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Eric, Automotive Repair Shop Manager
Category: Buick
Satisfied Customers: 32557
Experience:  20+ yrs. experience as repair shop manager and technician.
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How do you replace crankshaft position sensor on a 1995 Buick

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How do you replace crankshaft position sensor on a 1995 Buick Riviera 3.8l supercharged engine?



Below are directions. The ckp sensor is behind the harmonic balancer:


  • Remove the serpentine drive belt from the crankshaft pulley.
  • Raise and safely support the vehicle.
  • Remove the right front wheel and tire assembly and the right inner fender access cover/splash shield.
  • Using a 28mm socket, remove the crankshaft harmonic balancer retaining bolt.
  • Remove the crankshaft balancer, using a puller if necessary.
  • remove the CKP sensor shield.

  • Click image to see an enlarged view

    Fig. Fig. 6: , remove the crankshaft position sensor shield

    1. Unplug the sensor electrical connector.
    2. remove the sensor from the block face.

    To install:



    1. 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.

    2. Install the balancer on the crankshaft.
    3. Tighten the crankshaft bolt to 110 ft. lbs. (150 Nm), plus an additional 7° rotation.
    4. Install the inner fender shield and the right tire and wheel assembly.
    5. Carefully lower the vehicle.
    6. Install the serpentine belt.
    7. Connect the negative battery cable.
    Customer: replied 7 years ago.
    What is the relationship between the crankshaft sensor and ignition module and coilpack?



    The 3X crankshaft position sensor produces 3 different length ON/OFF pulses per crankshaft revolution. When a 3X interrupter ring window is between the magnet and the inner switch, the magnetic field will cause the 3X Hall effect switch to ground the 3X signal voltage supplied from the ignition control module. The 18X interrupter ring and Hall effect switch reacts similarly.

    The ignition control module interprets the 18X and 3X ON/OFF signals as an indication of crankshaft position, and must have both signals to fire the correct ignition coil. The ignition control module determines crankshaft position for the correct ignition coil sequencing by counting how may 18X signal transitions occur, ON, OFF or OFF, ON during a 3X pulse



    If you have any further questions on the ckp for this car, feel free to ask, otherwise click the accept button to pay for services rendered, thank you

    Customer: replied 7 years ago.
    Do i have to measure the clearance between the interrupter rings at the back of the harmonic balancer and the crankshaft position sensor?



    That is only necessary on the earlier models from 87-92. 93 and newer models you dont have to do that.

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