JMB RetrofitsChris Nott
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  1. #1
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    A4 1.9 tdi ESP light and misfire

    Hi

    I have an 03 a4 1.9 tdi with 155k miles. It has always been a great runner but recently has given a few problems until yesterday when I had to be towed home. The AA didn't know what the problem was so I thought I would ask here.

    The last few months it would very occasionally judder for a couple of seconds and then be fine. I had it serviced, had all the filters replaced and they ran an engine cleaner though (although I only had a quarter of a tank of diesel and I think you are supposed to run it through for longer than that?). The problem carried on for a few seconds every few days but then yesterday got much worse. The whole car now judders heavily under idle and does not like accelerating. A few seconds after it started juddering the ESP light came on and is continuous. The engine management light has not come on at all. If I turn the engine off for a few minutes and start it again it runs fine for a few seconds then starts to judder and the ESP light comes on.

    Any ideas? The AA suggested injectors or the EGR valve. I wonder if a fault in the ESP is cutting power to some cyclinders? I am going to take it to a garage but want an idea of what it could be before they suggest replacing the injectors!

    Thanks for any help you can give.
    John

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  3. #2
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    No one near by who could VAG com scan it for you?

    Maybe a MAF ?
    Audi Avant A4 54 1.9Tdi Quattro & Leon Cupra R 2005 1.8T remapped to 275bhp

  4. #3
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    The AA checked and said there were no fault codes reported. Not sure if they can check to the same level as VAG com?

    I'm planning to take it to a VAG specialist fairly close to me so I guess they will do a full scan. I have never used this garage before so wanted to get an idea of anything it could be before they starting suggesting things.

  5. #4
    paul20v's Avatar
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    Maf wont cause a missfire
    at that mileage i would be replacing the injector loom in the head
    there around 35 and are prone for a bad connection on no1 injector due to it being the unsupported side of the loom .
    and also ive seen the esp light come on with a loom fault
    strange but true .

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    The ESP light comes on with most random faults on Audi's!
    Ingolstance Read about my A6 HERE.

  7. #6
    paul20v's Avatar
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    Quote Originally Posted by quattrojames View Post
    The ESP light comes on with most random faults on Audi's!
    The last one that i done was on an octavia but same lump and the esp light came on .

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    OK. So I have the car at the garage now and they have just phone to say that VAGcom is reporting a misfire on cyclinder 1 and also a temperature sensor fault (although he doesn't think that is related/causing the misfire). They are going to try changing the injector wiring loom which I agreed to. The only thought I had is that is runs without a misfire for the first 20 seconds or so. If it was the wiring loom wouldn't it misfire straight away?

    I'm not sure how the engine management works but I wondered if perhaps it may run on a default setting until it gets data from the sensors. A faulty sensor could then mean that the ECU us doing something strange after a few seconds of running.

    Any thoughts?

  9. #8
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    Quote Originally Posted by paul20v View Post
    Maf wont cause a missfire
    at that mileage i would be replacing the injector loom in the head
    there around 35 and are prone for a bad connection on no1 injector due to it being the unsupported side of the loom .
    and also ive seen the esp light come on with a loom fault
    strange but true .
    Sounds like you might have been spot on! who needs a vagcom.. lol
    Audi A4 TDi 130 Sport

  10. #9
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    I got my car back from the garage a few days ago and it seems to be running fine now. It was the wiring loom after all. I still don't understand why as it ran fine for the first few seconds after starting but hey.....it's fixed so I don't really care!

    If anyone is interested I had the work done at GMS Kent in Maidstone. They are only a small outfit but are a VAG specialist and seemed to know what they were talking about.

 

 

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