I have a 1.2 tsi skoda fabia 2011, and i have some serious idling issues! For some reason it’s inconsistent! Which means that sometimes it idles fine and sometimes it idles roughly and one cylinder shuts down then the epc lights up. Usually when this happens, two lights light up, the traction control light and the low tire pressure! They light up and the engine struggles to idle. But when i start moving the two lights go away! This problem only happens at a stop, i have to mention that i took the car to alot of garages and no one seems to solve the issue, i have replace the spark plugs, coilpacks, fuel injectors, fuel filters, spark plug cables, fuse box and basically everything and the car still randomly idles roughly at stops. Anyone can help me diagnose the problem!?

8 hours ago, Adam12 said:

I have a 1.2 tsi skoda fabia 2011, and i have some serious idling issues! For some reason it’s inconsistent! Which means that sometimes it idles fine and sometimes it idles roughly and one cylinder shuts down then the epc lights up. Usually when this happens, two lights light up, the traction control light and the low tire pressure! They light up and the engine struggles to idle. But when i start moving the two lights go away! This problem only happens at a stop, i have to mention that i took the car to alot of garages and no one seems to solve the issue, i have replace the spark plugs, coilpacks, fuel injectors, fuel filters, spark plug cables, fuse box and basically everything and the car still randomly idles roughly at stops. Anyone can help me diagnose the problem!?

Sounds like the alternator/battery combo isn’t generating enough power at idle to me 

3 hours ago, thomasaspin said:

Sounds like the alternator/battery combo isn’t generating enough power at idle to me 

 

This ^^

Are you sure? but why is the esp and low tire pressure light up?

9 minutes ago, Adam12 said:

Are you sure? but why is the esp and low tire pressure light up?

Hi Adam, welcome to the forum. Because the sensors possibly are sending fault messages due to low battery voltage. Check alternator output and battery condition.

Thank you so much!

4 hours ago, Adam12 said:

Are you sure? but why is the esp and low tire pressure light up?

As @Warrior193 said. You might (not will, might) also get your ICE and/or ventilation fan shutting off and/or your headlights dimming at the same time, and for similar reasons. Has a garage ever investigated the fault codes (expect lots) or just used the parts cannon on the car?

I took it to three professional electric garages and no codes show up, also i replaced the throttle body and the tps sensor and i dont think i have a problem with the maf sensor

Did all or any of these three professional electric garages check the battery and charging system?

 

Codes are not the be all, they are useful but you can have problems before they show up and when they do the codes are not always the answer but just a starting point for diagnosis.

 

The heat and especially higher heat effect the battery and charging system more so if you can check your battery and charging system or get it done in none or any of the three professional electric garages did not give you a report that including test results on the battery and charging system.

 

Anyway, to find an electric fault a battery in good state of charge and condition (and all electric wires and connection in good condition) will help with the solution or often can be the solution.

 

Replacing sensors will not help if it is the wiring or connector to the sensor, or computer or its programs, are at fault.  Nor will low quality sensors replacing good quality sensors.

 

When trying to resolve a problem it is best not to assume anything but to test enough to prove.

 

A low battery, or low supply to sensor(s) and/or computer(s) can cause the computers to play up in all sorts of ways and throw up all sorts of unexpected warning and error codes.  Sometimes just clearing the codes can help, if there is a problem and it has not been sorted then obviously the code(s) will return.

 

Put up any reports you got from any of the three professional electric garages and some posters on here may be able to interpret them to help more.

 

52 minutes ago, nta16 said:

Did all or any of these three professional electric garages check the battery and charging system?

Also @Adam12 That's the sort of way I was thinking above; the low alternator output causes a "graceful degradation" of as many car systems as possible before actually stopping the car.

1 hour ago, KenONeill said:

Also @Adam12 That's the sort of way I was thinking above; the low alternator output causes a "graceful degradation" of as many car systems as possible before actually stopping the car.

I agree with Ken , the battery in a nut shell starts the car when running and you turn on more and more ancillaries , I.e lights , ac , the fan , fuel pump , coil packs charging your phone etc this is done via the alternator and if it’s down on power just slightly it will cause these exact issues if you notice when you run all your ancillaries at once it will make the car idle slightly higher as it needs the alternator to spin faster to produce more amperage it will also make the lights dim slightly , what you need to do is run all ancillaries at idle and make sure you are still getting the correct voltage from the alternator you should be getting over 14v if not this would cause havoc at idle as the car is trying to run all its designed to run stuff without the capabilities to run it, also there is a member on here called wino and I’m sure he posted once that there is a vacuum leak on the brake line that can cause a dodgy idle aswell so would be worth dropping him a PM 

1 hour ago, thomasaspin said:

a member on here called wino

Also @Adam12 - He's changed his user tag to @Breezy_Pete . He'll now get a notification of this thread.

Checking the brake servo vacuum hose for splits at the ends of the hard plastic sections is always worth doing on any VW group car, in my experience. 

 

The servo hose is fine i think, my brake servo works fine

3 minutes ago, Adam12 said:

my brake servo works fine

Insufficient evidence. You need to visually inspect, and feel with fingertips any areas that you can't get eyes on.

 

This is an extreme example of what can happen:

 

Edited 28 July, 20223 yr by Breezy_Pete

Mine is not like that mine is good

And if i had an air leak i think the misfiring would be consistent, mine is sometimes rough and sometimes the idling is smooth, and i feel like the engine is loud

What about the oxygen sensor? Is there a chance that i have a faulty one?

39 minutes ago, Adam12 said:

What about the oxygen sensor? Is there a chance that i have a faulty one?

 

This is not a process of negotiation, a faulty lambda probe would not cause the combination of warning lights you have shown us.

1 hour ago, Adam12 said:

and i feel like the engine is loud

Perhaps more information on this or a recording might help but it might also not be relevant but without more information or a recording  it cannot be known.

 

Why not rule out the battery and/or charging system being at fault first as this can be done easily and at potentially no or low cost.

 

Got my car checked at a professional electric mechanic last week and he said that there's no problem with the alternator and the whole electric stuff in the car in general however the car drives fine if i dont drive it for a couple of days, but when i drive it for a while after a couple of starts the idling problem returns and it's intermittent! i also asked him if it could be the brake servo and he said that an air leak wont cause idling issues like the one i have.

im still debugging and looking for the problem i would love to get some help

With an intermittent problem like this the car needs checking whilst it is playing up or the circumstances have to be replicated during diagnosis.  Live data whilst the car is running and playing up would be very useful and possibly point to the area of the cause of the issue.

 

The computers are showing a problem whether they are the cause or something else is.

 

Perhaps a video of when the problem is happening with good sound quality might help to help you further.

 

On 21/08/2022 at 23:20, Adam12 said:

Got my car checked at a professional electric mechanic last week and he said that there's no problem with the alternator and the whole electric stuff in the car in general however the car drives fine if i dont drive it for a couple of days, but when i drive it for a while after a couple of starts the idling problem returns and it's intermittent! i also asked him if it could be the brake servo and he said that an air leak wont cause idling issues like the one i have.

im still debugging and looking for the problem i would love to get some help

Did you get the problem sorted. I’m having same issue?

On 28/07/2022 at 13:01, sepulchrave said:

This is not a process of negotiation

 

Yeah but........................... 😆