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 MANUALSPONTIAC1990FIREBIRD FORMULA, 5.0 F, AUTOMATIC, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESPECIFICATIONSENGINE CONTROLS - SPECIFICATIONS - V8FUEL SYSTEMTHROTTLE POSITION SENSOR (TPS)

1990 Pontiac Firebird Formula, 5.0 F, Automatic, 4L60/MD8

Throttle Position Sensor (TPS)

1990 Pontiac Firebird Formula, 5.0 F, Automatic, 4L60/MD8SECTION Throttle Position Sensor (TPS)

NOTE: On 4-cylinder models, TPS is not adjustable. For further testing, refer to SELF-DIAGNOSTICS article in this section.

TPS ADJUSTMENT VOLTAGE

Application

⁽¹⁾ Voltage

4.5L (VIN 3)

.48-.53

5.0L (VIN E & F)

⁽²⁾

5.0L (VIN Y)

.40

5.7L (VIN 7)

.50

5.7L (VIN 8)

⁽²⁾

⁽¹⁾	At idle RPM.

⁽²⁾	Not adjustable.

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.