You have a number of unrelated problems here and we cannot address multiple issues within one question because it becomes way too confusing to follow. You should ask separate questions for the other issues.
I will try to address the knocking noise here.
You description is rather vague as to where it's coming from but the first thing to check is to see if the can is contacting the shroud, possibly due to a broken motor mount allowing the engine to shift.
Thursday, January 31st, 2013 AT 11:51 PM