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.
1985 BMW 735i AutomaticFACTORY OEM SERVICE PROCEDURE
Test 9: Air Flow Sensor
- Warm engine to operating temperature. Check that the sensor is properly installed and firmly seated. Ensure sensor plate moves freely. Pull back rubber covering airflow sensor connector. Turn ignition on.
- Ensure 5 volts is present at Gray/White wire. If not, check related circuits. Measure voltage at Gray/White wire. With airflow meter flap closed, it should measure about one volt. As airflow meter flap is moved to wide open, it should steadily increase to 4.5 volts. If not, replace airflow meter.
Factory Service Tools
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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.
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