Mitsubishi MOTORS Space Runner 1998, Руководство по ремонту

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GDI <4G9> -
Troubleshooting
13B-31
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
Items Symptom
Starting Won’t start The starter is used to crank the engine, but there is no combustion within the
cylinders, and the engine won’t start.
Fires up and dies There is combustion within the cylinders, but then the engine soon stalls.
Hard starting Engine starts after cranking a while.
Idling Hunting Engine speed doesn’t remain constant; changes at idle.
stability
Rough idle Usually, a judgement can be based upon the movement of the tachometer
pointer, and the vibration transmitted to the steering wheel, shift lever, body, etc.
This is called rough idle.
Incorrect idle speed The engine doesn’t idle at the usual correct speed.
Engine stall
(Die out)
The engine stalls when the foot is taken from the accelerator pedal, regardless
of whether the vehicles is moving or not.
Engine stall
(Pass out)
The engine stalls when the accelerator pedal is depressed or while it is being
used.
Driving Hesitation, Sag “Hesitation” is the delay in response
of the vehicle speed (engine speed)
that occurs when the accelerator is
depressed in order to accelerate
from the speed at which the vehicle
is now traveling, or a temporary drop
in vehicle speed (engine speed)
during such acceleration.
Serious hesitation is called “sag”.
Vehicle
speed
Initial ac-
celerator
pedal de-
pression
Normal
Hesitation
Sag
Time
Poor acceleration Poor acceleration is inability to obtain an acceleration corresponding to the
degree of throttle opening, even though acceleration is smooth, or the inability
to reach maximum speed.
Stumble Engine speed increase is delayed
when the accelerator pedal is
initially depressed for accelera-
tion.
Normal
Initial ac-
celerator
pedal de-
pression
Idling
Stumble
Time
Vehicle
speed