The crank position sensor (CKP) on the 1998 GMC Sierra 1500 Pickup with the 4.3L engine is located on the bellhousing, just above the oil pan. It is a small, black sensor with two wires coming out of it. The sensor is held in place by a single bolt.
Here are the steps on how to locate the crank position sensor on a 1998 GMC Sierra 1500 Pickup with the 4.3L engine:
1. Park the truck on a level surface and turn off the engine.
2. Allow the engine to cool down completely.
3. Open the hood.
4. Locate the bellhousing on the front of the engine. It is the large, round housing that connects the engine to the transmission.
5. Look just above the oil pan for the crank position sensor. It is a small, black sensor with two wires coming out of it.
6. The sensor is held in place by a single bolt.
Here is a diagram of the location of the crank position sensor on a 1998 GMC Sierra 1500 Pickup with the 4.3L engine:
[Image of the crank position sensor location on a 1998 GMC Sierra 1500 Pickup with the 4.3L engine]
If you are having trouble finding the crank position sensor, you can always consult a repair manual or take your vehicle to a qualified mechanic.