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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