Road Test

A tire vibration diagnostic procedure always begins with a road test. The road test and customer interview (if available) will provide much of the information needed to find the source of a vibration

During the road test, drive the vehicle on a road that is smooth and free of undulations. If vibration is apparent, note and record the following:

• The speed at which the vibration occurs
• What type of vibration occurs in each speed range
  • Mechanical or audible
• How the vibration is affected by changes in the following:
  • Engine torque
  • Vehicle speed
  • Engine speed
• Type of vibration-sensitivity: torque sensitive, vehicle speed sensitive or engine speed sensitive

The following explanations help isolate the source of the vibration