Spectra S10120 Engine Crankshaft Position Sensor

Engine Crankshaft Position Sensor for GM Applications

The Spectra S10120 engine crankshaft position sensor provides the signal the ignition system uses to monitor engine speed and set timing. It is a direct-fit replacement for a range of GM vehicles, including Buick Century, Chevrolet Lumina, and Pontiac Grand Am applications.

• Engine crankshaft position sensor for ignition timing and RPM signal input
• Helps eliminate the need for manual distributor timing
• Direct replacement for select 1987-1992 Buick, Chevrolet, Oldsmobile, and Pontiac models
• Cross-reference part numbers include Standard Ignition PC3 and 3H1
• Part number: S10120

How This Sensor Works

The crankshaft position sensor is a key engine management component that reports crankshaft position and rotational speed to the ignition system. On compatible Buick Century, Chevrolet Celebrity, Oldsmobile Cutlass Ciera, and Pontiac 6000 applications, this signal supports accurate ignition timing and engine RPM monitoring for proper engine operation. Spectra S10120 is built for vehicles that rely on electronic timing control rather than manual distributor adjustment.

Vehicle Fitment

• Fits 1987-1992 Buick Century, N/A
• Fits 1987-1991 Buick Skylark, N/A
• Fits 1990-1992 Chevrolet Lumina, N/A
• Fits 1987-1990 Chevrolet Celebrity, N/A
• Fits 1987-1992 Oldsmobile Cutlass Ciera, N/A
• Fits 1987-1990 Oldsmobile Cutlass Cruiser, N/A
• Fits 1988-1991 Oldsmobile Cutlass Calais, N/A
• Fits 1987-1991 Pontiac 6000, N/A
• Fits 1987-1991 Pontiac Grand Am, N/A
• Fits 1987-1988 Pontiac Fiero, N/A

Common Issues This Part Addresses

• Intermittent or no-start conditions related to crankshaft signal loss
• Incorrect ignition timing on electronically controlled systems
• Unstable engine speed readings
• Distributor timing concerns on vehicles that use crankshaft input for ignition control

Installation Notes

Confirm the connector style, mounting location, and engine application before installation. Inspect related ignition components and wiring for damage, corrosion, or looseness before replacing the sensor. After installation, verify proper engine start-up and timing signal operation.

Quality Assurance

Spectra manufactures this crankshaft position sensor as an OE-style replacement for select GM ignition systems. The S10120 is listed for direct fitment across the specified Buick, Chevrolet, Oldsmobile, and Pontiac applications.