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 MANUALSPONTIAC1991SUNBIRD BASE, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESENSOR RANGE CHARTSENGINE CONTROLS - SENSOR OPERATING RANGE CHARTSSENSOR RANGE CHARTS
1991 Pontiac Sunbird Base, 4D Sedan, Standard
Sensor Range Charts
1991 Pontiac Sunbird Base, 4D Sedan, StandardSECTION Sensor Range Charts
COOLANT TEMPERATURE RESISTANCE VALUES (1)
| Temperature - °F (°C) | Ohms | ||
|---|---|---|---|
| 210 (100) | 185 | ||
| 160 (70) | 450 | ||
| 100 (38) | 1800 | ||
| 70 (20) | 3400 | ||
| 20 (-7) | 13,500 | ||
| 0 (-18) | 25,000 | ||
| -40 (-40) | 100,700 | ||
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MAP SENSOR VOLTAGE RANGE (1)
| Altitude - Feet | Volts | ||
|---|---|---|---|
| Below 1000 | 3.8-5.5 | ||
| 1000-2000 | 3.6-5.3 | ||
| 2000-3000 | 3.5-5.1 | ||
| 3000-4000 | 3.3-5.0 | ||
| 4000-5000 | 3.2-4.8 | ||
| 5000-6000 | 3.0-4.6 | ||
| 6000-7000 | 2.9-4.5 | ||
| 7000-8000 | 2.8-4.3 | ||
| 8000-9000 | 2.6-4.2 | ||
| 9000-10,000 | 2.5-4.0 | ||
|
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MANIFOLD AIR TEMPERATURE SENSOR RESISTANCE VALUES (1)
| Temperature - °F (°C) | Ohms | ||
|---|---|---|---|
| 210 (100) | 185 | ||
| 160 (70) | 450 | ||
| 100 (38) | 1800 | ||
| 70 (20) | 3400 | ||
| 40 (4) | 7500 | ||
| 20 (-7) | 13,500 | ||
| 0 (-18) | 25,000 | ||
| -40 (-40) | 100,700 | ||
|
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OIL TEMPERATURE SENSOR RESISTANCE TEST (CORVETTE) (1)
| Temperature - °F (°C) | Ohms | ||
|---|---|---|---|
| 210 (100) | 185 | ||
| 160 (70) | 450 | ||
| 100 (38) | 1800 | ||
| 70 (20) | 3400 | ||
| 40 (4) | 7500 | ||
| 20 (-7) | 13,500 | ||
| 0 (-18) | 25,000 | ||
| -40 (-40) | 100,700 | ||
|
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OXYGEN SENSOR VOLTAGE TEST (1)
| Condition | Volts | ||
|---|---|---|---|
| Lean | .1 | ||
| Rich | .9 | ||
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PRESSURE SENSOR VOLTAGE RANGE (1)
| Altitude - Feet | Volts | ||
|---|---|---|---|
| Below 1000 | 3.8-5.5 | ||
| 1000-2000 | 3.6-5.3 | ||
| 2000-3000 | 3.5-5.1 | ||
| 3000-4000 | 3.3-5.0 | ||
| 4000-5000 | 3.2-4.8 | ||
| 5000-6000 | 3.0-4.6 | ||
| 6000-7000 | 2.9-4.5 | ||
| 7000-8000 | 2.8-4.3 | ||
| 8000-9000 | 2.6-4.2 | ||
| 9000-10,000 | 2.5-4.0 | ||
|
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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.