There���s a constant tapping I hear in my Enclave���s engine and I asked about it within the first 2 days of owning it. The service department determined last week that it was a noise from the purge valve and that the vehicle is safe to drive. They did thorough work to determine what the cause was. They even switched it out with a new one from a different Enclave to see if it would be quieter. They determined that nothing is wrong with it, and it���s just the way that it sounds. Im grateful they took the time to figure out the problem. I���m just frustrated that I have a brand new vehicle that makes an annoying sound. It���s discouraging to save up money and make a large purchase, then learn quickly there is something annoying about it. Last week we even asked the salesman if there was an option to have the dealership buy back the vehicle. We looked into it and it would be an enormous financial loss for us and just not an option. So I���m stuck with a vehicle for the next 10 years or so that annoys me, and I���m trying to accept that there���s nothing we can do about it. I���ve read online that this is common for GM engines and they confirm that it���s an annoyance but not a problem with function or safety. I don���t understand how a company can have a long standing annoying issue without an option to resolve it. I recognize that there may not be anything the service department can help with any more... it may be a larger issue with GM and not Van Devere. It���s still frustrating.