Pinpoint Test F: Drumming Noise

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

Test Step

F1 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.
- Add approximately 9 kg (20 lb) of weight to the exhaust system. First place the weight at the tail pipe and test, then place it at the front pipe.
  
  Fig 1: Checking Exhaust System (Pinpoint Test F1)
  Courtesy of FORD MOTOR CO.
- 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 : CARRY OUT Exhaust System Neutralizing. See EXHAUST SYSTEM NEUTRALIZING . TEST the system for normal operation.
  2. No : GO to F2.
F2 POWERTRAIN/DRIVETRAIN MOUNT NEUTRALIZING
- See POWERTRAIN/DRIVETRAIN MOUNT NEUTRALIZING . Test the system for normal operation.
- Is the noise reduced or eliminated?
  1. Yes : Vehicle OK. TEST the system for normal operation.
  2. No : CONDUCT diagnosis of other suspect components.