Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
Tire Force Vibration
A tire vibration caused by variations in the construction of the tire that is noticeable when the tire rotates against the pavement. This condition can be
present on perfectly round tires because of variations in the inner tire construction. This condition can occur at wheel rotation frequency or twice rotation
frequency.
Transient
Momentary, short duration.
Two-Plane Balance
Radial and lateral balance.
Vibration
Any motion, shaking or trembling, that can be felt or seen when an object moves back and forth or up and down.
Whine
A constant, high-pitched noise. Also described as a screech.
Whistle
High-pitched noise (above 500Hz) with a very narrow frequency band. Examples of whistle noises are a turbocharger or airflow around an antenna.
Wind Noise
Any noise caused by air movement in, out or around the vehicle.
WOT
Wide-open throttle
Tools and Techniques
Electronic Vibration Analyzer (EVA)
The EVA is a hand-held electronic diagnostic tool which will assist in locating the source of unacceptable vibrations. The vibration sensor can be
remotely mounted anywhere in the vehicle for testing purposes. The unit displays the three most common vibration frequencies and their corresponding
amplitudes simultaneously. A bar graph provides a visual reference of the relative signal strength (amplitude) of each vibration being displayed and its
relative G force. The keypad is arranged to make the EVA simple to program and use. Some of the functions include the ability to average readings as
well as record, play back and freeze readings. The EVA has a strobe balancing function that can be used to detect imbalance on rotating components
such as a driveshaft or engine accessories.
