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 MANUALSPONTIAC1987FIREBIRD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSENSORS AND SWITCHES - COMPUTERS AND CONTROL SYSTEMSAIR FLOW METER/SENSORDESCRIPTION AND OPERATION
1987 Pontiac Firebird V8-350 5.7L
Air Flow Meter/Sensor: Description and Operation
1987 Pontiac Firebird V8-350 5.7LSECTION Description and Operation
The Bosch MAF Sensor is of the hot wire type. Current is supplied to the sensing wire (hot wire) to maintain a calibrated temperature, and as air flow increases or decreases the current will vary. This varying of current causes a voltage drop within the meter circuitry which is directly proportional to the incoming air mass. The ECM supplies a current limiting 5 volt source on the signal line. The MAF sensor draws approximately .4 volts with a low air flow and up to 5 volts with a high air flow (during wide open throttle applications).
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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.