Question about 2006 Buick LaCrosse

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When started each morning there is a loud sound (vibration) until the engine warms up. it then disappears until the next morning

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It may be an exhaust shield that is loose on the exhaust system. The shield is added to the exhaust to prevent a hot surface from touching something flammable when the vehicle is parked after shut down. It will not cause a leak, but it can create the problem you are experiencing, just a thought. This is all I can post for a solution after reading the info you gave. Also check the exhaust mounts.

Posted on Nov 13, 2010

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