1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

2.0 TFSI Misfire/slight hesitation advice needed

Discussion in 'A3/S3/Sportback (8P Chassis)' started by B-J-P, May 31, 2011.

  1. B-J-P

    B-J-P Member

    Joined:
    Oct 23, 2010
    Messages:
    58
    Likes Received:
    2
    Hi,

    Wondered if anyone could help. I seem to be getting a misfire and slight hesitation when I accelerate, more noticeable at high speeds and particularly when overtaking.

    I have had a coil pack replaced a few weeks ago after which it was running fine.

    Just been into my local garage and he plugged it in and took it for a spin and couldnt find any problems.

    Anyone here had any experiences of this, I have a Bluefin stage 1 installed so may have to go back to superchips to investigate.

    Thanks
     
  2. Google AdSense Guest Advertisement



    to hide this advert.
  3. antmax7

    antmax7 Member

    Joined:
    Nov 10, 2009
    Messages:
    306
    Likes Received:
    2
    is your car a s3 or standard 2.0T????
    as i know s3's seem to have a well documented problem with missing!
     
  4. jungleman

    jungleman Well-Known Member

    Joined:
    Mar 24, 2010
    Messages:
    2,051
    Likes Received:
    42
    could be 1 of 3 things, coilpacks, plugs or maff... chances are that once one coilpack goes it strains the others so the others could follow soon after, so its always worth buying them in complete sets, also how old are your plugs? and another good test is to whip the plug that connects the maf out as sometimes they can be on there last legs and pack up causing problems
    also as already asked, what car is it and has t been mapped?
     
  5. Boydie

    Boydie Boycie
    VCDS Map User

    Joined:
    Dec 24, 2006
    Messages:
    3,004
    Likes Received:
    245
    Did you only change one coil pack??

    If so, change the rest if one goes then there is extra stress on the others.

    Also check your spark plugs, when were they last changed?

    Have you vagcom? Any faults? I had a flapper failure and had to change the motor :(
     
  6. akash_sky1

    akash_sky1 Active Member

    Joined:
    Nov 14, 2009
    Messages:
    1,191
    Likes Received:
    5
    Check the DV as well, sometimes they can let go gradually and the let boost waver, causing hesitation, although not a misfire.
     
  7. B-J-P

    B-J-P Member

    Joined:
    Oct 23, 2010
    Messages:
    58
    Likes Received:
    2
    Thanks all for the advice, it is an A3 2.0T.

    I've only had the car a couple of months so not sure about the age of the plugs. Although it didnt come with all of the service receipts it is fully stamped within the service history booklet so has therefore undergone whatever was needed at each service stage by Audi.

    It has been remapped using a Bluefin, therefore I may try putting it back to standard and see if that makes any difference.

    Unfortunately dont have VAGCOM and I was under the impression that if you run the car without the MAF sensor connected then it throws up a fault that would need to be cleared?

    The problem is I dont want to start throwing money at parts which dont need replacing.

    Cheers
     
  8. dc240969

    dc240969 Member

    Joined:
    Oct 12, 2008
    Messages:
    892
    Likes Received:
    1
    as was mentioned it could be coils, £35, plugs, cheap enough or it could be you down pipe. MAF, lm not sure on price. Hopefully its not your map.
     
  9. jungleman

    jungleman Well-Known Member

    Joined:
    Mar 24, 2010
    Messages:
    2,051
    Likes Received:
    42
    Well a rough break down of prices, coils £35 each, plugs £14 each and the big one, MAF £130ish so it's a bit of a drag but if you've have a misfire then for precautions I would change out all coils and plugs, also with a mapped car you ahould change your plugs much more frequently, I change mine every year as the extra fuelling will cause additional build up on them.
     
  10. Lewis583

    Lewis583 Active Member
    VCDS Map User

    Joined:
    Mar 15, 2010
    Messages:
    950
    Likes Received:
    89
    Audi are doing a recall currently on all petrol engines 1998 onwards for coil pack replacement, get it booked in with them to change the coil packs first. They may only change 3 because you already fitted a new/non genuine one.
     
  11. B-J-P

    B-J-P Member

    Joined:
    Oct 23, 2010
    Messages:
    58
    Likes Received:
    2
    Cheers, booked into Audi on Saturday as they will be changing coil packs under warranty ! They also confirmed they will be washing and hoovering the car whilst I wait so saves me a job.

    Apparently they will also do a visual healthcheck which I can watch via video link !
     
  12. S3RYE

    S3RYE Interior Next!!

    Joined:
    Apr 20, 2009
    Messages:
    3,460
    Likes Received:
    68
    sounds alright!! good luck mate... Misfires are hell! :3sadwalk:
     
  13. dc240969

    dc240969 Member

    Joined:
    Oct 12, 2008
    Messages:
    892
    Likes Received:
    1
    £35 for a set of coils l paid. £50 for a set of IK24 denso iridiums.
     
  14. jungleman

    jungleman Well-Known Member

    Joined:
    Mar 24, 2010
    Messages:
    2,051
    Likes Received:
    42
    you paid 35 for 4 coilpacks... they must have fallen off the back of a truck as no way will you get them anywhere for that price!
    the oem sparks im sure you can get cheaper then audi, 40 for a set of bosh plugs would be reasonable
     
  15. a8 tech back

    a8 tech back Member

    Joined:
    Apr 2, 2011
    Messages:
    197
    Likes Received:
    4
    Why do all think the mafs are faulty, they never are

    check fuel pressure and check misfire recognition, if its counting up on only one cylinder then its either

    compression, coil pack, plug partial blocked injector from carbon build up (if you scope the injector you will see the pattern alter showing partial spray)

    the crank sender devines the misfire as the rpm will alter thus the pre mapped crank revolution will ping the mil and hopefully pin point which cylinder

    just my findings and i work on these every day and have NEVER REPLACED A MAF ON A TFSI YET

    its normally poor remaps, vacuum leaks, plugs and injectors and in some cases camshaft and valve's sticking

    take your pick but check mvb's for misfire recognition before you do any thing

    note when a cylinder misfire is detected the ecu shuts the injector down and then re balances the fuel to smooth over the imbalance, this can catch you out

    if you have a vacuum leak then the lambda will pick this up so you can simply spray a solvent based aerosol like carb cleaner around the area and monitor the lambda values to determine if you have a leak

    misfire, use cylinder recognition measured values

    boost look at pressure for air and fuel and also valve timing
     
    #14 a8 tech back, Jun 1, 2011
    Last edited: Jun 1, 2011

Share This Page