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Noise Diagnosis - Front Suspension

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

DEFINITION: Any noise emitted from the front of the vehicle that is induced by VEHICLE SPEED or DRIVING TERRAIN as related to the front suspension.

  1. Did you review the General Description and perform the necessary Inspections? If yes, go to next step. If no, see SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS .
  2. Attempt to duplicate the condition. Road test the vehicle. Did you duplicate the condition? If yes, go to next step. If no, system is OK.
  3. Is the noise reactive to vehicle load or speed? If yes, go to next step. If no, go to step  7.
  4. Inspect the tires for the following condition:
  5. Inspect the front wheel bearings. Refer to Wheel Bearings Diagnosis. Did you find and correct the condition? If yes, go  14. If no, go to next step.
  6. If applicable inspect for front axle or transaxle noises. Did you find and correct the condition? If yes, go to step  14. If no, go to next step.
  7. Bounce the front of the vehicle in order to duplicate the noise. Did you duplicate the noise? If yes, go to next step. If no, go to step  9.
    1. Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE .
    2. Inspect the front suspension components for looseness. Refer to FASTENER TIGHTENING SPECIFICATIONS in FRONT SUSPENSION SYSTEM .
    3. Inspect the front suspension components for damage and repair as necessary.
  9. Install the J-39570 Chassis Ear or equivalent. Bounce the front of the vehicle, using the J-39570 or equivalent in order to locate the source of the noise. If necessary road test the vehicle. Repair or replace any damaged components as necessary. Did you find and correct the condition? If yes, go to step  14. If no, go to next step.
    Fig 1: Identifying J35970 Chassis Ear
    G00354789Courtesy of GENERAL MOTORS CORP.
  10. Inspect the ball joints and steering components for the following conditions:
    • Lack of lubrication where applicable.
    • Looseness in the ball joints. Refer to BALL JOINT INSPECTION .
    • Looseness in the tie rods. Refer to TIE ROD END REPLACEMENT - OUTER or TIE ROD REPLACEMENT - INNER in POWER STEERING SYSTEM .
    Did you find and correct the condition? If yes, go to step  14. If no, 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 yes, go to step  14. If no, go to next step.
  12. Inspect the front stabilizer shaft and stabilizer shaft links for damage and repair as necessary. Refer to STABILIZER SHAFT REPLACEMENT or STABILIZER SHAFT LINK REPLACEMENT in FRONT SUSPENSION SYSTEM . Did you find and correct the condition? If yes, go to step  14. If no, go to next step.
  13. Inspect for control arm damage and repair as necessary. Refer to LOWER CONTROL ARM REPLACEMENT in FRONT SUSPENSION SYSTEM . Did you find and correct the condition? If yes, go to next step.
  14. Operate the system in order to verify the repair. Did you correct the condition? If yes, system is OK. If no, go back to step  3.
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