AIS 3 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 (refer to maintenance schedule).

^ Are any problems found?

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

NO -- Go to AIS 4. AIS 4 Vacuum Motor Check