Diagnosis By Symptom - Mitsubishi

Fig 1:

Fig 2:

SYMPTOMS
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". (Refer to Fig. 1)

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 acceleration. (Refer to Fig. 2)

Shock
The feeling of a comparatively large impact or vibration when the engine is accelerated or decelerated.

Surge
This is slight acceleration and deceleration feel usually at steady, light throttle cruise. Most notable under light loads.

Knocking
A sharp sound like a hammer striking the cylinder walls during driving and which adversely affects driving.