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Poor Directional Stability

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The driver is unable to maintain consistent, predictable vehicle driving control in any direction.
  1. Did you review the General Description and perform the necessary inspections? If yes, go to next step. If no, go to SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS  .
  2. Verify that the directional stability is poor. Does the system operate normally? If yes, system is okay. If no, go to next step.
  3. Ensure that the tires are all the same size, make, and adequate tread depth. Repair as necessary. Ensure that all of the tires are inflated to the correct pressure. Does the vehicle still exhibit poor directional stability? If yes, go to next step. If no, system is okay.
  4. Inspect the stabilizer shaft, links, and insulators for wear or damage. Repair as necessary. Refer to Stabilizer Shaft Link Replacement and Stabilizer Shaft Insulator Replacement in Front Suspension. Does the vehicle still exhibit poor directional stability? If yes, go to next step. If no, system is okay.
  5. Inspect the lower control arms, ball joints and tie rods for wear or damage. Repair as necessary. Refer to Lower Control Arm Replacement and Lower Ball Joint Replacement in Front Suspension. Refer to Tie Rod End Replacement - Outer in Power Steering System. Does the vehicle still exhibit poor directional stability? If yes, go to next step. If no, system is okay.
  6. Inspect the wheel bearings/hubs for looseness or excessive lateral runout. Refer to WHEEL BEARINGS DIAGNOSIS  . Does the vehicle still exhibit poor directional stability? If yes, go to next step. If no, system is okay.
  7. Inspect the vehicle trim height. Refer to TRIM HEIGHT INSPECTION PROCEDURE  . Repair as necessary. Does the vehicle still exhibit poor directional stability? If yes, go to next step. If no, system is okay.
  8. Inspect and adjust the wheel alignment as necessary. Refer to Measuring Wheel Alignment in Wheel Alignment. Does the vehicle still exhibit poor directional stability? If yes, go to next step. If no, system is okay.
  9. Inspect the steering gear and steering column for looseness. Repair as necessary. After repairs, go to next step.
  10. Operate the vehicle in order to verify the repair. Did you correct the condition? If yes, system is okay. If no, go to step  3 .
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