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Pinpoint Test A: Drumming Noise

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK THE EXHAUST SYSTEM 
    • Key in START position.
    • Increase the engine RPM until the noise is the loudest. Note the engine RPM.
    • Key in OFF position.
      • Fig 1: Locating Tail Pipe & Front Pipe
      GF0000027Courtesy of FORD MOTOR CO.
    • Add approximately 9 kg (20 lb) of weight to the exhaust system. First place the weight at the tailpipe and test, then at the front pipe.
    • Key in START position.
    • Increase the engine RPM and listen for the drumming noise. Note the engine RPM if the noise occurs.
    • Key in OFF position.
    • Using a vibration analyzer (VA), determine the amount of vibration that occurs with the drumming noise.
    • Is the noise/vibration reduced or eliminated, or does the noise/vibration occur at a different RPM? 
    1. YES  : REFER to Exhaust System Alignment . TEST the system for normal operation.
    2. NO  : CONDUCT a diagnosis on other suspect systems. REFER to DIAGNOSTIC TESTS article.
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