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Posted on Jan 23, 2012
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How do I change a crank sensor on a 1998 Buick Lasabre?

Getting no spark so I am thinking crank sensor is bad. Changed module with one that is good and still no spark

1 Answer

ZJ Limited

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  • Cars & Trucks Master 17,989 Answers
  • Posted on Jan 23, 2012
ZJ Limited
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1998 Buick Lesabre 3.8L SFI OHV 6cyl

The dual Crankshaft Position (CKP) sensor is mounted to the front of the engine, attached to an aluminum bracket mounted to the left side of the engine at the timing chain cover. A 4-wire connector plugs into the sensor, connecting it to the ignition control module.


How do I change a crank sensor on a 1998 Buick Las - 1_23_2012_5_18_14_pm.gif

Fig. 1: The Crankshaft Position (CKP) sensor is mounted to the front left side of the timing chain cover

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. : If so equipped, remove the crankshaft position sensor shield

  1. Unplug the sensor electrical connector.
  2. For 1987-91 vehicles, perform the following:
    1. Remove the sensor and pedestal from the block face.
    2. Remove the sensor from the pedestal.
  3. 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).
  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.
  1. 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.

  2. Install the balancer on the crankshaft.
  3. 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 7 degrees 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.
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

3 Related Answers

Anonymous

  • 73 Answers
  • Posted on Apr 24, 2009

SOURCE: Car won't start? 1992 Buick LaSabre

three core plug hahahah it has 3 coils crank sensor is located at the crank pulley it sits inside and creates a magnetic field and produces a low ac voltage 5 ac volts or less module then converts it to a squar wave to fire injectors and coils

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Anonymous

  • 79 Answers
  • Posted on Oct 31, 2010

SOURCE: 1990 buick lasabre with a

1. Monitor the 5v reference, Gray wire to the Throttle Position Sensor (TPS) with a Digital Volt Ohm Meter (DVOM) set to the MIN/MAX setting.

2. Monitor the TPS signal circuit, Blue wire with a DVOM. Voltage should range smoothly from approximately 0.44 to 5.0 volts as the throttle is opened.

3. Tap test the Electronic Control Module (ECM) and see if the codes come back or if the engine reacts.

possible causes wiring or Powertrain Control Module (PCM)

Anonymous

  • 227 Answers
  • Posted on Feb 05, 2011

SOURCE: 1989 buick century 3.3 V6 has no spark. Changed

the crankshaft sensor has to be adjusted or is will hit and break

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2. Monitor the TPS signal circuit, Blue wire with a DVOM. Voltage should range smoothly from approximately 0.44 to 5.0 volts as the throttle is opened.

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