Hi,

 

OK, basics first.... car is Superb 2013 2.0 TDi 170 Manual 4x4 Estate. 60k miles and out of warranty. Also worth mentioning that the local Skoda dealer is the unpleasant unhelpful sort.

 

Story:

 

Car is fine on a long journey until I fill up at a motorway service station. On coming out of garage I notice a slight (hearable and feeling though seat but not though steering wheel) vibration around 2000-2500 RPM. Hmmn, thinks I. Bad petrol, or something fallen off?

 

Refill tank ASAP with ultimate diesel. Problem does not go away. After a couple of thousand miles has now settled down to vibration/noise at 2010-2150 rpm, all fine between 2150-2250rpm, noise/vibration between 2250-2400rpm, and fine above this.

 

It's bl**dy annoying as it's just at motorway cruising speed, so you are forever moving into and out of vibration zones.

 

This only occurs when the engine is under load when car is moving, and occurs in any gear. Much more obvious when accelerating and in higher gears, but does also occur at steady speed. It does not occur when the clutch is down or out of gear, or slowing down.

 

Wierdly, the noise/vibration sometimes vanishes entirely and the car drives for a shortish period (say one long mororway journey in 20) with no vibration at all - though the "no vibration" journeys are getting less and less frequent.

 

Any ideas people?

 

Strong temptation is wait until whatever is failing actually fails, but the noise/vibration is driving me nuts.

 

Any help appreciated.

 

John

 

 

 

Edited 9 June, 20178 yr by johnhat

Is the no noise drive on the same motorway as the noise drive (different surfaces?). First thought, weights on wheels and then different surfaces combination. 

Danny,

 

Nice idea but sadly not. It's definitely independent of surface and specific to RPM.

If only under the load - then maybe something is wrong with gearbox - maybe DMF ??

Edited 10 June, 20178 yr by jafo

That's I'll admit my thought as a worse case.  Less worse cases were something in relaiton to misfiring/fuel (It did happen when I filled up with fuel, and whilst I'm several tanks down the road, is, say, the fuel filter clogged up with rubbish), or potentially something fallen off/sheared that is vibrating.

When you filed up with fuel did you also put air in the tyres?

To the OP - did you resolve your issue?