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 MANUALSBUICK1985CENTURY V6-231 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMCAMSHAFT POSITION SENSORADJUSTMENTS
1985 Buick Century V6-231 3.8L
Camshaft Position Sensor: Adjustments
1985 Buick Century V6-231 3.8LSECTION Adjustments
Fig. 32 C3I camshaft sensor adjustment:
CAMSHAFT SENSOR TIMING
The following adjustment does not affect spark timing.
1. Rotate crankshaft until No. 1 cylinder is at TDC, compression stroke.
2. Mark harmonic balancer, then rotate crankshaft to 25° after TDC.
3. Remove spark plug wires from ignition coil.
4. Remove terminal ``B'' of wire sensor 3-way connector on module side with suitable tool.
5. Install suitable jumper wire into 3-way connector ``B'' terminal, then connect other end to removed wire.
6. Connect suitable digital voltmeter between jumper wire and ground, Fig. 29.
7. Turn ignition On, then rotate sensor counterclockwise until sensor switch closes. This is indicated by voltage reading going from a high of 5 to 12 volts to a low of 0 to 2 volts. Low voltage indicates switch closing.
8. Tighten drive assembly securing bolt.
9. Install spark plug wires, then remove jumper wire and repair connection.
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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.