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My 2012 Buick Enclave 3.6 V-6 did that - ran rich for about 30 seconds on a cold start - smoked a little black and had a strange exhaust note too - cat light-off was the reason, as you have found.

and now for something completely different If enough geezers forget to push the start button to shut down when done driving, the NHTSB will probably mandate an interlock that will lock the doors until you shut the engine down. Think I'm kidding? The fed gov nannies never sleep. Damn the...

Rock the DIC I just knew you'd find them - congrats ... Glenn