AIS3 - Preliminary Checks For Poor Fuel Economy

- Key Off. Engine Off.

- Check for contaminated Idle Air Control (IAC) valve or proper sealing around valve.

- Check PCV system (incorrect specifications or clogged).

- Key On, Engine Running.

- Check engine operating temperature and coolant level in overflow reservoir.

- Check for ignition or exhaust malfunction.

- Are any problems found?

YES -- Service or adjust as necessary. Replace parts as necessary.

NO -- Go to AIS4. AIS4 - Air Filter Check