F 350 2WD Pickup V8-460 7.5L VIN G EFI (1997)
^
Verify the "symptom".
^
Determine which "system(s)" can cause the "symptom".
-
If a vibration concern is vehicle speed related. the tire and wheel rpm/frequency or driveshaft frequency should be calculated.
-
If a vibration concern is engine speed related. the engine, engine accessory or engine firing frequencies should be calculated.
^
After determining the "system", use the diagnostic tools to identify the worn or damaged 'components".
^
After identifying the "components". try to find the "cause" of the failure.
Once the concern is narrowed down to a symptom/condition. proceed to NVH Condition and Symptom Categories.
Operating Condition - Vehicle Is Not Moving
1.
Static operation
^
Noise occurs during part/system functioning.
GO to Symptom Chart - Squeak and Rattle.
2.
While cranking
1.
Grinding or whine, differential ring gear or starter motor pinion noise. GO to Symptom Chart - Engine Noise/Vibration.
2.
Rattle. Exhaust hanger, exhaust heat shield or A/C line noise. GO to Symptom Chart - Squeak and Rattle.
3.
Vibration. Acceptable condition.
3.
At idle
^
Idle noise. GO to Symptom Chart - Idle
Noise/Vibration.
^
Idle vibration or shake. GO to Symptom
Chart - Idle Noise/Vibration.
4.
During Gear Selection
1.
Vehicle parked on a steep incline. Acceptable
noise.
2.
Vehicle parked on a flat surface. GO to Symptom Chart - Driveline Noise/Vibration.
3.
Vehicle with a manual transmission. GO to Symptom Chart - Transmission (Manual) and Transfer Case Noise/Vibration.
Operating Condition - Vehicle Is Moving
1.
Depends more on how the vehicle is operated
1.
Speed related
^
Related to vehicle speed
-
Pitch increases with vehicle speed. GO
to Symptom Chart - Tire
Noise/Vibration.
-
Noise occurs at specific vehicle speed.
A high-pitch noise (whine). GO to
Symptom Chart - Driveline
Noise/Vibration.
-
Loudness proportional to vehicle
speed. Low-frequency noise at high
speeds, noise and loudness increase
with speed. GO to Symptom Chart -
Driveline Noise/Vibration.