Your Vehicle: 2001 Ford Escort ZX2 L4-2.0L DOHC VIN 3
Vehicle » Testing and Inspection » Symptom Related Diagnostic Procedures » 3: Preparing for the Road Test  
  3: Preparing for the Road Test  

Observe the following when preparing for the road test:

  • Review the information recorded on the NVH Diagnostic Guide. It is important to know the specific concern the customer has with the vehicle.
  • Do not be misled by the reported location of the noise/vibration. The cause can actually be some distance away.
  • Remember that the vibrating source component (originator) may only generate a small vibration. This small vibration can in turn cause a larger vibration/noise to emanate from another receiving component (reactor), due to contact with other components (transfer path).
  • Conduct the road test on a quiet street where it is safe to duplicate the vibration/noise. The ideal testing route is an open, low-traffic area where it is possible to operate the vehicle at the speed in which the condition occurs.
  • If possible, lower the radio antenna in order to minimize turbulence. Identify anything that could potentially make noise or be a source of wind noise. Inspect the vehicle for add-on items that create vibration/noise. Turn off the radio and the heating and cooling system blower.
  • The engine speed is an important factor in arriving at a final conclusion. Therefore, connect an accurate tachometer to the engine, even if the vehicle has a tachometer. Use a tachometer that has clearly defined increments of less than 50 rpm . This ensures an exact engine speed reading.