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1. Loosen the air cleaner outlet tube clamp at the Mass Air Flow (MAF) sensor and remove tube. 2. Disconnect the MAF sensor electrical connector. 3. Remove the engine air cleaner cover. 1 Unclip the two bail clamps. 2 Remove the engine air cleaner cover. 4. Remove the Air Cleaner element (ACL element). 1998 Ford Truck Explorer 2WD V6-245 4.0L VIN X SFI 5. Remove the lower air cleaner assembly. INSTALLATION 1. Follow the removal procedure in reverse order.

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REMOVAL- UPPER 1. Disconnect negative cable from battery remote jumper terminal. 2. Disconnect Inlet Air Temperature (IAT) Sensor connector. Remove air inlet resonator and inlet tube. 3. Remove throttle cable and speed control cable from throttle arm and bracket. 4. Remove throttle cable bracket. 5. Disconnect electrical connectors from the following components: – Manifold Absolute Pressure (MAP) Sensor – Throttle Position Sensor (TPS) Sensor – Idle Air Control (IAC) Motor 6. Disconnect Vapor Purge hose, Brake Booster hose, Speed Control Servo, Positive Crankcase Ventilation (PCV) hose (Fig. 104). 7. Loosen upper fastener at throttle body support bracket 9. Remove upper manifold (Fig. 105). 10. Inspect manifold. INSPECTION Check manifold for: – Damage and cracks – Gasket surface damage or warpage – Damaged or clogged EGR ports

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P1128 DESCRIPTION The air/fuel control system, in addition to a number of sensors, includes the following components and systems: – Intake air system. – Exhaust system. – Evaporative emissions control system (includes purge control solenoid valve). – Fuel injectors. – Fuel pressure regulator. – Fuel pump. For the air/fuel ratio to be within limits, all of the sensors, components and systems associated with the air/fuel control system must function within normal parameters. FAILURE CONDITIONS (FOR LONG-TERM FUEL TRIM) The ECM will set a code and the Malfunction Indicator Lamp (MIL) will turn on if the long-term fuel trim value goes to 10% to 15% lean for 30 seconds during two driving cycles when the following conditions are met: 1. Engine load exceeds 1.8 milliseconds. 2. Engine coolant temperature is above 158 °F (70 °C). 3. Canister purge system is not operating. 4. Mass air flow is less than or 5.5 g/s. 5. Engine speed is below 1000 RPM.

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1. Remove the sail panel. NOTE: Release the top portion first. 2. Remove the window regulator switch plate. 3. Disconnect the electrical connectors. 4. Remove the top door trim panel screw. 2001 Ford Truck Expedition 2WD V8-4.6L SOHC VIN W 5. Remove the door trim panel screw at the window regulator switch plate opening. 6. Remove the door trim panel screw in the courtesy lamp housing. 1 Remove the courtesy lamp lens. 2 Remove the screw. 7. Release the inside door handle trim cover. ^ Pull the inside door handle outward. ^ Release the trim cover. 8. Remove the inside door handle. ^ Remove the bolt.9. Lift upward and then outward to remove the front door trim panel. CAUTION: To avoid damage to the front door trim panel, do not pull directly outward. 10. Remove the courtesy lamp. ^ Turn the courtesy lamp bulb socket one-quarter of a turn and remove. 11. Disconnect the power mirror electrical connector. INSTALLATION

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Remove the battery cover. Ensure that all electrical loads are switched OFF and that the engine is cool. Start the engine and allow to IDLE. Whilst the engine is idling, disconnect the battery negative terminal and, using a digital multimeter (DMM), measure the voltage between the terminal on the battery negative cable and the battery positive terminal. If the generator is working, the measured voltage should be within the range 13 V to 15 V. This indicates the system voltage without the battery in circuit. If the generator is inoperative, the engine will stall when the ground lead is disconnected. Repeat the test, using the ground bolt, as indicated (shown dotted on the illustration). There should be hardly any detectable difference in the voltage reading (due to minimal current flow); if there is a detectable difference, clean the cable terminal and the adjacent area of the body. When the voltage has been measured, STOP THE ENGINE. Reconnect the battery or fit a new battery if it was established that the battery was at fault. See: Battery/Service and Repair If the cooling fans operate during the above test, the large demand of current will overload the generator and cause the engine to stall. If the battery is in a low state of charge the voltage will rise momentarily when the battery is disconnected. However, the maximum that the voltage can increase to with this new generator is 25 V and then only for a maximum time of 200 mS.