If you are having the tick and your local deal won't fix it. Go to another dealer. The early 06 3.3L have a timing chain tensioner that cause the chains to rattle. This is a known issue. Depending on how many miles you have on it. You might also need chains and guides. The tensioners alow the chains to slap so much that they stretch. At the shop just this month we have replaced chains and guides on 7 cars with same problem.