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Pinpoint Test C: Steering System Noise

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK FOR MECHANICAL NOISE 
      WARNING: If equipped with fire suppression system, depower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
    • If equipped with fire suppression system, depower the system.
    • Test drive the vehicle to verify the steering system noise.
    • Does the steering system make a clunk noise? 

    Yes  : CHECK for loose, worn or damaged tie rod ends. REFER to component tests, STEERING LINKAGE . If equipped with fire suppression system, GO to  C7.

    CHECK for loose or worn steering gear isolators (if applicable). INSTALL new isolators if necessary. REFER to POWER STEERING . If equipped with fire suppression system, GO to  C7.

    If the noise is from the steering column, CHECK the steering column shaft for grounding through the body and REPAIR as necessary. If equipped with fire suppression system, GO to  C7.

    If the noise is from the steering column boot bearing, INSTALL a new steering column boot bearing. REFER to STEERING COLUMN . If equipped with fire suppression system, GO to  C7.

    If the noise is from the suspension components, INSTALL new suspension components as necessary. REFER to FRONT SUSPENSION . If equipped with fire suppression system, GO to  C7.

    If the noise is from loose, worn or damaged steering column shaft U-joint(s), INSTALL a new lower steering column shaft. REFER to STEERING COLUMN . If equipped with fire suppression system, GO to  C7.

    No  : If a squeak is present in the steering column, REPAIR the steering column mountings or ALIGN the steering column as necessary. REFER to STEERING COLUMN . If equipped with fire suppression system, GO to  C7.

    For all other concerns, GO to C2.

  2. C2 VERIFY THE CONCERN 
    NOTE: Make sure the vehicle is on a flat dry surface, the transmission is in PARK, and the windows are rolled up.
    NOTE: Some power steering noise is expected. If in doubt of the acceptability of the noise level, evaluate another vehicle of the same model and powertrain.
    • Key in START position.
    • Turn the steering wheel 1/2 turn off-center to the right then 1/2 turn off-center to the left.
    • Is the power steering noisy? 

    Yes  : If a grunt noise is present, VERIFY the steering column boot is OK and the exhaust system is not grounding out. If equipped with fire suppression system, GO to  C7.

    If a moan is present, VERIFY that the tie-rod ends and ball joints are OK. If equipped with fire suppression system, GO to  C7.

    GO to C3.

    No  : If a squeal is present, INSPECT and INSTALL a new engine drive belt or belt tensioner as necessary. REFER to ACCESSORY DRIVE . If equipped with fire suppression system, GO to  C7.

    If the steering system noise is a hiss or whistle, INSPECT the steering column boot at the dash panel. REPAIR or INSTALL a new boot as necessary. REFER to STEERING COLUMN . If equipped with fire suppression system, GO to  C7.

    INSPECT the steering gear input shaft and valve for wear or damage. REFER to POWER STEERING . If equipped with fire suppression system, GO to  C7.

    INSPECT the power steering gear, steering column shaft and power steering lines and hoses for grounding to the body and REPAIR as necessary. If equipped with fire suppression system, GO to  C7.

    INSPECT for openings or missing plugs in the instrument panel cowl and REPAIR as necessary. If equipped with fire suppression system, GO to  C7.

    If there are no missing plugs or openings in the cowl, grounded power steering gear, steering column shaft or power steering lines or hoses, GO to  C6.

  3. C3 CHECK FOR COLD START NOISE 
    NOTE: Some noise during an extremely cold start (-25.5°C [-14°F]) is normal and should improve as the steering system warms up, usually within 60 seconds.
    • Key in START position.
    • Verify the noise condition.
    • Is the noise present only during cold start up? 

    Yes  : CHECK for contamination in the power steering reservoir screen. FLUSH the power steering system as necessary. REFER to POWER STEERING SYSTEM FLUSHING . TEST the system for normal operation. If equipped with fire suppression system, GO to  C7.

    No  : GO to C4.

  4. C4 INSPECT THE POWER STEERING FLUID 
    • Key in OFF position.
    • With the engine OFF, inspect the power steering fluid for aeration.
    • Is the power steering fluid foamy or aerated? 

    Yes  : GO to C5.

    No  : PURGE the power steering system. REFER to POWER STEERING SYSTEM PURGING . If equipped with fire suppression system, GO to  C7.

    If a whine or a moan is still present, INSTALL a new power steering pump. REFER to POWER STEERING . If equipped with fire suppression system, GO to  C7.

    If a grunt is still present, INSTALL a new power steering gear. REFER to POWER STEERING . If equipped with fire suppression system, GO to  C7.

  5. C5 CHECK THE POWER STEERING FLUID LEVEL WITH THE ENGINE ON AND OFF 
    NOTE: Record the vacuum level when the pump noise occurs with no steering input. Vacuum level should be greater than 34 kPa (10 in-Hg) with the CII pump and 51 kPa (15 in-Hg) with the CIII pump.
    • Key in START position.
    • With the engine running, inspect the power steering fluid level.
    • Key in OFF position.
    • With the engine off, inspect the power steering fluid level.
    • Does the power steering fluid level change with the engine off? 

    Yes  : PURGE the power steering system. REFER to POWER STEERING SYSTEM PURGING . If equipped with fire suppression system, GO to  C7.

    No  : GO to C6.

  6. C6 CHECK THE POWER STEERING PUMP 
    NOTE: Do not turn the steering wheel to either the right or left stop. Power steering relief noise occurs and is normal at the stop positions.
    • Key in START position.
    • With the engine running, rotate the steering wheel 90 degrees to the left and then 90 degrees to the right.
    • Does the frequency of the hiss change between the left and right positions? 

    Yes  : INSTALL a new power steering gear. REFER to POWER STEERING . If equipped with fire suppression system, GO to C7.

    No  : INSTALL a new power steering pump. REFER to POWER STEERING . If equipped with fire suppression system, GO to C7.

  7. C7 REPOWER THE FIRE SUPPRESSION SYSTEM 
      WARNING: If equipped with fire suppression system, repower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
    • Verify that the fire suppression system is repowered. Refer to FIRE SUPPRESSION SYSTEM .
    • Is the fire suppression system repowered? 

    Yes  : Fire suppression system repowering is complete.

    No  : REFER to FIRE SUPPRESSION SYSTEM for fire suppression system depowering and repowering procedure.

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