GTO V8-6.0L VIN U (2005)
proceed further in this table.
3. The noise may be an internal engine noise. Remove the drive belts and operate the engine for a few seconds, this will verify if the squealing noise
is related to the drive belts or an accessory drive component. With the drive belts removed the water pump will not operate and the engine may
overheat. Also diagnostic trouble codes (DTCs) may set when the engine is operated with the drive belts removed.
4. This test is to verify that an accessory drive components does not have a seized bearing. With the belts removed, test the bearings in the accessory
drive components for smooth operation. Also test the accessory drive components with the engine operating by varying the load on the accessory
drive components to verify that the components is operating properly.
5. This test is to verify that the drive belts tensioners is operating properly. If the drive belts tensioners is not operating properly, proper belt tension
may not be achieved to keep the drive belt from slipping which could cause a belt squeal noise.
6. This test is to verify that the drive belts is not too long, which would prevent the drive belts tensioners from operating properly. Also if the
incorrect length drive belts was installed, it may not be routed correctly and may be turning an accessory drive component in the incorrect
direction.
7. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of a accessory drive component, or
the pulley is bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across 2 or 3
pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for that pulley.
8. Inspect the accessory drive pulleys to verify that they are the correct diameter or width. Using a known good vehicle, compare the pulley sizes.
Drive Belt Vibration
Drive Belt Vibration Diagnosis
