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 MANUALSBUICK1991CENTURY L4-151 2.5L VIN R TBIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORSERVICE AND REPAIR
1991 Buick Century L4-151 2.5L VIN R TBI
Throttle Position Sensor: Service and Repair
1991 Buick Century L4-151 2.5L VIN R TBISECTION Service and Repair
Model 700 TBI - Exploded View:
Throttle Position Sensor:
REMOVAL:
1. Disconnect the electrical connector.
2. Remove TPS attaching screws.
3. Remove the TPS.
CAUTION: The TPS is an electrical component and must not be soaked in any liquid cleaner or solvent, as damage may result.
INSTALLATION:
1. With the throttle valve in the closed position, install the TPS on the throttle shaft. Rotate counter clockwise to align mounting holes.
2. Install the TPS attaching screws, finger tighten only.
3. Tighten attaching screws to 2.0 N-m (18 lb. in.)
4. Check TPS voltage:
a. Connect a scan tool to the ALDL connector.
b. Turn the ignition switch ON.
c. Select TPS voltage display on the scan tool, and check voltage. The TPS voltage should be less than 1.25 volts. If the reading is higher than 1.25 volts, check for binding throttle valve or throttle cable.
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.