Toyota
Ford Kuga
 Service Manual
Noise, Vibration and Harshness
Noise, Vibration and Harshness (NVH)

Noise Conditions

  • Gear noise is typically a howling or whining due to gear damage or incorrect bearing preload. It can occur at various speeds and driving conditions, or it can be continuous
  • Chuckle is a particular rattling noise that sounds like a stick against the spokes of a spinning bicycle wheel. It occurs while decelerating from 64 km/h (40 mph) and can usually be heard all the way to a stop. The frequency varies with vehicle speed.
  • Knock is very similar to chuckle, though it may be louder and occurs on acceleration or deceleration. The teardown will disclose what has to be corrected.

Clicking, popping or grinding noises may be caused by the following:

  • worn, damaged or incorrectly installed wheel bearing, suspension or brake component.

Check and rule out tires, exhaust and trim items before disassembling the transmission to diagnose and correct gear noise.

The noises described under Road Test usually have specific causes that can be diagnosed by observation as the unit is disassembled. The initial clues are the type of noise heard on the road test and driving conditions.

Vibration Conditions

Vibration at highway speeds may be caused by the following:

  • out-of-balance front or rear wheels.
  • out-of-round tires.

Shudder or vibration during acceleration may be caused by the following:

  • damaged powertrain/drivetrain mounts.
  • excessively high constant velocity (CV) joint operating angles caused by incorrect ride height.

    Check ride height, verify correct spring rate and check items under inoperative conditions.

    More about «Noise, Vibration and Harshness»:

    Noise, Vibration and Harshness (NVH)

    Road Test

    Road Test Quick Checks

    Noise Diagnostic Procedure

    Road Conditions

    Power Steering Conditions

    Power Steering Operation Noise Check

    Symptom Chart

    Pinpoint Tests

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