I just bought a 2013 volvo s60 t5 about two weeks ago. When I started the engine in a cold morning, the engine misfires and rumbles for about 5 to 10 seconds.
It has been happening every morning when the temperature is below 50 degree, and it happens only the first time you start the engine.
After the first time, everything is fine.
I brought the car to a volvo dealer, they did all the testings and did not find anything wrong. they contacted volvo support and was suggested to upgrade ECM software 36004-2.3. but the problem still exists after the software upgrade.