Noisy exhaust at first start up. Quiets to normal after 1/2 to 1 mile. What is the cause?

Asked by Jul 10, 2014 at 05:38 PM about the 2008 Chevrolet TrailBlazer

Question type: Maintenance & Repair

Noisy exhaust at first start up. Quiets to normal after 1/2 to 1 mile. What is the cause?

1 Answer

257,895

Probably an exhaust leak, once it warms up, it expands and closes off.

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