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 MANUALSFORD1999F 150 2WD PICKUP V6-4.2L VIN 2REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR FLOW METER/SENSORSERVICE AND REPAIR
1999 Ford F 150 2WD Pickup V6-4.2L VIN 2
Air Flow Meter/Sensor: Service and Repair
1999 Ford F 150 2WD Pickup V6-4.2L VIN 2SECTION Service and Repair
REMOVAL
WARNING: DO NOT DISASSEMBLE THE MAF SENSOR. THE SENSOR CAN BE DAMAGED BY TOUCHING.
1. Disconnect the battery ground cable.
2. Open the engine air cleaner.
^ Disconnect the Mass Air Flow (MAF) sensor connector from the wiring harness.
^ Release the air cleaner clamp.
^ Separate the inlet side of the air cleaner from the outlet side of the air cleaner.
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.
CAUTION: Do not cut the MAF sensor wires when cutting the tape on the wire loom.
4. Remove the grommet from the outlet side of the air cleaner and slide the grommet down the extension harness.
5. Remove the MAF sensor plate and mass air flow sensor from the outlet side of the engine air cleaner.
6. Disconnect the MAF sensor connector.
7. Remove the nuts and separate the MAF plate from the mass air flow sensor.
INSTALLATION
1. Follow the removal procedure in reverse order.
CAUTION
^ Do not tamper with the MAF sensing elements located in the airflow bypass; tampering may result in unit failure.
^ 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
^ The MAF sensor module and body are calibrated and replaced as a unit.
^ Use the alignment notch to properly align the inlet side and the outlet side of the engine air cleaner.
WARNING: DO NOT DISASSEMBLE THE MAF SENSOR. THE SENSOR CAN BE DAMAGED BY TOUCHING.
1. Disconnect the battery ground cable.
2. Open the engine air cleaner.
^ Disconnect the Mass Air Flow (MAF) sensor connector from the wiring harness.
^ Release the air cleaner clamp.
^ Separate the inlet side of the air cleaner from the outlet side of the air cleaner.
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.
CAUTION: Do not cut the MAF sensor wires when cutting the tape on the wire loom.
4. Remove the grommet from the outlet side of the air cleaner and slide the grommet down the extension harness.
5. Remove the MAF sensor plate and mass air flow sensor from the outlet side of the engine air cleaner.
6. Disconnect the MAF sensor connector.
7. Remove the nuts and separate the MAF plate from the mass air flow sensor.
INSTALLATION
1. Follow the removal procedure in reverse order.
CAUTION
^ Do not tamper with the MAF sensing elements located in the airflow bypass; tampering may result in unit failure.
^ 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
^ The MAF sensor module and body are calibrated and replaced as a unit.
^ Use the alignment notch to properly align the inlet side and the outlet side of the engine 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.