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 MANUALSPONTIAC1991GRAND PRIX GT, 3.4 X, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESPECIFICATIONSENGINE CONTROLS - SPECIFICATIONS - V6FUEL SYSTEMTHROTTLE POSITION SENSOR (TPS)
1991 Pontiac Grand Prix GT, 3.4 X, Automatic
Throttle Position Sensor (TPS)
1991 Pontiac Grand Prix GT, 3.4 X, AutomaticSECTION Throttle Position Sensor (TPS)
NOTE:
For further testing, refer to appropriate G - TESTS W/ CODES article in this section.
TPS ADJUSTMENT VOLTAGE
| Application | (1) Volts | |||||
|---|---|---|---|---|---|---|
| 3.1L (VIN T) | ||||||
| "A" & "J" Body | (2) .29-4.8 | |||||
| All Others | (2) .50-4.8 | |||||
| 3.3L (VIN N) | .33-.46 | |||||
| 3.4L (VIN X) | (2) .50-4.8 | |||||
| 3.8L (VIN C & L) | .33-.46 | |||||
|
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RENDER: 1.0x
NO RELATED
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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.