3.6L LY7 Engine - Rattle Noise Coming from the Engine - kw bushing intake manifold mechanical performance valve

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

The concern is a rattle noise coming from the engine.

Disconnecting the intake manifold tuning valve could eliminate the rattle noise. If the replacement of the intake manifold tuning valve did not change the noise, the correction is to replace the upper intake manifold because the bushing for the intake manifold tuning valve was missing.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(2004 Cadillac CTS) and 2004 Cadillac SRX)

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