Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1999EXPEDITION 2WD V8-4.6L SOHC VIN 6REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR FLOW METER/SENSORSERVICE AND REPAIR
1999 Ford Expedition 2WD V8-4.6L SOHC VIN 6
Air Flow Meter/Sensor: Service and Repair
1999 Ford Expedition 2WD V8-4.6L SOHC VIN 6SECTION Service and Repair
REMOVAL
1. Disconnect the battery ground cable.
2. Open the air cleaner.
^ Disconnect the mass air flow sensor extension harness connector from the wiring harness.
^ Release the air cleaner clamp.
^ Separate the inlet side of the Air Cleaner (ACL) from the outlet side of the air cleaner.
CAUTION: Do not tamper with the sensing elements located in the mass air flow sensor. Tampering may result in unit failure.
NOTE: The mass air flow sensor module and body are calibrated and serviced as a unit.
3. Cut the tape on the wire loom of the extension harness.
^ Peel back the wire loom from the extension harness near the grommet in the air cleaner.
4. Remove the grommet from the outlet side of the air cleaner and slide the grommet down the extension harness.
5. Remove the mass air flow sensor plate and Mass Air Flow (MAF) sensor from the outlet side of the air cleaner.
6. Disconnect the mass air flow sensor electrical connector from the extension harness.
7. Separate the mass air flow sensor plate from the mass air flow sensor
^ Remove the nuts from the mass air flow sensor plate.
INSTALLATION
1. To install, reverse the removal procedure.
CAUTION: The grommet used to seal the engine air cleaner housing at the extension harness must be fully seated. Failure to do so will result in unmetered air entering the engine.
NOTE: Use the alignment notch to properly align the inlet side and the outlet side of the air cleaner.
1. Disconnect the battery ground cable.
2. Open the air cleaner.
^ Disconnect the mass air flow sensor extension harness connector from the wiring harness.
^ Release the air cleaner clamp.
^ Separate the inlet side of the Air Cleaner (ACL) from the outlet side of the air cleaner.
CAUTION: Do not tamper with the sensing elements located in the mass air flow sensor. Tampering may result in unit failure.
NOTE: The mass air flow sensor module and body are calibrated and serviced as a unit.
3. Cut the tape on the wire loom of the extension harness.
^ Peel back the wire loom from the extension harness near the grommet in the air cleaner.
4. Remove the grommet from the outlet side of the air cleaner and slide the grommet down the extension harness.
5. Remove the mass air flow sensor plate and Mass Air Flow (MAF) sensor from the outlet side of the air cleaner.
6. Disconnect the mass air flow sensor electrical connector from the extension harness.
7. Separate the mass air flow sensor plate from the mass air flow sensor
^ Remove the nuts from the mass air flow sensor plate.
INSTALLATION
1. To install, reverse the removal procedure.
CAUTION: The grommet used to seal the engine air cleaner housing at the extension harness must be fully seated. Failure to do so will result in unmetered air entering the engine.
NOTE: Use the alignment notch to properly align the inlet side and the outlet side of the air cleaner.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.