Mitsubishi 3000GT 1991 Service Manual page 123

PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
Items
Won't start
(no initial combustion)
(Starting takes a long
time.)
Idling instability
(Rough idling)
Incorrect idling speed
Pass out
Hesitation
Poor acceleration
Shock
Surge
Knocking
FUEL SYSTEM
The starter is used to crank the engine, but there is no combustion within the
cylinders, and the engine won't start.
There is combustion within the cylinders, but then the engine soon stalls.
Engine won't start quickly.
Engine speed doesn't remain constant; changes during idling.
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 idling.
The engine doesn't idle at the usual correct speed.
This non-continuity of idling includes the following elements.
. . . . . The engine stalls when the foot is taken from the accelerator pedal,
regardless of whether the vehicle is moving or not.
it is being used.
"Hesitation" is the delay in response
of the vehicle speed (engine rpm) that
occurs when the accelerator pedal is
depressed in order to accelerate from
the speed at which the vehicle is now
traveling, or a temporary drop in vehi-
cle speed (engine rpm) during such
acceleration.
Serious hesitation is called "sag".
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.
Engine rpm response is delayed when
the accelerator pedal is initially
depressed for acceleration from the
stopped condition.
The feeling of a comparatively large impact or vibration when the engine is
accelerated or decelerated.
This is repeated surging ahead during constant speed travel or during variable
speed travel.
A sharp sound a hammer striking the cylinder walls during driving and which
like
adversely affects driving.
TSB Revision
Symptom
Normal
Time
.
Normal
Initial
accelerator
pedal
,
,
Idling
Time
Hesitation
---
,
,
1 FU022:
Stumble
1 FUO22L