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My timing belt had jumped about 10 teeth at 155 k miles, the exact cause still unknown, the tensioner checked out OK - no
rust, compressed slowly and with sufficient force.
Approximately a month before that engine started developing a loud knock when cold, but would go away during warm-up.
Knock was getting stronger and lasting longer, until one day
the car refused to start.
All I did was to put back the belt back in its place. The old belt, the old tensioner. The knocks ended after I changed oil (I guess bad oil batch - was only 2.5k miles on the old oil). 10k miles later
still going without any noticeable ill effects.
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