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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