We finally went on a long trip with the cts. the first regen I missed at about 35 soot level but the next one happened going 70MPH at 43 soot level At first I thought I had a bad tire, a low thumping noise and I could feel it. It was random, not like a tire which is constant and lasted 1 minute and thumped about 4 times. Had to be the fuel lighting off AFTER the cat? It did not sound good! Anybody else have this?
Yeah, I have noticed a similar throbbing sound during regen at certain speeds. I think it's normal as others have reported similar sounds.
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