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Inspection and Verification - Engine NVH: Notes

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  1. Identify the engine NVH symptoms using the available diagnostic tools and techniques. For a list of these techniques, tools, an explanation of their uses and a glossary of common terms, refer to NOISE, VIBRATION & HARSHNESS .
  2. Verify the customer concern.
  3. Inspect the engine for installation of an aftermarket oil filter. Review oil and filter maintenance history to make sure the vehicle has not gone beyond the standard Ford recommended oil change interval.
  4. Check the engine oil level and check the oil for contamination. Low engine oil level or contaminated oil are common causes of engine noise. If the oil is contaminated the source of the contamination must be identified and repaired as necessary.
  5. Visually inspect for obvious signs of mechanical damage.
    VISUAL INSPECTION CHART

    Mechanical
    • Loose mounting bolts, studs and nuts
    • Damaged powertrain mounts
    • Damaged or disconnected vacuum hoses
    • Damaged or disconnected air intake components
    • Obstruction of cooling fan
    • Obstruction of Front End Accessory Drive (FEAD)
  6. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  7. NOTE: Make sure to use the latest scan tool software release.

    If the cause is not visually evident, connect the scan tool to the DLC.

  8. NOTE: The VCM LED prove out confirms power and ground from the DLC are provided to the VCM.

    If the scan tool does not communicate with the VCM:

    • check the VCM connection to the vehicle.
    • check the scan tool connection to the VCM.
    • refer to MODULE COMMUNICATIONS NETWORK , No Power To The Scan Tool, to diagnose no power to the scan tool.
  9. If the scan tool does not communicate with the vehicle:
    • verify the ignition key is in the ON position.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK , The PCM Does Not Respond To The Scan Tool, to diagnose no response from the PCM.
  10. Carry out the network test.
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK .
    • If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  11. Clear the continuous DTCs and carry out the self-test diagnostics for the PCM.
  12. If the DTCs retrieved are related to the concern, refer to ELECTRONIC ENGINE CONTROLS - DIESEL ENGINES .
  13. If no DTCs related to the concern are retrieved, continue the inspection and verification if a noise concern is related to the engine. For vibration concerns and noise concerns such as powertrain mounts, air intake system and starter, GO to SYMPTOM CHART - ENGINE NVH .

In some cases, a noise may be a normal characteristic of that engine type. In other cases, the noise may require further investigation. Comparing the noise to a similar year/model vehicle equipped with the same engine will aid in determining if the noise is normal or abnormal.

Once a customer concern has been identified as an abnormal engine noise, it is critical to determine the location of the specific noise. Use the EngineEAR/ChassisEAR or stethoscope (the noise will always be louder the closer you get to the noise source) to isolate the location of the noise to one of the following areas.

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