The following comments relate to when my car is warmed up, stationary, and at idle. I have noticed that sometimes the flow of gas from the exhaust is much stronger than other times. Does anybody know why this happens?:confused: (55 plate fabia vRS).

Like lumpy idling?

No it's stranger than that. If the car has been sitting at idle for a couple of mins the flow of gasses from the exhaust will suddenly increase. There is a faint whistle too - maybe the turbo spooling up:confused: .

Well if it's at idle, that'd be the turbo winding down. If you feel it's a problem then go and get it checked, but from what you've discribed doesn't sound a problem.

Its more like the turbo spooling up than down- hence the increase in gas flow. I don't see it as a problem-just weird. Maybe its the ecu trying to keep the cat clear or something?

Doesn't the Exhaust Gas Recirculation cut in/out after a couple of minutes idling? That's what I assumed it was when mine does it.

I also noticed it but it was like that from new so i dont think thats a problem. It's most noticeable when it was driven hard and then idling.

Doesn't the Exhaust Gas Recirculation cut in/out after a couple of minutes idling? That's what I assumed it was when mine does it.

Apparently, yes. EGR is most evident at idle, but it cuts out after 2 min idling for some reason (to prevent soot build up?). Read this on Fred's TDI Page. TDIClub.com. VW TDI Enthusiast Community, which is a great place for TDi knowledge.