High Idle/ Rough engine

[Harrihealey02]

My 1.0 tsi with GPF idles at around 900rpm once it has fully warmed up. The first start it will idle at 1500rpm then after 20 seconds or more if is cold and will go back down. I’ve had my car for a year and 3 months and it’s never idled that high when it’s been at operating temperature. I would definitely take it to VW and tell them it’s costing you more money in fuel when other cars with the same engine idle at around 900rpm. It could be that a temperature sensor is faulty and your engine is constantly thinking it’s cold so it’s keeping the revs higher to warm it up.

[grazuncle2]

I had a poor experience in the past.. (idling at 1400 regardless of temp and no discernible high fuel consumption or roughness ) Took it in for investigation and was warned if it was not a warranty issue I would be charged £150 per hour. (my OBD Eleven data reported no such high particulates)

They told me it was regen and needed a forced regen... they didn't keep it long enough to do a regen (which is not covered in warranty and never charged me for it - which they would have it if really was.. On handing it back to me they said 'in passing' that they did a software update! They found other 'warranty stuff for me which they missed over the previous two years they had serviced it!

I'm doing exactly the same journeys and short trips and the particulates/soot data hardly ever change . it is the same before their work and still is the same afterwards.

I'd have been happy if they had just been upfront and told me they did something else.. I was just happy to get it back and not revving away.

[ylaw23]

Hi, for my car, it was a forced regen, no warning lights or anything. Dealership was charging a high price for a forced regen. My local garage used a system cleaner which is suitable for both petrol and diesel cars. It's called Kent Fuel Guard 2. Poured 2/3 of the bottle into my fuel tank with about half a tank of petrol I had left. Then took it on a 45 min drive, most of it was motorway- drove it in gear 4 so the revs stayed above 3/4 consistently. After that, my revs were back to usual (1000 rpm). Hope this helps.

To maintain, i use the redex fuel additive and E5 fuel once every few months so hopefully the GPF doesn't get clogged as fast.

Thanks for the info but my car is not a GTI. It's been going on for a month now. The symptoms you listed, I only have the high idling speed and fuel consumption. The stop/start system is still active. I drive short journeys around town, but have driven it on the motorway revving to 3k for about 30mins once. In the handbook where it explains about the particulate filter, during a regen, a yellow lamp indicator does not light up. I have checked my dashboard and do not see the symbol at all. Also, just found out my car is still under warranty.

You’d said in your previous post your car was a 1.0 95ps SE so I was aware it wasn’t a GTI. However, if your car is a 2019 car then it should have a GPF, and based on the information you’d provided (high rpm and poor fuel consumption) it did sound as if a GPF regen could’ve been the reason for the symptoms you described. Based on forum members’ experiences on this and other forums, not all of the possible symptoms I’d listed will necessarily be present when a GPF regen is happening.

Bear in mind it’s not unknown for VW’s literature to contain errors. There was no yellow indicator lamp displayed on my instrument display when the GPF regen was happening in my car - I was aware of it happening because of the existence of most of the symptoms I’ve listed in my previous post; not the existence of an illuminated warning lamp.

Please update this discussion thread for the benefit of other forum members once you’ve had your car checked out by the VW dealer in case anyone else is having - or has in future - the same issue.

Good luck; I hope you get it sorted - and at VW’s expense as your car’s still under warranty .

Hey very late reply to this but I think my car is going through a forced regen at the moment, same as this guy idling at about 1400 and the gear indicator is telling me to downshift when it said it wouldn't usually (e.g. 3>2 at 40km/h). I'm wondering if it is a regen because although it's idling high I'm not getting any warning lights or status messages in the infotainment and the start/stop is still working. Anything else it could be?