Ranger 4WD V6-182 3.0L (1994)
Inlet Air Temperature Control: Pinpoint Tests
AIS 1 Preliminary Checks - Hesitation/Stalls on Acceleration
^ Key OFF, engine OFF.
^ Check that throttle lever is resting on throttle plate stop screw.
^ Key ON, engine RUNNING.
^ Check engine operating temperature and coolant level in overflow reservoir.
^ Check for vacuum leak At intake manifold and hose routings.
^ Check for proper operation of EGR valve.
^ Check for ignition or exhaust malfunction.
^ Check fuel quality (contamination).
^ Are any problems found?
YES -- Service or adjust as necessary. Replace parts as necessary.
NO -- Go to AIS 4. See: AIS 4 Vacuum Motor Check
AIS 2 Preliminary Checks For Lack Of Power
^ Key ON, engine OFF.
^ Check proper belt tension.
^ Check for throttle linkage binding.
^ Key ON, engine RUNNING.
^ Check engine operating temperature and coolant level in overflow reservoir.
^ Check for vacuum leak at intake manifold and hose routings.
^ Check for proper operation of EGR valve.
^ Check for ignition or exhaust malfunction (refer to maintenance schedule).
^ Check for brake drag.
^ Check transmission shift schedule.
^ Are any problems found?
YES -- Service or adjust as necessary. Replace parts as necessary.
NO -- Go to AIS 4. See: AIS 4 Vacuum Motor Check
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.
