Operating Condition - Vehicle Is Moving

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

Depends more on how the vehicle is operated
1. Speed related
  - Related to vehicle speed
    - Pitch increases with vehicle speed. GO to SYMPTOM CHARTS .
    - Noise occurs at specific vehicle speed. A high-pitched noise (whine). GO to SYMPTOM CHARTS .
    - Loudness proportional to vehicle speed. Low-frequency noise at high speeds, noise and loudness increase with speed. GO to SYMPTOM CHARTS .
    - A low-pitched noise (drumming). GO to SYMPTOM CHARTS .
    - Vibration occurs at a particular speed (mph) regardless of acceleration or deceleration. GO to SYMPTOM CHARTS .
    - Noise varies with wind/vehicle speed and direction. GO to SYMPTOM CHARTS .
  - Related to engine speed.
    - Noise varies with engine rpm. GO to SYMPTOM CHARTS .
    - Vibration occurs at a particular speed (mph) regardless of engine speed (rpm).
Acceleration
- Wide open throttle (WOT)
  - Engine induced contact between components. Inspect and repair as necessary.
  - Noise is continuous throughout WOT. Exhaust system or engine ground out. GO to SYMPTOM CHARTS .
- Light/moderate acceleration
  - Tip-in moan. Engine/exhaust noise. GO to SYMPTOM CHARTS .
  - Knock-type noise. GO to SYMPTOM CHARTS .
  - Driveline shudder. GO to SYMPTOM CHARTS .
  - Engine vibration. GO to SYMPTOM CHARTS .
Turning noise GO to SYMPTOM CHARTS .
Braking
- Clicking sound is signaling ABS is active. Acceptable ABS sound.
  - A continuous grinding/squeal. GO to SYMPTOM CHARTS .
  - Brake vibration/shudder. GO to SYMPTOM CHARTS .
Shifting
- Noise or vibration condition related to the transmission (automatic). GO to SYMPTOM CHARTS .
Cruising speeds
- Accelerator pedal vibration. GO to SYMPTOM CHARTS .
- Driveline vibration. GO to SYMPTOM CHARTS .
- A shimmy or shake. GO to SYMPTOM CHARTS .
Driving at low/medium speeds
- A wobble or shudder. GO to SYMPTOM CHARTS .
Depends more on where the vehicle is operated
1. Bump/pothole, rough road or smooth road. GO to SYMPTOM CHARTS .
  - Noise is random or intermittent occurring from road irregularities. GO to SYMPTOM CHARTS .
  - Noise or vibration changes from one road surface to another. Normal sound changes.
  - Noise or vibration associated with a hard/firm ride. GO to SYMPTOM CHARTS .