How To Replace 1998 3.8 Pontiac Crankshaft Position Sensor

The crankshaft position sensor on a Pontiac has a direct effect on the performance of the engine but it is immediately fixable if you know how to rpelace 1998 3.8 Pontiac crankshaft position sensor. The 1998 Pontiacs are not known for this defect, but cars of this age show signs of aging that often manifest themselves around this time, including crankshaft problems. Here is how to change a crankshaft position sensor on your 1998 3.8 Pontiac. 


  • Wrench
  • Wheel lug wrench
  • Floor jack and axle stands
  • Socket set and 28mm socket
  • Special tool no. J-37096 + J-38197-A
  • Deep socket set and extension


  1. Disconnect the negative battery lead. Undo the wheel lug nuts slightly. Remove the drive belt from the car. 
  2. Jack up the Pontiac and secure it on axle stands,  removing the road wheels.
  3. Take the inner fenders off with a socket set and ratchet.
  4. Remove the harmonic balancer which is on the end of the crankshaft. The special tool can hold the crankshaft still while this removal is performed.
  5. Use the special tool to remove the harmonic balancer. Take the crankshaft position sensor (CKP) shield off by its 3 bolts. Disconnect the CKP sensor using a deep socket and extension bar.

Reverse the process using the new CKP sensor and make sure to fit the shield and the harmonic damper correctly. Replace the inner fenders using all of the bolts. Tighten the road wheels on slightly, lower the car and tighten the lug nuts properly. Connect the battery lead and fire up the Pontiac to make sure everything works as it should.

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