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You may or may not need a tensioner. I decided not to replace mine since it felt and sounded absolutely perfect and better than the replacement.
My mechanic won't install parts that I bring him. It is their policy. And I understand. Mechanics make some of their money on the parts, and they make sure that you get the right ones. A good mechanic is much more valuable than saving a couple of bucks on belts, in my opinion. I am sure the dealer won't miss a couple of bucks, but the shop I bring my car to has only a few employees. Plus the parts necessary to do the timing belt are pretty cheap, even from your mechanic. The expense is the labor.
If you have an 8 valve engine (NOT a 16 valve) and like some adventure (or don't travel too far from home) and have AAA then you could wait on the timing belt until you have the $. It won't hurt the engine to have it break while driving and will be the same price to replace. In my experience, each of two timimg belts lasted at least 80K. (One broke and the other didn't). I assume that if your car has 100K then it has been changed at least once. When you do change the timimg belt, I would also change the water pump (most recommend every 100K). Do all the belts when you do the timimg belt. Otherwise the other belts can wait as well until they start squeaking, cracking or break - again if you like adventure.
Definately do the flame trap and I would clean the throttle body and idle air control valve - cheap and you will like the way your car drives. Actually, you could wait on the latter two, but do the flame trap to help prevent oil leaks.
-Steve
Durham, NC
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