The 1991 3.1-liter V-6 Lumina was a mid-sized sedan created by Chevrolet in Ontario, Canada. The Lumina is equipped with a crankshaft sensor that detects the position of the vehicle's crankshaft, sending data to the sedan's on-board computer. Having the crankshaft sensor allows the Lumina to make necessary adjustments for the engine to work optimally.
Place a hand above the Lumina's hood to check for heat. If you feel heat, wait until the hood is cool to the touch before continuing.
Disconnect the hood retaining claims, and raise the hood. Keep the hood upright by connecting the hood support rod, a thin metal rod in the front engine area, to the hood's hook, which is on the front underside of the hood.
Use a flashlight if necessary to observe the passenger's side of the engine, specifically in the lower engine area for the engine block. The engine block can be identified as a large, iron or plastic structure that holds the Lumina's cylinders and components in position.
Locate the crankshaft pulley on the engine block, an erect metal sphere, and observe directly in front of this pulley. The crankshaft sensor is mounted in front of this sphere, identifiable as a thin black cord.
