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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR FLOW METER/SENSORDESCRIPTION AND OPERATION
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Air Flow Meter/Sensor: Description and Operation
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Description and Operation
Fig. 15 Air flow meter:
Intake air flow is measured by the air flow sensor. It is located in the intake passage between the air filter and intake manifold, and informs the ECU of the rate of air flow. A measuring flap swings in the airstream against the pressure of a spring, and is connected to a potentiometer.
The potentiometer transmits the measuring flap position to the ECU, which then uses this information to determine engine load. The air flow meter also controls fuel pump operation and idling. An adjustable idle air by-pass is used to regulate air/fuel mixture at low engine speeds.
Incorporated into the air flow sensor is the air temperature sensor. This sensor informs the ECU of the ambient temperature of the incoming air.
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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.