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 MANUALSOLDSMOBILE1988NINETY-EIGHT V6-3800 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORADJUSTMENTS
1988 Oldsmobile Ninety-Eight V6-3800 3.8L
Throttle Position Sensor: Adjustments
1988 Oldsmobile Ninety-Eight V6-3800 3.8LSECTION Adjustments
Throttle Position Sensor and IAC Specifications:
1. Unplug electrical connector at TPS and install jumper wires between the three terminals.
2. Connect a digital voltmeter to signal voltage terminal and sensor ground. NOTE - See code 21 wiring diagram for terminal identification.
3. With ignition on engine off, check voltmeter reading. If not to specification drill out spot weld on adjustment screws (if used).
4. Remove screws and apply thread locking compound and reinstall screws.
5. Rotate TPS until desired voltage is obtained, and tighten screws.
6. Ignition off, remove jumpers and reconnect TPS harness. Clear any trouble codes stored.
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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.