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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1991LTD WAGON V8-302 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR FLOW METER/SENSORDESCRIPTION AND OPERATION
1991 Ford LTD Wagon V8-302 5.0L
Air Flow Meter/Sensor: Description and Operation
1991 Ford LTD Wagon V8-302 5.0LSECTION Description and Operation
Mass Air Flow Sensor:
The Mass Air Flow (MAF) sensor, located between the air filter and the throttle body, is used to measure the mass of the air entering the engine due to volumetric displacement.
The MAF sensor operates on the principle that if a mass is maintained at a constant temperature above the ambient environment, then the thermal loss is proportional to the mass flow of the cooling medium it is subjected to.
The electronic module of the MAF sensor heats a wire element to 392°F (200°C) above ambient temperature. As air passes through the sensor, the air cools the wire element. The MAF sensor supplies more power to the wire to keep it at a constant temperature difference. When a drop in power useage occurs, the MAF sends a signal to the Electronic Control Assembly (ECA) indicating the drop. The signal increases with the airflow into the engine.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.