Hey Scotty, I have a 2005 Honda Odyssey that makes a loud rattling and grinding sound after cold…

Hey Scotty, I have a 2005 Honda Odyssey that makes a loud rattling and grinding sound after cold starts, and while accelerating.
I think it's a bad belt tensioner.
How long can I go before the belt breaks, do you think?
I've put 8,000 miles on the car since I noticed the noise.

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