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Originally Posted by Deserion
Can anyone offer some insight into the sounds?
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BANG!!! (j/k)
I don't think anyone who's suffered from IMS failure heard any type of "death rattle" before the event occured. I've read many of the threads and don't recall anyone saying there was some sort of sound before it happened. They generally were driving along just fine and then their engine quietly stops and won't restart.
I think 986's have a panel near the exhaust that works loose and nestles up to the exhaust. Then when your car is warming up and the exhaust is shaking a bit, the panel rattles. Good chance this is what you're hearing. Brumos would be able to diagnos this issue but they can't tell you anything about the shape of your IMS without tearing into your engine.
It's good that you're having the IMS upgrade done, but relax and enjoy your Box until then.