Hi, I've had my 2011 EE20 for a few months and I get a clattering noise when feathering the throttle whilst driving. If it were a petrol engine then I could only describe the noise as loud pinking sound. Surely this is not normal. I was also told to check EGR valve which I will this weekend. My forester has done almost 92k miles. Any more ideas as to what noise is would be great...