Do these still have a habit of failing. My sister has a 2009 genesis that every morning on the first cold start it has a terrible can of marbles sound for about 10 seconds or so then goes away. I'm suspecting it's the timing chain tensioner, it fits the scenario. Anyone have some comments. It has 84000 miles on it.
It maybe the intake cam gears also and its very difficult to find information about these defects. I'm in the process of replacing the intake sprockets and cams to fix the factory defect on the 3.8 lambda engine produced before july11.2010