Fabia III accelerates/maintains speed on its own after releasing the accelerator pedal

[Ootohere]

They never engineered the engine management for driving pleasure or behavior. Just for the WLTP regime and WLTP.   Battery getting some charge slowing down and you have 0w 20 FS oil if you use what they used and recommended.   It could be worse. You could be in a mild hybrid, PHEV or a BEV. 

[Nix2]

I also drive a 2019 Corolla 1.2T every day (similar turbo engine with direct injection, 1.2L/116 HP, but with 4 cylinders).

 

The Corolla does not offer such surprises as the Fabia.

When you let off the gas, it slows down obediently. And the WLTP and WLTP regimes must also meet...

[nta16]

There are far too many competing priorities for the computer programmers programs, then what's going on with the car and how these programs interpret everything and that's not allowing for computer errors and glitches and (not saying this is with your car) components and parts perhaps not fully working or faulty.  The manufacturers are still learning about these things and despite any amount of pre-launch testing often it's the customer's use in the real world over real time that aids development.  British customers used to do most of the testing and product development once they bought the vehicles for some British brands (I know I was one of those customers).  🤣 

[nta16]

11 minutes ago, Nix2 said:

I also drive a 2019 Corolla 1.2T every day (similar turbo engine with direct injection, 1.2L/116 HP, but with 4 cylinders).

 

The Corolla does not offer such surprises as the Fabia.

When you let off the gas, it slows down obediently. And the WLTP and WLTP regimes must also meet...

Well it is a 4-pot

 

but also, you can't really compare a Toyota with a VW, Japanese engineering against German, it's just not fair.  😄

 

[nta16]

Does your 2019 Fabia also act like a very nervous and very interfering with it's hands on yours and on your feet, throwing up amber warning about the road, your driving, a leaf blowing in the wind and the warnings are so brief they catch your eye but not up long enough to see what they were, having distracted your gaze from the road?

[Ootohere]

@Nix2 The Japanese, South Koreans and even the French had the engines and software ready well in advance of the WLTP,s certification.

 

It was the Germans that thought that they would get away with their usual cheating and the use of their test centres.

They were struggling to get the required emission figures, just like now where they get the EU to kick Euro 7 down the road a while longer.

VW buying into Suzuki got them no place and then Suzuki with money lent by Toyota bought the share back on the eve of the defeat device scandal breaking.

 

Vorsprung Durch Tecknik,  or kid people on with what they are going to do, eventually. 

[Nix2]

That's all I think about this topic - I created a separate topic (for the sake of order) regarding strictly "Idle speed of Fabia 1.0 TSI"

[theid]

Just to throw a spanner into the works I found this topic while searching "manual Skoda Fabia+acceleration when brake pedal is pressed in neutral" in duckduckgo.    This has started to happen in the last couple of weeks and I am now going to research the anti-stall system.    I notice that the RPM is always (i.e. default) pretty much on 1000 when I am accustomed to an RPM of 800. I have an extended warranty through the dealer which expires in August 2025 so hopefully can get some answers 

before that.

[Nix2]

As for the revolutions, I started a separate thread - IMO, the revolutions indicated by the counter are not precisely indicated, so it is difficult to say whether it is about 1000 rpm or less.

[nta16]

To eliminate possible error in display you need an appropriate (with program for VW ) scan tool, this of course only eliminates the display and not any error in the car's information or error in the scan tool but you would hopefully get a more accurate figure if there is an error with the display.

 

[Nix2]

Of course, I started a thread about rotational speed along with a photo from VCDS, but no one has responded so far...

 

https://www.briskoda.net/forums/topic/522876-idle-speed-of-fabia-10-tsi95km/?do=findComment&comment=5844781

 

Edited 2 May by Nix2

[nta16]

2 hours ago, Nix2 said:

Of course, I started a thread about rotational speed along with a photo from VCDS, but no one has responded so far...

Sorry, I had forgotten that for yourself, I think much has already been put here already so unless other viewers post to that thread you might have to look at other Skoda or VW models with the same engine and gearbox of the same age and see what they have discovered.  I don't know and I am biased but I think it might be to do with VW programming and might not get sorted by VW as your car is out of warranty, that's if they knew how to sort even if they wanted to but I could well be wrong and this can be sorted and someone has a resolve.

 

A long shot, you could perhaps try posting in the 'General Maintenance' forum or become a Freedom or Freedom Lite supporter and post in the 'Ask a Tech' forum.

 

https://www.briskoda.net/forums/forum/103-general-maintenance/

 

https://www.briskoda.net/forums/forum/51-ask-a-tech/

 

[thamestrader]

On a different car (Mitsubishi) I had exactly the same thing, and its quite alarming when a car speeds up after releasing the throttle. Mine was also a very high mileage vehicle, 160,00 miles or 256,000 kms. owned by me from new and always maintained correctly. The cause was a worn throttle body spindle. The spindle is what the butterfly valve is fitted to that regulates the amount of air going into the engine and thus the RPM. The various sensors on the engine are set to provide the correct amount of fuel and ignition timing for the position of the butterfly valve. With a worn spindle the butterfly valve no longer moves  as expected by the driver and the engine sensors behave according to the actual butterfly valve position and not position intended by the driver. In my car the RPM was unpredictable sometimes it increased other times it didn't - very alarming in slow moving traffic as it could randomly increase by itself without any input from the driver! This might be what is affecting your high mileage FAbia.

[Nix2]

Yes, but my Fabia has only 160,000 km of mileage, the other car - Rapid has 130,000 km of mileage, and the throttle has an "adaptation" option, which means that it adapts (compensates) for wear to a certain extent.

[Nix2]

And besides:

No one, no one has ever written that his Fabia 1.0TSI (or another company car with exactly this engine) does NOT behave like that, so I think (after the behavior of two cars) that this type is simply like that.

 

@thamestrader

•  

And what specific Mitsubishi is it?

Edited Friday at 09:19 by Nix2

[Warrior193]

1 hour ago, Nix2 said:

And besides:

No one, no one has ever written that his Fabia 1.0TSI (or another company car with exactly this engine) does NOT behave like that, so I think (after the behavior of two cars) that this type is simply like that.

 

@thamestrader

•  

And what specific Mitsubishi is it?

I would add that SWMBOs Fabia 1.0TSI 110 only exhibits this assumed anti-stall behaviour on first start from cold - simply controlled by anticipating and using brake pedal. 

[Ootohere]

@Warrior193  Is that a 1.0 TSI from before the have a GPF or after?   (Gasoline Particulate Filter.) 

[nta16]

I am a fan of cleaning throttle bodies so they can work within their full range and have it within any parameters for computer programs but I don't think this would be the resolve here, but it might help otherwise at 100K-miles (160,000km) and do no harm as part of servicing and maintenance at this sort of mileage.

 

Rover V8 stepper-motors used to stick so you could be going along at pace (not necessarily high revs) approaching a bend or give-way/stop, lift off for the engine braking you got with those engines and/or apply the brakes but the engine revs remained pushing you along more than you wanted, not great and intermittent so the fun of not knowing when it would happen next.  You could clean or replace the stepper -motor but it could return regardless.

 

[Warrior193]

50 minutes ago, Ootohere said:

@Warrior193  Is that a 1.0 TSI from before the have a GPF or after?   (Gasoline Particulate Filter.) 

EA211, 1.0TSI 110 CZHC - yes, with GPF - my information is that GPF was fitted from 2017. 

[Nix2]

35 minutes ago, nta16 said:

I am a fan of cleaning throttle bodies...

 

Of course, I am willing to clean the throttle, but I am not sure if it is easy to disassemble it, or if it can be cleaned without unscrewing it, using a preparation injected after removing the air filter?

[Nix2]

1 hour ago, Warrior193 said:

I would add that SWMBOs Fabia 1.0TSI 110 only exhibits this assumed anti-stall behaviour on first start from cold - simply controlled by anticipating and using brake pedal. 

In my case, it is not about the first cold start, this phenomenon always occurs, even after the engine has warmed up as much as possible.

 

 

 

[Ootohere]

@Warrior193 I thought the 1.0 TSI was with a GPF from 2018 not 2017.

They replaced 1.2 TSI,s and had no GPF at first. 

[nta16]

6 hours ago, Nix2 said:

Of course, I am willing to clean the throttle, but I am not sure if it is easy to disassemble it, or if it can be cleaned without unscrewing it, using a preparation injected after removing the air filter?

I thought your car was fully serviced but I might have been mistaken.

 

Not having your engine code I had to guess at DKLD to look the part up, whilst doing so I found a thread on Briskoda about 1.0 TSI in UK being known to have throttle body issues which was dealt with by part replacement but as the part is expensive (in UK at least) and may or may not be an issue I would certainly start with cleaning it properly to see if that gives any improvement.

 

To clean it properly it needs to come out and be properly and thorough cleaned, it looks like after you've removed whatever is necessary to get at it you just need to remove the "retaining bar" by taking its "holding bolt" out,

 

Personally I would always use a good make of specialised throttle body cleaner rather than a more generally cleaner as I always expect the correct chemical(s) product to do all the hard work of cleaning for me without causing any concerns about its use on the item.

 

I believe it is recommended to replace the throttle body seal too and given this whole work isn't a difficult job but is, like many perhaps on a car, just awkward, so a PITA to me, I would replace the seal for the no doubt few pounds (for a bit of rubber) to save me wrestling with the stupidly designed engine air filter box again.  If you have not already done so recently I would also suggest cleaning the inside of the air box and the inside any air feed pipes you can easily get at, and consider replacing the air filter, if required whilst the stupidly designed air box is out of the car.  And if appropriate check or change the spark plugs whilst the stupidly designed PITA air filter box is out of the way too.

 

[Nix2]

I confirm, the engine has the DKLD code, and can you provide a link to the thread about the faulty throttle in the Fabia?

[nta16]

1 hour ago, Nix2 said:

can you provide a link to the thread about the faulty throttle in the Fabia?

Wasn't a Fabia thread, Octavia in UK IIRC.

 

You are in luck I have found it again, I don't always, but also note it seems to relate to 2017 so hopefully they had it sorted by 2019 and that throttle problem presented differently, but as requested here is that thread. - 

 

Edited Saturday at 08:42 by nta16
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