Noisy Turbo

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Dirt or debris in the compressor housing
Air leaks in ducting or hoses
Clogged or restricted ducting
Insufficient Lubrication for Turbocharger
Exhaust Manifold leaking
Severe Exhaust restriction
Oil contamination
Failure to Pre-Lubricate Turbocharger at installation and per instructions
Turbocharger Mounting
Turbocharger Housing
1) Remove air intake duct from turbo and inspect inside the wheel vane area for foreign material such as metal or hardware, air filtration material, leaves or dirt. Clean accordingly.
2) Review vanes on compressor wheel for worn or damaged tips. If damaged replace turbo.