Hello,

My Octavia is a November 2021 build, 1.5 TSi M-Hev, DSG.

I am struggling with the following issue since this winter, when I discovered some rattling noises coming from the engine while the car was idling at 750/850 rpm.

Also, small vibrations are felt in the car while the rattling noises happen (or when the speed of the assembly is reduced as it can be seen in the recording below).

The issue isn't seen/felt if the A/C is on and the engine idle goes up to 900-1000 RPM, everything goes smooth then.

Went to the dealer for looking into the issue: they first changed a hose, then an engine mount. However these things never fixed the issue.

After providing them the video above, they looked beyond the intake manifold where they said they saw carbon deposits on the intake valves and 2 fuel injectors not working as expected.

They performed walnut blasting on the intake valves, then they replaced faulty fuel injectors (2 and 4).

They said that they performed the needed software changes after this and they tested the car in a drive-test for about 20 kilometers concluding that the car was OK.

Got the car, drove it home with seeing any issues.

Starting the car the very next day, the same behavior is observed.

Worth mentioning the following:

• noise and vibrations are seen/felt even if the engine is cold, even if the engine is in working temperature.

• the car isn't struggling to accelerate or "kangaroos" during the acceleration - it works perfectly fine when I am speeding up.

Is this the normal way of working on this engine after some time?

If not, has anyone faced this problem before on this engine? Was it fixed?

Any reply helps...

Thanks!

Edited 16 April, 20251 yr by Jugaroo

No idea, but did the car get new spark plugs as per VW Group / Skoda recommendation, guidance, specification, serviceregime, @4 years / 40,000 miles?

this tensioner is dancing too much i see..

1 hour ago, Ootohere said:

No idea, but did the car get new spark plugs as per VW Group / Skoda recommendation, guidance, specification, serviceregime, @4 years / 40,000 miles?

Yes.

At exactly 55k km.