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

fix something and runs well for 1 day, thats it

Discussion in 'A3/S3 Forum (8L Chassis)' started by karl210, Sep 27, 2012.

  1. karl210
    Offline

    karl210 Member

    Joined:
    May 15, 2012
    Messages:
    254
    Likes Received:
    3
    [Sep 27, 2012]
    Right im getting a bit peed off now, my car hasnt run well for the 6 months ive had it. Ive posted logs and asked on here and people have said change various things but everytime i change something it runs great and i think ive finally fixed it, but the next day its exactly the same as before! as though the ecu is not liking the full power of the engine. It doesnt rev through the gears, i keep feeling the engine loosing power at certain revs then the ecu gives it back then lets it go again. Here are all the things ive changed that have given me a good result but then back to normal the next day, ive done all these seperately.
    n249 delete
    injector clean
    full pcv delete with catch can
    new cts
    new maf
    fuel filter
    Theres probably more too which i will post when i remember, too early right now..

    I know you probably cant guess what it is but i was just wondering has this happened to anyone else or does anyone know why it might be doing this?
    #1
  2. Ads

    Ads

    [Nov 22, 2014]

  3. firestorm
    Offline

    firestorm Member

    Joined:
    Jun 15, 2004
    Messages:
    344
    Likes Received:
    2
    [Sep 27, 2012]
    any error codes flagged ?
    done a smoke test ?
    fuel pump ? (check flow X litres per minute)
    coil packs (should flag up as misfiring)
    #2
  4. karl210
    Offline

    karl210 Member

    Joined:
    May 15, 2012
    Messages:
    254
    Likes Received:
    3
    [Sep 27, 2012]
    no codes no
    i know i have a small boost leak somewhere but i dont know if this is the problem because it wouldnt seal itself when i replace something on the car and it runs well then the day after it runs rubbish again, it would be a more constant thing.
    how would i check the fuel pump?
    there are 0 missfires according to vag com and i certantly cant feel any, its as though the ecu is protecting it, i might wind the actuator right down and tighten it up bit by bit and see how that goes
    #3
  5. firestorm
    Offline

    firestorm Member

    Joined:
    Jun 15, 2004
    Messages:
    344
    Likes Received:
    2
    [Sep 27, 2012]
    Fuel pump check - I've only done it with carb equipped cars, I disconnected the primary power feed off the coil, take the fuel pipe off the carb and direct the fuel pipe into a measuring jug, turn the engine over for 15 seconds and extrapolate the litres per minute from how much fuel is pumped. It's not the safest of things to do and may not be applicable to our cars. Hopefully Tufty or one of the other guys will chip in.

    So it runs like **** when cold, but ok when warm ? You've already changed the coolant sensor I see. Did you buy it from VAG garage ? Not an ebay special ??
    #4
  6. hades-
    Offline

    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

    Joined:
    Jul 8, 2008
    Messages:
    8,995
    Likes Received:
    540
    [Sep 27, 2012]
    what car is it
    is it remapped ?
    #5
  7. karl210
    Offline

    karl210 Member

    Joined:
    May 15, 2012
    Messages:
    254
    Likes Received:
    3
    [Sep 27, 2012]
    doesnt matter if its warm or cold the engine feels flat and is holding back so much potential i know it has.
    No its a genuine item, even changing that restored power but only for a day i really dont get it.
    its a 2002 s3 amk engine with stage 1 oettinger remap, n249 delete, pcv delete, b5 tip, cone filter
    the vwvortex boys are suggesting putting a 4bar fpr in, ive not seen much nice things about them on here though
    #6
  8. jezzy
    Offline

    jezzy Member

    Joined:
    Oct 3, 2011
    Messages:
    762
    Likes Received:
    15
    [Sep 27, 2012]
    Try stripping your coil pack harness back and check your wires.
    my car did what your saying and it turned out the wiring had about 10 holes in it.
    And the good thing its FREE.
    well 2 quid for insulating tape.
    #7
  9. karl210
    Offline

    karl210 Member

    Joined:
    May 15, 2012
    Messages:
    254
    Likes Received:
    3
    [Sep 27, 2012]
    ive looked at the harness and yeah there are some wires showing, would this actually give these symptoms though because there are 0 missfires and it doesnt feel as thought its missfiring atall
    #8
  10. jezzy
    Offline

    jezzy Member

    Joined:
    Oct 3, 2011
    Messages:
    762
    Likes Received:
    15
    [Sep 27, 2012]
    only one way to find out.
    have you stripped them right back to were they all join together?( most of my holes were out of sight)
    and they cured my issues
    lets face if the wires are showing they need doing to stop future problems.
    #9
  11. karl210
    Offline

    karl210 Member

    Joined:
    May 15, 2012
    Messages:
    254
    Likes Received:
    3
    [Sep 27, 2012]
    yeah cheers i will do it anyway so its done
    #10
  12. jezzy
    Offline

    jezzy Member

    Joined:
    Oct 3, 2011
    Messages:
    762
    Likes Received:
    15
    [Sep 27, 2012]
    please update the thread so future users can resolve or rule out similar issues.
    Nothing worse than seeing no end and wondering how the op resolved the issue.
    #11
  13. karl210
    Offline

    karl210 Member

    Joined:
    May 15, 2012
    Messages:
    254
    Likes Received:
    3
    [Sep 28, 2012]
    yeah dont worry i do that anyway, really annoys me when people dont because you do a search, read through a full thread then they dont post back with results
    #12

Share This Page