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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSBUICK1991CENTURY L4-151 2.5L VIN R TBIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORADJUSTMENTS
1991 Buick Century L4-151 2.5L VIN R TBI
Throttle Position Sensor: Adjustments
1991 Buick Century L4-151 2.5L VIN R TBISECTION Adjustments
TPS Adjustment Check:
The Throttle Position Sensor (TPS) is not adjustable. The normal closed throttle position voltage is below 1.33 volts, and normal wide open throttle position voltage is approximately 5.0 volts. If these limits are not in specification, check for freedom of throttle movement, and accelerator pedal interference from carpets and other obstructions. If the problem is not corrected, replace the TPS.
The ECM has the ability to self zero the TPS voltage if it is below approximately 1.33 volts. A TPS voltage that does not fall within 0.33 volts and 1.33 volts should be replaced after checking connections.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.