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Isolation Test Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Perform the following test in order to determine if force variation is present in the vehicle.

  1. Substitute a set of KNOWN GOOD - pre-tested - tire and wheel assemblies of the same size and type for the suspected original assemblies. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  2. Road test the vehicle to determine if the vibration is still present. Refer to Vibration Analysis - Road Testing .
  3. If the vibration is still present while using the known good set of tire and wheel assemblies, then force variation is not the cause of the vibration.
  4. If the vibration is eliminated when using the known good set of tire and wheel assemblies, install one of the original tire and wheel assemblies using the matchmarks made prior to removal. Refer to Tire and Wheel Removal and Installation in Tires and Wheels. Road test the vehicle to determine if the vibration has returned. Refer to Vibration Analysis - Road Testing .
  5. Continue the process of installing the original tire and wheel assemblies one at a time, then road testing the vehicle, until the tire and wheel assembly, or assemblies which is causing the vibration has been identified.
  6. Replace the tire, or tires on the vibration-causing tire and wheel assembly, or assemblies, then balance the assembly, or assemblies. Refer to Tire and Wheel Assembly Balancing - Off-Vehicle .
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