The crank sensor on a 1991 Pontiac Grand Prix is located on the
passenger side of the engine block, near the crankshaft pulley. However, the exact position can vary slightly depending on the engine (3.1L V6 or 3.8L V6). You'll likely find it near the bell housing.
It's a good idea to consult a repair manual specific to your vehicle's engine (3.1L or 3.8L) for a precise location. A picture diagram in the manual would be very helpful. You can often find these manuals online or at auto parts stores.
