For two days now my car is a bit loud when starting and driving, especially when I back off the gas. Then when the engine warms up it is quiet. This has me baffled. Could it be a bad manifold gasket or something worse?
Unless you have driven a lot of miles since you bought the car, the engine should still be covered by the 5 year/60k mile Powertrain Warranty. I suggest that you leave the car at the dealership overnight, and then have a mechanic observe/listen when you first start the engine in the morning.
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Although this probably isn’t the issue, have you made sure the oil is at the correct level?
No the oil is fine. I bought the car used and have barely put on 4,000 miles. It’s just a little under 40,000.
Does sound like a leak in the exhaust - maybe a loose exhaust manifold or a cracked one. Once heated up the gap closes. Warranty.
Thank you this confirms what I was thinking but going to take it to the dealer.