Symptoms - Engine Exhaust: Intermittent
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating as designed. See TESTING FOR INTERMITTENT AND POOR CONNECTIONS .