Hmmm. This is not something that one wants to get wrong. This is an 'interference' engine, and valve timing gone bad will wreck valves/head.
There are timing marks on the crankshaft sheave and on the camshaft drive. (Basically, this is done with the engine at top dead center. I don't think the pictures are that good on this site - i'm not sure you could see if I copied and pasted - but crash around the internet and, depending how computer-ish you are, you will find A4 manuals that show these marks. (The official Audi 'manual' is called ETKA and is killer huge. There are some copies of Bentley manual sections kicking around. There is a copy or two of the Haynes manual...) While you are getting the manual parts that show the marks, you will also get a diagram that shows the crankshaft rotation.
Once you have the marks (and make sure and then make sure again, and then make sure a third time that you do) the 'tight' side of the belt is the one on which the crankshaft rotation 'pulls' the camshaft, and the 'tensioner' side of the belt is the one on which the rest of the belt heads back up to the camshaft. So you have the timing right when the marks are where they are supposed to be when the tight side of the belt is tight.
When you have it right, but only after you have it right, and you are sure, then pull the pin that releases the tensioner - and puts tension on that side of the timing belt. (It is possible to recover the tensioner and re-set the belt if you have pulled the pin too soon, but it is not fun).
SOURCE: setting the timing belt
you do not need a new belt seeing it was replaced, setting the timing should solve the problem,however this is something that should be done by a good mechanic.
SOURCE: 2002 mazda poetege> correct timing mark alignment.
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528019f906
there are other diagrams on that page if this is not the right one.
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