Sensor/System Checks

Check the following systems for proper operation:

• Exhaust Gas Recirculation (EGR) system. See EXHAUST GAS RECIRCULATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - 4.0L AURORA article.
• Positive Crankcase Ventilation (PCV) system.
• Knock Sensor (KS) system. See KNOCK SENSOR under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - 4.0L AURORA article.