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.
1990 Mercury Grand Marquis LSFACTORY OEM SERVICE PROCEDURE
Vane Airflow Sensor Specifications
VANE AIRFLOW VOLTAGE (2.2L PROBE) (1)
| Vane Door Position | Volts | ||
|---|---|---|---|
| 1/8 | 3.24 | ||
| 2/8 | 5.60 | ||
| 3/8 | 5.62 | ||
| 4/8 | 5.83 | ||
| 5/8 | 6.02 | ||
| 6/8 | 6.57 | ||
| 7/8 | 7.46 | ||
| 8/8 | 7.87 | ||
|
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VANE AIRFLOW VOLTAGE (1.9L ESCORT)
| Airflow m(3)/hr | Volts |
|---|---|
| 9 | 0.80 |
| 16 | 1.35 |
| 26 | 1.85 |
| 40 | 2.25 |
| 60 | 2.65 |
| 100 | 3.15 |
| 160 | 3.60 |
| 240 | 4.0 |
| 380 | 4.5 |
NOTE:
Airflow equals volume of air flowing through VAF meter per hour. As airflow increases, so will output voltage.
Factory Service Tools
Use the Manual With the Right Hardware
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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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