during idling.
16
Items
Trouble symptom
Inspection
procedure
No.
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