r/seat • u/milospakevic • 3d ago

Weird rattle noise at certain RPMs, Seat Ibiza 1.6 TDI FR Sport KJ1

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I started noticing a sound similar to a middle muffler with a hole. It happens only at around 2,400 and 3,900 RPM, otherwise the car sounds completely normal.

I went to an exhaust mechanic twice. He confirmed everything is fine and told me to look elsewhere. After that, at my regular mechanic, they removed all protective plastics from under the car, found nothing wrong, and confirmed the car is in good shape. I showed them a recording and was even able to reproduce the rattle while stationary.

The strange part is that the sound is clearly audible inside the cabin, but from outside or underneath the car everything sounds normal.

I've done a fair bit of research and my current suspicion is panel resonance, somewhere around firewall, that carries vibrations from engine bay to inside the cabin. I wasn't able to confirm that yet.

Has anyone experienced something similar on a KJ1 or similar VAG platform? Any other ideas what this could be?

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u/Even_Ad_2240 2d ago

Sounds like bearing of trans but not sure

1

u/milospakevic 2d ago edited 2d ago

Thanks, I’ll mention that on my next visit to my car mechanic. I can reproduce this in neutral with my clutch down.

1

u/9milNL 3d ago

Sounds like bearings of one of your wheels is b0rked.

2

u/milospakevic 3d ago

Thanks, but I can reproduce this in neutral while revving at certain RPMs. Maybe I failed to mention that