Where is the crankshaft sensor located on a 1990 Oldsmobile cutlass ciera 2.5 l?

The crankshaft position sensor (CKP sensor) on a 1990 Oldsmobile Cutlass Ciera with a 2.5L engine is typically located on the passenger side of the engine block, near the bottom of the engine, close to the crankshaft pulley.

However, without a visual inspection of your specific engine, this is only a general location. The exact position can vary slightly depending on the specific engine configuration. It's a good idea to consult a repair manual specific to your vehicle's year, make, and model for a diagram and precise location. These manuals often have clear pictures and detailed descriptions.