How do I replace the crankshaft position sensor on 1993 olds culass sierra with 3.3 engine. Do I need to remove the harmonic balancer? If so I cant find holes in the slots on the balancer to thread bolts into to pull balancer off

Which one ? your vehicle has two !
Crankshaft Position (CKP) Sensor (7X)
Lower rear of the engine block, below the exhaust manifold
Crankshaft Position (CKP) Sensor (24X)
Right side of engine, at the end of the crankshaft, behind the harmonic balancer
24x replacement .
Turn OFF the ignition. Remove the serpentine drive belt from crankshaft pulley. Refer to Drive Belt Replacement in Engine Mechanical. Raise the vehicle on hoist. Refer to Lifting and Jacking the Vehicle in general information. Remove the crankshaft harmonic balancer. Refer to Crankshaft Balancer Replacement in Engine Mechanical. Note the routing of sensor harness before removal. Remove the harness retaining clip with bolt (1). Disconnect the sensor electrical connector. Remove the sensor bolts (2). Remove the sensor.
After replacement of this one you have to do relearn
24x 24

The harmonic balancer on these engines is now press fit onto the crankshaft and requires the use of Tool J-38197 for removal. The torque specification to be used during installation has also been revised. The procedure to be used when replacing the crank sensor is as follows:

REMOVAL

1. Disconnect serpentine belt from crankshaft pulley.



2. Raise vehicle on hoist.



3. Remove right front tire and wheel assembly.



4. Remove right inner fender access cover.



5. Using 28 mm socket, remove crankshaft harmonic balancer retaining bolt.



6. Remove crankshaft harmonic balancer using Tool (J-38197).



7. Remove foreign object deflector (DO NOT use pry bar).



8. Disconnect sensor electrical connector.



9. Remove sensor and pedestal from block face.



10. Remove sensor from pedestal

INSTALLATION

1. Loosely install crankshaft sensor on pedestal.



2. Position sensor with pedestal attached on Tool J-37089.



3. Position tool on crankshaft.



4. Install bolts to hold pedestal to block face, torque to (18-26 lb. ft.).



5. Torque pedestal pinch bolt to (26-44 lbs. in.).



6. Remove Tool J-37089.



7. Install foreign object deflector.



8. Place Tool J-37089 on harmonic balancer and turn. If any vane of the harmonic balancer touches the tool, replace the balancer assembly.



9. Install balancer on crankshaft.



10. Apply thread sealer GM #(NNN) NNN-NNNNor equivalent to threads of crankshaft balancer bolt. Torque bolt to + 56 degrees (104 lb. ft. + 56 degrees).



11. Install inner fender shield.



12. Install tire and wheel assembly. Torque lug nuts to (104 lb. ft.).



13. Lower vehicle.



14. Install serpentine belt.
    

see this vedio

Yes you do....its right behind the harmonic balancer, note...do not use a pry bar to remove the balancer......

REMOVAL & INSTALLATION Fig. 1: Crankshaft Position (CKP) sensor mounting
Fig. 2: The 24X CKP sensor is mounted to the engine front cover - 3.1L (VIN M) engine
2.2L, 2.3L, 3.1L (VIN T and V) and 1991-93 3.4L Engines

1. Disconnect the negative battery cable.
2. Detach the sensor harness connector from the sensor.
3. Unfasten the sensor retaining bolts, then remove the sensor from the engine.
4. Inspect the sensor O-ring for damage, and replace, if necessary. To install:
   
5. If necessary, lubricate a new O-ring with clean engine oil and install on the sensor. Install the sensor into the engine.
6. Install the sensor retaining bolt. Tighten to 88 inch lbs. (10 Nm).
7. Attach the sensor harness connector.
8. Connect the negative battery cable.

2.5L Engine

1. Disconnect the negative battery cable.
2. Remove the DIS assembly, as outlined in Section 2 of this manual.
3. Remove the sensor retaining screws and remove the sensor from DIS assembly.
4. Inspect the sensor O-ring for damage, and replace, if necessary. To install:
   
5. If necessary, lubricate a new O-ring with clean engine oil and install on the sensor.
6. Fit the sensor to the DIS assembly and install the retaining screws. Tighten the retaining screws to 20 inch lbs. (2.3 Nm).
7. Install the DIS assembly to the engine, as outlined in Section 2 of this manual.
8. Connect the negative battery cable.

3.1L (VIN M) Engines 3X CRANKSHAFT POSITION (CKP) SENSOR

1. Disconnect the negative battery cable.
2. Turn the steering wheel to the full left position.
3. Raise and safely support the vehicle.
4. Detach the sensor harness connector from the sensor.
5. Unfasten the sensor retaining bolts, then remove the sensor from the engine.
6. Inspect the sensor O-ring for damage, and replace, if necessary. To install:
   
7. If necessary, lubricate a new O-ring with clean engine oil and install on the sensor. Install the sensor into the engine.
8. Install the sensor retaining bolt. Tighten to 71 inch lbs. (8 Nm).
9. Attach the sensor harness connector.
10. Carefully lower the vehicle.
11. Turn the steering wheel to the straight ahead position, then connect the negative battery cable.

24X CRANKSHAFT POSITION (CKP) SENSOR

1. Disconnect the negative battery cable.
2. Remove the serpentine belt from the crankshaft pulley.
3. Raise and support the vehicle safely.
4. If necessary for access, remove the right front wheel and inner fender access cover.
5. Unfasten the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer using tool J 24420-B.
6. Detach the sensor electrical connector.
7. Unfasten the sensor retaining bolts, then remove the sensor from the vehicle. To install:
   
8. Install the CKP sensor and secure using the retaining bolts. Tighten the bolts to 8 ft. lbs. (10 Nm).
9. Attach the sensor electrical connector.
10. Install the balancer on the crankshaft using special tool J 29113, or equivalent.
11. Apply thread sealer 1052080 or equivalent to the bolt threads of the crankshaft balancer bolt. Tighten the bolt to 110 ft. lbs. (150 Nm).
12. If removed, install the inner fender shield and the right front wheel and tire assembly. Tighten the wheel lug nuts to 100 ft. lbs. (140 Nm).
13. Carefully lower the vehicle.
14. Install the serpentine belt.
15. Connect the negative battery cable.

1994-96 3.4L Engine 3X CRANKSHAFT POSITION (CKP) SENSOR

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle.
3. Remove the intermediate exhaust pipe.
4. Remove the rack and pinion heat shield.
5. Remove the alternator cooling duct.
6. Detach the sensor electric connector.
7. Remove the 3X CKP sensor from the engine.
8. Inspect the sensor O-ring for damage, and replace, if necessary. To install:
   
9. If necessary, lubricate a new O-ring with clean engine oil and install on the sensor. Install the sensor into the engine.
10. Install the sensor-to-block bolt and tighten to 71 inch lbs. (8 Nm).
11. Attach the sensor connector.
12. Install the alternator cooling duct.
13. Install the rack and pinion heat shield.
14. Install the intermediate exhaust pipe.
15. Connect the negative battery cable.

24X CRANKSHAFT POSITION (CKP) SENSOR

1. Disconnect the negative battery cable.
2. Remove the serpentine belt from the crankshaft pulley.
3. Raise and support the vehicle safely.
4. Remove the right front wheel and inner fender access cover.
5. Unfasten the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer using tool J 38197, or equivalent.
6. Detach the sensor electrical connector.
7. Unfasten the sensor retaining bolts, then remove the sensor from the vehicle. To install:
   
8. Install the CKP sensor and secure using the retaining bolts. Tighten the bolts to 8 ft. lbs. (10 Nm).
9. Attach the sensor electrical connector.
10. Install the balancer on the crankshaft.
11. Apply thread sealer 1052080 or equivalent to the bolt threads of the crankshaft balancer bolt. Tighten the bolt to 110 ft. lbs. (150 Nm).
12. If removed, install the inner fender shield and the right front wheel and tire assembly. Tighten the wheel lug nuts to 100 ft. lbs. (140 Nm).
13. Carefully lower the vehicle.
14. Install the serpentine belt.
15. Connect the negative battery cable.

3.8L Engine

1. Disconnect the negative battery cable.
2. Remove the serpentine belt from the crankshaft pulley.
3. Raise and support the vehicle safely.
4. Remove the right front wheel and inner fender access cover.
5. Using a 28mm socket, unfasten the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer using tool J 38197, or equivalent.
6. Remove the CKP sensor shield. Do NOT use a prybar to remove the shield!
7. Detach the sensor electrical connector.
8. Unfasten the sensor retaining bolts, then remove the sensor from the block face. To install:
   
9. Position the CKP sensor to the block face, then secure using the retaining bolts. Tighten the bolts to 14-28 ft. lbs. (20-40 Nm).
10. Install the CKP sensor shield.
11. Attach the sensor electrical connector.
12. Install the balancer on the crankshaft.
13. Apply thread sealer 1052080 or equivalent to the bolt threads of the crankshaft balancer bolt. Tighten the bolt to 110 ft. lbs. (150 Nm), plus an additional 76°turn.
14. Install the inner fender shield and the right front wheel and tire assembly. Tighten the wheel lug nuts to 100 ft. lbs. (140 Nm).
15. Carefully lower the vehicle.
16. Install the serpentine belt.
17. Connect the negative battery cable.

REMOVAL & INSTALLATION

1. Disconnect the negative battery cable.
2. Remove the serpentine drive belt from the crankshaft pulley.
3. Raise and safely support the vehicle.
4. Remove the right front wheel and tire assembly and the right inner fender access cover/splash shield.
5. Using a 28mm socket, remove the crankshaft harmonic balancer retaining bolt.
6. Remove the crankshaft balancer, using a puller if necessary.
7. For 1992-99 vehicles, remove the CKP sensor shield. Fig. 1: If so equipped, remove the crankshaft position sensor shield
   
   
8. Unplug the sensor electrical connector.
9. For 1987-91 vehicles, perform the following:
   1. Remove the sensor and pedestal from the block face.
   2. Remove the sensor from the pedestal.
10. For 1992-99 vehicles, remove the sensor from the block face. To install:
    1. For 1987-91 vehicles, perform the following:
    2. Loosely install the crankshaft sensor on the pedestal.
    3. Position the sensor, with the pedestal attached, on crankshaft sensor installation tool J 37089 or equivalent.
    4. Install the bolt to hold the pedestal to the block face, then tighten to 14-28 ft. lbs. (20-40 Nm). Fig. 2: Position the crankshaft sensor tool on the crankshaft
       Fig. 3: Insert the crankshaft sensor tool into the harmonic balancer
       
       
    5. Tighten the pedestal pinch bolt to 30-35 inch lbs. (3-4 Nm).
    6. Remove the special tool.
    7. Place the crankshaft sensor tool on the crankshaft balancer and turn. If any vane on the harmonic balancer touches the tool, replace the balancer.
11. For 1992-99 vehicles, install the CKP sensor on the block.
    1. Install the retaining bolts and tighten to 14-28 ft. lbs. (20-40 Nm).
    2. Install the crankshaft position sensor shield.
    3. Attach the sensor electrical connector.
12. Install the balancer on the crankshaft.
13. Tighten the crankshaft bolt to 200-239 ft. lbs. (270-325 Nm) for 1987-91 vehicles. For 1992-99 vehicles, tighten to 110 ft. lbs. (150 Nm), plus an additional 76°rotation.
14. Install the inner fender shield and the right tire and wheel assembly.
15. Carefully lower the vehicle.
16. Install the serpentine belt.
17. Connect the negative battery cable.

Crankshaft Sensor REMOVAL & INSTALLATION 3.8L Engine On vehicles with a manual transaxles, the crankshaft position sensor is easily accessed from beneath the engine. On vehicles with automatic transaxles, the rack and pinion heat shield and the converter intermediate exhaust assembly must be removed first.

1. Disconnect the negative battery cable.
2. Disconnect the electrical connector at the sensor.
3. Using a 28mm socket and pull handle, rotate the harmonic balancer until any window in the interrupter is aligned with the crank sensor.
4. Loosen the pinch bolt on the sensor pedestal until the sensor is free to slide.
5. Remove the pedestal to the engine mounting bolts.
6. While manipulating the sensor within the pedestal, carefully remove the sensor and pedestal as a unit. To install:
   
7. Loosen the pinch bolt on the new sensor pedestal until the sensor is free to slide.
8. Verify that the window in the interrupter is still in the correct place.
9. Install the sensor and pedestal as a unit while making sure that the interrupter ring is aligned within the proper slot.
10. Install the pedestal and tighten the engine mounting bolts to 22 ft. lbs. (30 Nm).

3X Sensor

1. Disconnect the negative battery cable.
2. Remove the sensor harness connection to the sensor. Fig. 1: Unsecure the harness, then unfasten the bolt to remove the CKP sensor
   
   
3. Unsecure the sensor block bolt.
4. Remove the Crankshaft Position (CKP) sensor from the vehicle. Inspect the O-ring for cracks and replace if needed. To install:
   
5. Install the new O-ring if needed and lubricate with engine oil.
6. Install the sensor into the hole in the block.
7. Install the mounting screw and tighten to 71-88 inch lbs. (8-10 Nm).
8. Attach the sensor harness connector, then connect the negative battery cable.

Dual Crank Sensor Sections 3 and 4 of this manual also cover testing, removal and installation, and adjustment of many computer controlled components.

1. Disconnect the negative battery cable.
2. Remove the belt(s) from the crankshaft pulley.
3. Raise and support the vehicle safely.
4. Remove the right front wheel and inner fender access cover.
5. Remove the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer.
6. Disconnect the sensor electrical connector.
7. Remove the sensor and pedestal from the engine block, then separate the sensor from the pedestal. To install:
   
8. Loosely install the crankshaft sensor to the pedestal.
9. Using tool J-37089 or equivalent, position the sensor with the pedestal attached, on the crankshaft.
10. Install the pedestal-to-block retaining bolts. Tighten to 14-28 ft. lbs. (20-40 Nm).
11. Tighten the pedestal pinch bolt 30-35 inch lbs. (3-4 Nm).
12. Remove tool J-37089 or equivalent.
13. Place tool J-37089 or equivalent, on the harmonic balancer and turn. If any vane of the harmonic balancer touches the tool, replace the balancer assembly. NOTE: A clearance of 0.025 in. (0.635mm) is required on either side of the interrupter ring. Be certain to obtain the correct clearance. Failure to do so will damage the sensor. A misadjusted sensor of bent interrupter ring could cause rubbing of the sensor, resulting in potential driveability problems, such as rough idle, poor performance, or a no-start condition.
    
14. Install the balancer on the crankshaft. Install the balancer retaining bolt. Tighten the retaining bolt to 200-239 ft. lbs. (270-325 Nm).
15. Install the inner fender shield.
16. Install the right front wheel assembly. Tighten the wheel nuts to 100 ft. lbs. (136 Nm).
17. Lower the vehicle.
18. Install the belt(s).
19. Reconnect the negative battery cable.

24X Crank Sensor

1. Disconnect the negative battery cable.
2. Remove the serpentine belt from the crankshaft pulley.
3. Raise and support the vehicle safely.
4. Remove the crankshaft harmonic balancer retaining bolt, then remove the harmonic balancer.
5. Disconnect the sensor electrical connector.
6. Unfasten the sensor bolts, then remove the sensor. Fig. 2: The 24X crankshaft sensor is secured by two bolts
   To install:
   
7. Install the crankshaft sensor to the engine with the two mounting bolts. Tighten the bolts to 8 ft. lbs. (10 Nm).
8. Attach the electrical harness to the sensor.
9. Using tool J-29113 or equivalent, install the harmonic balancer to the vehicle.
10. Apply a thread sealer such as GM 1052080 or an equivalent to the threads if the crankshaft balancer bolt, then tighten the bolt to 110 ft. lbs. (150 Nm).
11. Lower the vehicle.
12. Install the serpentine belt.
13. Reconnect the negative battery cable.

3.8L Engine

1. Turn OFF the ignition.
   
2. Remove the serpentine belts from the crankshaft pulley.
   
3. Raise the vehicle.
   
4. Remove the right front wheel and tire assembly.
   
5. Remove the right inner fender access cover.
   
6. Hold the flywheel with a (J 37096) flywheel holding tool.
   
7. Using 28 mm socket, remove the crankshaft harmonic balancer retaining bolt.
   
8. Remove the crankshaft harmonic balancer, using a (J 38197-A) balancer remover.
   
9. Remove the crankshaft position sensor shield (1). Do not use a pry bar.
   
10. Disconnect the sensor electrical connector.
    
11. Remove the attaching bolts from the crankshaft position sensor.
    
12. Remove the crankshaft position sensor from the block face.
    

To install:

1. Position the crankshaft position (CKP) sensor to the block.
   
2. Install the bolts to hold the CKP sensor to the block face. Tighten the bolts to 14-28 ft. lbs. (20-40 Nm).
   
3. Reinstall the crankshaft position sensor shield.
   
4. Connect the CKP sensor electrical connector.
   
5. Position the crankshaft harmonic balancer on the crankshaft.
   
6. Hold the flywheel with a (J 37096) flywheel holding tool.
   
7. Using a (J 36660-A) torque/angle meter, tighten the harmonic balancer bolt to 110 ft. lbs. (150 Nm), plus an additional 76 degrees.
   
8. Install the right inner fender access cover.
   
9. Install the right front wheel and tire assembly.
   
10. Tighten the wheel nuts to 104 ft. lbs. (140 Nm.).
    
11. Lower the vehicle.
    
12. Reinstall the serpentine belts.
    

It looks like this:

REMOVE OR DISCONNECT

1. Serpentine belt from the crankshaft pulley.
2. Raise the vehicle on a hoist.
3. Right front tire and wheel assembly.
4. Right inner fender access cover.
5. Using a 28 mm socket, remove the crankshaft harmonic balancer retaining bolt.
6. Crankshaft harmonic balancer using tool J 38192 or equivalent.
7. Sensor electrical connector.
8. Foreign object deflector.
9. Sensor and pedestal from block face.
10. Sensor from pedestal.

INSTALL OR CONNECT:

1. Loosely install the crankshaft sensor on the pedestal.
2. Position the sensor with pedestal attached on special Tool J 37089.
3. Position the special tool on the crankshaft.
4. Bolts to hold the pedestal to the block face, torque to 20-40 Nm (14-28 lb.ft).
5. Torque the pedestal pinch bolt to 3-4 Nm (38-40 lb.in).
6. Remove special tool J 37089.
7. Place the special tool 37089 on the harmonic balancer and turn. If any vane of the harmonic balancer touches the tool, replace the balancer assembly.
8. Balancer on the crankshaft.

• Apply thread sealer (GM 1052080) or equivalent to the threads of the balancer bolt.

1. Torque the crankshaft bolt to 140 Nm + 56°(104 lb.ft + 56°).
2. Foreign object deflector.
3. Electrical connector.
4. Inner fender shield.
5. Tire and wheel assembly, torque to 140 Nm (104 lb.ft).
6. Lower the vehicle.
7. Serpentine belt.

7X Crankshaft Position (CKP) Sensor
Lower rear of engine
4
25
--
24X Crankshaft Position (CKP) Sensor
Right hand side of engine, at end of crankshaft, behind harmonic balancer
7X Crankshaft Position (CKP) Sensor
Lower rear of engine
4
25
--
24X Crankshaft Position (CKP) Sensor
Right hand side of engine, at end of crankshaft, behind harmonic balancer
Right hand side of engine, at end of crankshaft, behind harmonic balancer