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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1238 (Noise, Vibration And Harshness -- Excursion & F250-F550 Super Duty) >> Diagnosis And Testing >> Noise, Vibration and Harshness (NVH) >> Pinpoint Tests >> Pinpoint Test F: Drumming Noise

Pinpoint Test F: Drumming Noise

WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 at the front pipe.
      Fig 1: Identifying Tail Pipe And Front Pipe
      G04025991Courtesy 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 an electronic vibration analyzer (EVA), 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? 
    • Yes  : CARRY OUT Exhaust System Neutralizing. TEST the system for normal operation.
    • No  :GO to F2.
  2. F2 POWERTRAIN/DRIVETRAIN MOUNT NEUTRALIZING 
    • Carry out Powertrain/Drivetrain Mount Neutralizing. Test the system for normal operation.
    • Is the noise reduced or eliminated?
    • Yes  : Vehicle OK. TEST the system for normal operation.
    • No  :CONDUCT diagnosis of other suspect components.
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