Improper Idling

Idling stability

Hunting

Engine speed doesn't remain constant; changes at idle.

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 vehicle is moving or not.

Engine stall (Pass out)

The engine stalls when the accelerator pedal is depressed or while it is being used.


- Unstable idle, (Rough idle, hunting)

- Idle speed is high, (Improper idle speed)

- Idle speed is low, (Improper idle speed)