Road Test

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.