Engine Low Power, Whistling-Type Noise from Engine (Replace Turbo to Charge Air Cooler Hose Clamp)

This bulletin is being revised to add the 2007 model year. Please discard Corporate Bulletin Number 05-06-93-001 (Section 06 -- Engine/Propulsion System).

Under certain circumstances, some customers may comment on an engine low power condition and/or a whistle-type noise coming from the engine area while driving.

The charge air cooler pipe may have become disconnected at the turbocharger compressor housing. There may be insufficient clamping on the rubber hose between the compressor housing and the charge air cooler pipe. When the turbo boost pressure is at maximum, this hose connection can come apart.

1. Verify that the turbo hose has become disconnected.
2. Inspect the turbo hose for any distortion or oily contaminates. If either is present, replace the hose assembly.
3. Ensure that the turbo compressor housing flange is free from any oil residue.

Important: When installing the new clamp, position the clamp forward of the bulge and align correctly to maximize the full retaining power. If the clamp is improperly installed, the turbo hose may become disconnected and could cause a repeat condition.

4. Install the hose completely onto the turbocharger and replace the original clamp with a new clamp.

Tighten
Tighten the clamp to 5 N·m (50 lb in).

Important: When the turbocharger hose connection becomes disconnected, the pressure in the turbo will change, causing oil to be pulled past the housing seal. This is a normal condition and the turbocharger should not be replaced.

For Chevrolet and GMC Models

For Isuzu Models

Parts are to be obtained from AIPDN.

For vehicles repaired under warranty, use: