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