Okbas an update for yall. They called me and said it was normal...so I went to pick up the car and it was louder than before so they did two things. Brought a new sonic with close to same milage and sat them next to eachother and the new car didnt do it. Then thier sinior teck came and listened and said it wasnt doing that before and took it back. Im now in the rental again and they said they will call me with an ipdate of whats going on. After work I plan to go up there and see if anything has changed. But from the sound it sounded internal and bad so probanly looking at getting a different car.
Ok so they called back...they said that they called gm who told them to jold on it because they say a little rod knock is ok....wft?!?!?!
This is how my engine sounds at idle once at operating temperature . Let me know if it is similar to you issue . Chevrolet sonic knocking at idle - YouTube