8 Unstable Idle (Rough Idle, Hunting)

Inspection Procedure 8:

Unstable idle (Rough idle, hunting)
- In cases such as the above, the cause is probably that the ignition system, air-fuel mixture, idle air control motor or compression pressure is defective
- Because the range of possible causes is broad, inspection is narrowed down to simple items.

Probable Cause
- Malfunction of the ignition system
- Malfunction of air-fuel ratio control system
- Malfunction of the IAC system
- Malfunction of the evaporative emission purge solenoid system
- Malfunction of the EGR system
- Poor compression
- Drawing air into exhaust system