Hello There,

For a couple of months my 2005 Octavia Vrs (Mk1) has been emitting a "Tapping" like noise (To give you a better idea the noise sounds very similar to an exhaust pipe cooling down, i.e. Light "Ting") when the car is operating at low rpms under load. For example when in 3rd Gear @ 35mph when the throttle is put on this noise is initiated and only stops once the turbo kicks into stride. At high RPM the noise is non existent.

To cut a long story short the dealer that I have purchased this car from has not been very helpful and had only brushed over the car with the Diagnostics kit and came to the conclusion that the computer says the car is fine! However I know this noise is not right and was certainly not there when I bought it several thousand miles ago (The Cars total mileage is only sitting at 23,500 miles). At this current time the dealer gives the impression that they do not wish to cooperate in pursuing this in a more technical manner, this is frustrating as the car is still under warranty for another 3 months with the dealer I purchased the car from.

Any helpful advice would be very much appreciated as I’m worried this problem could be something serious (Also the fact it’s not pleasant to listen to).

Thank You

Edited 11 February, 201115 yr by vrs loyal

Heat shield on the exhaust/cat rattling slightly as the engine is under load?

Agreed.

I should add, it is not uncommon for the spot welds to fail which causes this.

Just brainstorming a little, but would a heatshield be the case if it only happens at low rpm's and before the turbo was to kick in. If so what would cause the rattle to cease at that point?

low revs in the wrong (ie. too high) gear would labour the engine more, and thus cause more vibration from it.

Just brainstorming a little, but would a heatshield be the case if it only happens at low rpm's and before the turbo was to kick in. If so what would cause the rattle to cease at that point?

YES it would just feel your sheild to see if it is loose in the middle and the back,there common for the welds to let go...

Definitely sounds like heat shield! Like you say mbames,its uncommon for the spot welds to break......but if the previous owner, like me had a decat fitted then put the cat back on for its MOT the cat may have been dropped or banged inbetween fitting / removal.

Just out of interest, is it a huge problem if you remove the heat shield from a cat? I know it's obviously there for a reason, but my de-cat didn't have one and it didn't seem to cause any issues.

Cheers!

Like you say mbames,its uncommon for the spot welds to break......

Nope, I said it was not uncommon for the spot welds to break.

Just had mine welded back on...the mechanic said that he has lost count of the number of Audi's, Seat's, VDubs, and Skoda's he has had to weld the heatshield back on to.

So you did mate, apologies....anyway know how vital it is to keep it then, or can it just be pulled off?

So you did mate, apologies....anyway know how vital it is to keep it then, or can it just be pulled off?

If Skoda saw fit to design/manufacture/fit then it is probably there for a reason. If nothing else it will stop the carpet getting extra warm.....

If Skoda saw fit to design/manufacture/fit then it is probably there for a reason. If nothing else it will stop the carpet getting extra warm.....

The heatshield is between the cat and the road, not the cat and the floor of the car?? Well the one I had welded back on was...

Just out of interest, is it a huge problem if you remove the heat shield from a cat? I know it's obviously there for a reason, but my de-cat didn't have one and it didn't seem to cause any issues.

Cheers!

that's cos a decat won't get as hot as a cat, so no wonder there were no issues!