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Thread: Random Stuttering, bucking and stalling when warm - intermittent no codes A3 2.0TDi (CRBC)

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  1. Random Stuttering, bucking and stalling when warm - intermittent no codes A3 2.0TDi (CRBC) 
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    Hi All,



    Hopefully someone may have experienced this as i am banging my head against a brick wall with this!!



    For the past 3 months i have had strange issues with the car randomly bucking or jerking accelerating, it started when pulling out of a junction and the car would loose power and buck and jerk for a couple of minutes and then clear itself and be fine, this was at its worst on sunny hot days, it then manifesting into jerking / stuttering when cruising and on a gentle throttle too.



    I ran a code reader and the only code i had was P21000 throttle actuator sporadic intermittent. I booked this in with an Audi independant and they suspected a wiring problem but didn't have the time to investigate this so advised taking to an audi main dealer. I took it into the main dealer and they advised replacing the throttle body, £550 later this has been done and the error code has gone however the original problem still exists and no further codes are stored.



    I have started to experience some new symptoms and patterns now. When it is cold it seems fine, if i take it for a 10 mile drive and get it warm and then leave it 30 minutes and start the car the idle is very juddery, this is when it will stall when pulling out of a junction! you can feel it as the idle revs seems to low. When it stalls or cuts out when pulling away the green auto stop start icon appears and sometimes it will start itself within a matter of seconds or i will have to turn ignition off and on again. I have turned the stop start off today and it happened again so i am slightly confused why the green icon would briefly appear when it cuts out. When it does cut out it is not a stall as the car doesn't jolt forward it simply stops as it would be stop / start function and every time before the car has been juddering on idle and has been warm.



    I apologise if this isn't much to go on but i am struggling to know where to go next without any codes, it would be great if anyone has experienced these issues?



    Thanks



    Danny
     
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  2. Re: Random Stuttering, bucking and stalling when warm - intermittent no codes A3 2.0TDi (CRBC) 
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    If you are using a generic code reader I would not put any faith in not retrieving any codes, I get this all the time with customers cars and when we use VCDS we get none OBD codes come up.
    A petition has been started to allow the use of synthetic fuels when they become available, this may allow the continued sale of ICE vehicles post 2030 and the use of classic vehicles well into the future… Their use may even be able to rival electric vehicles given the chance. Please sign this petition IF you feel the infernal combustion engine has a future if sustainable fuels are made available


    https://petition.parliament.uk/petitions/588774
     
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  3. Re: Random Stuttering, bucking and stalling when warm - intermittent no codes A3 2.0TDi (CRBC) 
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    Thanks for the reply, sorry should have mentioned this has been scanned on vcds and no live or sporadic codes have shown up.
     
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  4. Re: Random Stuttering, bucking and stalling when warm - intermittent no codes A3 2.0TDi (CRBC) 
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    The first input signal I would check using VCDS in Measuring Blocks is the rpm value and do this in graph mode so short dropouts don’t get missed as they could be in purely digital mode. If this fails to show a problem, the first part I would replace is the ECU relay
    A petition has been started to allow the use of synthetic fuels when they become available, this may allow the continued sale of ICE vehicles post 2030 and the use of classic vehicles well into the future… Their use may even be able to rival electric vehicles given the chance. Please sign this petition IF you feel the infernal combustion engine has a future if sustainable fuels are made available


    https://petition.parliament.uk/petitions/588774
     
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  5. Re: Random Stuttering, bucking and stalling when warm - intermittent no codes A3 2.0TDi (CRBC) 
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    Quote Originally Posted by Crasher View Post
    The first input signal I would check using VCDS in Measuring Blocks is the rpm value and do this in graph mode so short dropouts don’t get missed as they could be in purely digital mode. If this fails to show a problem, the first part I would replace is the ECU relay
    On this model a3 the coolant temp sensor & the air temp sensor & the exhaust gas temp sensor & the fuel temp sensor all share the same 5v feed & the same ground (earths) worth a check out
     
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  6. Re: Random Stuttering, bucking and stalling when warm - intermittent no codes A3 2.0TDi (CRBC) 
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    On the EDC17 I have seen that output fail internally.
    A petition has been started to allow the use of synthetic fuels when they become available, this may allow the continued sale of ICE vehicles post 2030 and the use of classic vehicles well into the future… Their use may even be able to rival electric vehicles given the chance. Please sign this petition IF you feel the infernal combustion engine has a future if sustainable fuels are made available


    https://petition.parliament.uk/petitions/588774
     
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