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2019 Mazda Mazda3 — ticking noise follows RPM but fades when warm

TrailMechanicish660Community StarterNov 19, 20252019 Mazda Mazda3 PreferredColumbus
There is a light ticking sound that follows engine speed for the first few minutes and then becomes hard to hear. Oil level is correct. How would you separate normal injector noise from valvetrain noise?
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WeekendGuy384Community StarterCommunity StarterNov 19, 2025permalink
Ask what changed right before it started. Capture voltage while the 2019 Mazda Mazda3 is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. This is from a 2019 Mazda Mazda3 in Columbus. No need to make it theatrical. A day of patience here is cheaper than a wrong part. Parking it somewhere I can hear it better next time.
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