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AUDI A3 140 TDI SERIOUS MISFIRE ! ANY SUGGESTIONS

Discussion in 'A3/S3/Sportback (8P Chassis)' started by hollow, Mar 24, 2010.

  1. hollow
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    hollow Active Member

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    [Mar 24, 2010]
    my car recently developed a fault. it started a few weeks ago the car developed a short but severe misfire , then it went away and drove as normal ,suddenly the misfire returned very violent ,but with the feel that the car was drawing in air as sometimes the car would surge uncontrolably. the misfire then disappeared again.

    i started to check things

    i replaced the fuel pump in the tank , at this time i noticed the diesel was contaminated with oil

    i replaced the fuel filter which seemed to cure the problem ,which i assumed it was because the filter was clogged .

    i also replaced the tandem pump as this is the usual cause of oil in the fuel .

    still the misfire remained

    also replaced all the injector seals today was really hoping to cure the problem , started car fired up with the misfire no change.

    really at a loss here , i dont mind spending money on the car to cure the fault but im getting no where fast and my wallet is getting lighter per day .

    checked all the obvious with vagcom ,no injector faults ,fuel pressure at tandem pump checked .

    swapped injector loom . no difference

    engine jerks violently car ticks over at 1000-1200 rpm car cannot be reved smoothly try holding revs at 2000 rpm and they swing from 2000 to 3000 rpm

    really dont want to take car to audi ,read a few stories of injector swaps ,cams followers etc and a bill of over £2500

    i could buy a set of injectors only to find that its the cam ,whereas i could buy a complete engine for less money than a set of brand new injectors

    to mean thats not pinpointing the fault thats just guessing and been lucky in the process.

    has any one had the same sort of symptoms before and if so was there a definate cure ?
    Last edited: Mar 25, 2010
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  3. hollow
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    hollow Active Member

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  4. hollow
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    hollow Active Member

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    [Mar 25, 2010]
    this is information incase anyone in the future gets the same symptoms , the egr valve was broken , not the elctronic one but the old vacumn one , the end of the egr valve had broken off luckily it had fallen into the intercooler pipe , was diagnosed by blocking off the egr valve with a beer can . check this first ,will save you alot of time and expense , even though the injector seals had perished ,the egr failed at roughly the same time
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  5. Tonyc
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    Tonyc New Member

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    [Mar 26, 2010]
    HI,

    How easy was it to replace the injector seals??

    Might have to do this on mine in the not too distant fuuture.

    A local diesel shop, calims that if the injector seals fail, you will get derv in the sump due to the presure that the fuel system is under.

    Regards
    #4

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