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Turbocharger Whine Noise

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Turbocharger Whine Noise

Condition Action
Some whine noise is normal. Compare to a known good vehicle.
Leaking charge air cooler/pipes/hoses Inspect for leaks in charge air cooler/pipes/hoses using J 46091  .
Worn turbocharger bearings Visually inspect for evidence of compressor wheel to housing contact.
If the turbocharger bearings are worn or damaged, inspect for a Turbocharger Lack of Oil Supply .
Intake system leaks or obstructions Inspect for leaks or obstructions in the intake manifolds.
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