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Noise Diagnosis - Front Suspension

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Any noise from the front of the vehicle that is induced by Vehicle Speed or Driving Terrain as related to the front suspension.
NOTE: Special Tools: Chassis Ear (J-39570).
  1. Did you review the General Description and perform the necessary Inspections? If so, go to next step. If not, go to SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS .
  2. Attempt to duplicate the condition. Road test the vehicle. Did you duplicate the condition? If so, go to next step. If not, then system is okay.
  3. Is the noise reactive to vehicle load or speed? If so, go to next step. If not, go to step  7.
  4. Inspect the tires for the following condition:
    • Proper tire Inflation and adjust as necessary.
    • Unusual tire wear.
    • Inspect the wheel nuts for looseness and tighten as necessary.
    Did you find and correct the condition? If so, go to step  14. If not, go to next step.
  5. Inspect the front wheel bearings. Refer to WHEEL BEARINGS DIAGNOSIS . Did you find and correct the condition? If so, go to step  14. If not, go to next step.
  6. If applicable inspect for front axle or transaxle noises. Refer to SYMPTOMS - FRONT DRIVE AXLE in FRONT DRIVE AXLE or SYMPTOMS - AUTOMATIC TRANSMISSION in AUTOMATIC TRANSAXLE . Did you find and correct the condition? If so, go to step  14. If not, go to next step.
  7. Bounce the front of the vehicle in order to duplicate the noise. Did you duplicate the noise? If so, go to next step. If not, go to step  9.
  8. Raise and support the vehicle. Inspect the front suspension components for looseness. Tighten as necessary. Refer to FASTENER TIGHTENING SPECIFICATIONS in FRONT SUSPENSION SYSTEM . Inspect the front suspension components for damage. Repair as necessary. Lower the vehicle. Did you find and correct the condition? If so, go to step  14. If not, go to next step.
  9. Install the J 39570 Chassis Ear or equivalent. Bounce the front of the vehicle. Use the J 39570 Chassis Ear or equivalent in order to locate the source of the noise. If necessary, road test the vehicle. Repair as necessary. Did you find and correct the condition? If so, go to step  14. If not, go to next step.
  10. Inspect the ball joints and steering components for the following conditions: Did you find and correct the condition? If so, go to step  14. If not, go to next step.
  11. Inspect for damaged shock absorbers. Refer to STRUTS OR SHOCK ABSORBERS ON-VEHICLE TESTING . Did you find and correct the condition? If so, go to step  14. If not, go to next step.
  12. Inspect the front stabilizer shaft and stabilizer shaft links for damage. Repair as necessary. Refer to STABILIZER SHAFT REPLACEMENT or to STABILIZER SHAFT LINK REPLACEMENT in FRONT SUSPENSION SYSTEM . Did you find and correct the condition? If so, go to step  14. If not, go to next step.
  13. Inspect the control arms for damage. Repair as necessary. Refer to LOWER CONTROL ARM REPLACEMENT and UPPER CONTROL ARM REPLACEMENT in FRONT SUSPENSION SYSTEM . After repair, go to next step.
  14. Operate the system in order to verify the repair. Did you correct the condition? If so, then system is okay. If not, go to step  3.
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