Mustang GT V8-4.6L SOHC VIN X (1998)
Vehicle Speed Sensitive
This means the vibration always occurs at the same vehicle speed and is not affected by engine torque, engine rpm, or the transmission gear selected.
Engine Speed Sensitive
This means the vibration occurs at varying vehicle speeds when a different transmission gear is selected. It can sometimes be isolated by increasing or
decreasing engine speed with the transmission in NEUTRAL or by stall testing with the transmission in gear. If the condition is engine speed sensitive,
the cause is probably not related to the tires.
If the road test indicates there is tire whine, but no shake or vibration, the noise originates with the contact between the tire and the road surface.
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A thumping noise usually means the tire is flat or has soft spots making a noise as they slap the roadway. Tire whine can be distinguished from
axle noise. Axle noise diminishes or changes according to load or speed. Tire whine remains the same over a range of speeds.
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CAUTION: Be sure to deflate tires to their proper pressures after this check is completed. Overinflated tires will adversely affect vehicle
handling.
To verify the tire noise is not associated with shake or vibration, inflate the tires one at a time to 345 kPa (50 psi) and check for a change in the sound.
