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A6 Misfiring

enda1 Mar 7, 2006

  1. enda1

    enda1 Member

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    Need some help/advice. My '99 A6 1.8T has developed a misfire and loss of power above 5K revs. The car has 67K on the clock. It's recently been serviced and all Audi parts were used. I don't have access to VAG.COM but I have a OBD11 scan tool and this is showing no faults. Before I bring it to the dealer to get the diagnostics checked is there anything obvious such as
    1) Coil packs do they fail and can I check them with a multimeter
    2) Fuel filter, how often does this need replacing
    3) MAF, I know my brothers passat diesel has problems with these but are the petrol ones more reliable.

    If there is anything I am missing, if so help would be appreciated.
     
  2. S4_dan

    S4_dan Fire up the Quattro! VCDS Map User

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    leads and plugs? My dad had his car serviced with new leads and plugs etc, then driving under load / putting foot down car began to misfire....problem? A spark plug had cracked!

    Simple repair but costly to trace as the garage searched for it. was too cold and wet for my old man to b bothered and have a look himself!
     
  3. enda1

    enda1 Member

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    Thanks for the reply Dan. I changed the plugs but the problem is the same before and after the change
     
  4. dummi

    dummi smoking a6

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    coil packs and maf are quite common problems on petrol engines

    if you need any new VAG parts try www.vagparts.com , cheap than your local stealer
     
  5. HNH5

    HNH5 Member

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    an easy way to see if the MAF has died is to drive the car with the sensor unplugged - if it's the same with the sensor unplugged then you can be almost sure it needs replacing.
     
  6. enda1

    enda1 Member

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    I used a CTools scanner check the engine faults. i got the following code
    "45AA Tank Breathing Valve-N80 Open circuit". Anyone know where this valve is and how easy is ti to access
     

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