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 MANUALSBUICK1998RIVIERAREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE ADJUSTMENTSTHROTTLE POSITION (TP) SENSOR

1998 Buick Riviera

Throttle Position (TP) Sensor

1998 Buick RivieraSECTION Throttle Position (TP) Sensor

NOTE: Ensure TP sensor voltage is as specified. See TP SENSOR VOLTAGE table. TP sensor is not adjustable. For further testing procedures, refer to TESTS W/CODES article.

TP SENSOR VOLTAGE

Application

⁽¹⁾ Volts

3.8L

⁽²⁾

⁽¹⁾	Voltage range is from idle position to wide open throttle position.

⁽²⁾	Voltage range is less than one volt at closed throttle to greater than 4 volts at wide open throttle.

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.