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 MANUALSPONTIAC1985GRAND AM V6-181 3.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORADJUSTMENTS
1985 Pontiac Grand AM V6-181 3.0L
Throttle Position Sensor: Adjustments
1985 Pontiac Grand AM V6-181 3.0LSECTION Adjustments
Exc. 4-110 (1.8L) & 4-122 (2.0L) Turbo
1. Remove TPS attaching screws, then apply thread locking compound 1052624 or equivalent to screw threads and reinstall. Do not tighten screws.
2. Connect suitable SCAN tester to diagnostic connector, or install three jumper wires between TPS and TPS harness connector and connect digital voltmeter to TPS terminals ``A'' and ``B'' on all except V6-231 (3.8L) or terminals ``B'' and ``C'' on V6-231 (3.8L) engines.
3. With ignition on and engine not running, measure sensor voltage.
4. With throttle in closed position, adjust TPS to obtain .55 ± .05 volts on V6-173 (2.8L) and V6-181 (3.0L); .40 ± .05 volts on V6-231 (3.8L); .54 ± .075 volts on V8-305 (5.0L) & V8-350 (5.7L).
5. Tighten screws, then recheck adjustment to ensure it did not change.
6. Turn ignition Off, then remove jumper wires and connect TPS wire connector.
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.