Hi everybody, I recently noticed a tapping noise on my 2010 Octavia when on high gears and it goes away when i step on the gas and reduce to a lower gear. I feel it's maybe overheating even though the the gauge doesn't get above the half mark because this noise disappears in the morning and comes back as soon as the engine starts getting hot. Any ideas please?

Welcome to the forums, you might get a wider audience and a better answer posting this in the Octavia topics. Maybe a mod could move this for you.

Diesel or petrol engine, and which version, eg 1.9PD or 1.8TSI?

It's a 1.6 mpi petrol engine.

I'll move this to where it should get more replies.

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DMF flywheel problems?

Hi and welcome aboard.

Sounds like it could be pinking. What grade of petrol (octane rating) are you using?

Pinking or pre ignition will disappear instantly when you lift off the gas pedal/accelerator. Dual mass flywheel tapping is a heavier vibration(IIRC).

Try a better grade (higher octane) of fuel or have the ignition timing retarded if that can still be done.