As an aside, I just looked in my shed and found the throttle cleaner I used on a mate's car, I've not used it yet on my wife's Fabia because the mileage isn't that high yet and I loathe doing anything on our cars and that one particularly, as he didn't want to remove the throttle body we used it on the car but it did not do as well as I would usually have it by taking parts off the car.  I normally also use clean old rags (so not the ones I wear) and if appropriate a clean old toothbrush too. 

 

Other brands are available just the one I bought, (keeps it German too 😁)  Liqui Moly Pro-Line Drossen Klappen Reiniger (Clean Throttle Flaps) Throttle Valve Cleaner. -https://www.liqui-moly.com/en/gb/pro-line-throttle-valve-cleaner-p000072.html#5111

 

I have also used a MAF sensor cleaner on a few mates' vehicles to good effect, one in particular a 2005 diesel small car type van, on the test drive after he said it was the first time in a very long time he got up the rev range that high, I only cleaned the sensor nothing more.  It was of no noticeable just, driving effect on my wife's Fabia as it was lower mileage and quite clean anyway (I didn't bother checking with scan tool), I only done the Fabia because it was so easy to access, VW didn't even bother to use the two screw holes available on the sensor just the usual VAG fantastic-plastic clips.

 

Edited 4 May, 20242 yr by nta16
spelling

2 hours ago, nta16 said:

...and that throttle problem presented differently...

I have seen many threads on various forums about a broken return spring in such throttles, but then the engine does not work properly, the lights e.g. EPC come on and an engine error code is generated. You can't drive a car like this normally, so that's a different matter.

1 hour ago, Nix2 said:

I have seen many threads on various forums about a broken return spring in such throttles, but then the engine does not work properly, the lights e.g. EPC come on and an engine error code is generated. You can't drive a car like this normally, so that's a different matter.

I have no idea what the problem was in that thread and realised it might not apply to your case, as I put the presentation was different.  I am not suggesting a broken spring now but you must always consider that an issue may have more than one point of source and that there can be contributing factors which is why you want as much as you can to be working properly as much as possible or reasonable, even if not directly related things can be indirectly related.

 

I don't think cleaning a throttle body or MAF sensor will solve your issue but either or both, if required, might help generally, same idea as having a fully charged battery before spending a long time looking for engine starting or electrical issues, 160,000km is a good point I think to do more servicing and maintenance than a Dealership might to keep the car in good and help resolve issues (that can be resolved).

 

Just out of curiosity does your car have a GPF as I wonder how much computer programming might have been rewritten for it (I have no idea)?

 

4 hours ago, nta16 said:

does your car have a GPF...

I'm not sure, but one of my colleagues wrote here that all Fabia cars from 2018 have GPF... but I don't know how to check it. Can this be checked, for example, using VCDS? Or by decoding the VIN?

Message me the VIN and I'll see what I can find out. 🙂

@Breezy_Pete - Vin sent to PM. Thanks !

Edited 4 May, 20242 yr by Nix2

Unless I have got it wrong, seems to be something like this, an old gas "geezer" type looking thing from the 1950s, very 21st century engineering I'm sure, Jules Verne might recognise it. 🫠

 

ETA This one is listed on eBay UK as a "VOLKSWAGEN GOLF MK8 GTI Catalytic Converter GPF Particulator Filter 5WA131723D".

 

Edited 4 May, 20242 yr by nta16
ETA:

I started cleaning the throttle (without disassembling it, I just took off the air pipe with the latches) - IMO it was very nice, clean and actually did not require cleaning. It also has a functional spring - it returns to the "zero" position correctly.

 

And regarding GPF - do you think these symptoms may be a GPF issue?

A 2019 car with 100,000 miles suggest it might have been used for longer journeys at higher speeds so if services and maintenance were kept up I am not surprised that the throttle is so relatively clean but not knowing the history of the car it could have done the 100,000 miles in say three years then had a year of short journeys on congested town/city streets in debris filled environments without being serviced or any combination or history, you don't know until you check.

 

I have no idea about the GPF, they are not supposed to make any odds to the running but I wonder if the computer programming needed changing to accommodate them which might affect other program settings.  You would have to ask VWSkoda and personally I don't think you would get much joy from doing that but you could try and I might be wrong as I often am.

 

Even though the throttle is clean which is a good sign I would still check the air filter and spark plugs particularly if you have no certain record that they have been changed, neither may have anything to do with your revs issue but you want to prevent any other potential further issues, even live running scan tool results can only tell you so much and programmed parameters for some things can be quite wide.

 

You could try doing and thoroughly looking at various live scan reports concentrating on various components that might cause or contribute this to this issue but it might be a long job, IIRC the numbers my wife's 2015 Fabia had 638(?) data points for the engine(?) and I would imagine a 2019 car would have possibly more, certainly more on the whole car than a 2015 model. 

 

I am not sure you will ever get to the bottom of this but again I might be wrong as I often am, good luck.