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As for the cold start noise. Also having my car for a year and buying in October and being in Florida I didn't have this occur until temp. Outside was under 68 degrees and Florida that doesn't occur till later. Well I get out to then my new car start it and within first 2 minutes of start and you don't have to be moving it starts this knocking that sounds like from rear passenger side slow then fast faster faster then fades out. On,y on start only on cold start and only for first 2 to 3 minutes of starting car from sitting over night. I leave car. Can replicate. Then I get it to do it one day with tech in my car for another issue. Oh sorry that tech was for your other issue. Lol. Year later starting to cool off and again starting to knock. Either fuel pump or exhaust resonator not sure what but I'm sure gm does so can you gm reps that keep us calm and help us please give me the bulitine number so I can get this fixed please.
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