Where is cam position sensor on 1991 buick regal?
The camshaft position sensor (CMP sensor) on a 1991 Buick Regal is located on the distributor. Since the 1991 Regal likely has a distributor-based ignition system (as opposed to a coil-on-plug system), the CMP sensor is integrated into the distributor itself. You won't find a separate sensor. To access it, you'll need to remove the distributor.