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Poor Directional Stability

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

DEFINITION: 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 so, go to next step. If not, see SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS  .
  2. Verify that the directional stability is poor. Does the system operate normally? If so, system is OK. If not, 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. Refer to TIRE INFLATION PRESSURE SPECIFICATIONS  . Does the vehicle still exhibit poor directional stability? If so, go to next step. If not, system is OK.
  4. Inspect the stabilizer shaft, links, and insulators for wear or damage. Replace as necessary. Refer to the following:
    • STABILIZER SHAFT REPLACEMENT in FRONT SUSPENSION
    • STABILIZER SHAFT LINK REPLACEMENT in FRONT SUSPENSION
    • STABILIZER SHAFT INSULATOR REPLACEMENT in FRONT SUSPENSION
    Does the vehicle still exhibit poor directional stability? If so, go to next step. If not, system is OK.
  5. Inspect the lower control arms, ball joints and tie rods for wear or damage. Repair as necessary. Refer to the following:
    • LOWER CONTROL ARM REPLACEMENT in FRONT SUSPENSION
    • LOWER BALL JOINT REPLACEMENT in FRONT SUSPENSION
    • OUTER TIE ROD END
    Does the vehicle still exhibit poor directional stability? If so, go to next step. If not, system is OK.
  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 so, go to next step. If not, system is OK.
  7. Inspect the vehicle trim height. Refer to TRIM HEIGHT INSPECTION PROCEDURE  . Repair as necessary. Does the vehicle still exhibit poor directional stability? If so, go to next step. If not, system is OK.
  8. Inspect and adjust the wheel alignment as necessary. Refer to SPECIFICATIONS . Does the vehicle still exhibit poor directional stability? If so, go to next step. If not, system is OK.
  9. Inspect the steering gear and steering column for looseness. Repair as necessary. After repairs are complete, go to next step.
  10. Operate the vehicle in order to verify the repair. Did you correct the condition? If so, system is OK. If not, go back to step  3 .
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