Absolutely, the belt tensioner will cause a rattle when the engine is first started. It can also rattle every time the engine is raised from idle with a load on it. My old 2.3 was horrendous. Simply replacing the shock won't fix it. My 2.8 is making the same noise on startup and in the last few days is starting a little rattle off idle. It has nothing to do with the camchain. It has been replaced as a maintenance item recently with no effect on that rattle. I know I will have to do the belt tensioner very soon.
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