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Mazda 2.0L \  whistling/whining noise

whistling/whining noise

Mazda 2.0L Mazda Engine Mazda Tech
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jenko   +1y
The tensioner is automatic so the tension "should" be correct.
How long has it been since a belt/tensioner replacement?

I do both when I change a belt... most times you don't really need to but it's prudent to do so.
(it does feel wrong throwing out something that you can see is still pretty damn happy though )
It's only a spring holding tension, not like a mechanical screw type adjuster, it won't be super tight.
It's just got to stop it from slipping teeth.

As long as you're thinking we're happy with any questions