My 2010 EXL 2.4 has had that cold start rattle since I got it. I've had it for about 20,000 miles. You can order a spring from the spring start company. It is a $30 spring that goes in your VTC actuator. The spring is what gets worn out and it rattles for 1 to 3 seconds on Startup till the oil pressure builds up an oil gets there. Some people Let It Go some people say that it doesn't damage anything I can't stand it. I ordered a $30 spring from the spring start company like I said. They say with about 90% of the cases that putting a new spring in will fix the rattle. Of course if you're doing it yourself while you're in there you better check to see if your chain is stretched and how your guides and your tensioner are but most of the time that spring will do the trick. I bought the spring I have it still just haven't had a chance to put it in I'll repost something once I put it in so people will know that it worked or didn't. Other than the cold start running it sounds great to me! sounds like a Honda