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

misfire under boost, flashing CEL

JoeeS3 Nov 14, 2013

  1. JoeeS3

    JoeeS3 Active Member

    464
    105
    43
    I changed the spark plugs the other day to see if any thing changed but i had this happen again last night :( could it just be a bad coilpack, they were recently just changed by audi though?
     
  2. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    20,873
    3,698
    113
    Any fault codes?

    <tuffty/>
     
  3. badger5

    badger5 www.badger5.co.uk Site Sponsor

    9,398
    1,942
    113
    correct plugs?
    disturbed the wiring?
    damaged the coils on removal?

    as suggested anything helpfully logged on faultcodes?
    other misfires can be injectors/wiring harness if disturbed

    vcds or faultcode reader will help you investigate it
     
  4. JoeeS3

    JoeeS3 Active Member

    464
    105
    43
    when i checked the other day i had two codes i cant remember the exact codes but it was

    multiple cylinder misfire

    lamda sensor 1 temp sensor high (which i assume is the pre-cat lambda sensor)

    sorry that is not much info but i will try and get it scanned again tomorrow
     
  5. panderoo

    panderoo New Member

    19
    1
    3
    I had multiple miss-fires recently under load, replaced all coils and plugs with TFSi ones and it was gone.
     
  6. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    20,873
    3,698
    113
    Lambda fault could be potentially the reason... faulty lambda leads to incorrect fuelling... misfires on an otherwise solid ignition system points too a rich mixture and this would also cause misfires...

    <tuffty/>
     
  7. JoeeS3

    JoeeS3 Active Member

    464
    105
    43
    Which lambda sensor would I get then?
     
  8. MIGGZ

    MIGGZ nanananananananan BATMAN

    1,461
    304
    83
    i think if it sensor 1 bank 1 that would be the wideband lambda bud. having very similar issues but iv narrowed it down to coil pack loom
     
  9. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    20,873
    3,698
    113
    Would prefer to verify this is the issue tbh... logging as Bill has mentioned would be a good idea or get yourself to a dyno for fault finding etc...

    If you say sensor one and assuming yours is a facelift S3 based on having the coils changed and your username (model, year, engine code always a good thing to include when asking for help in diagnostics) and assuming 'sensor 1' then its the wideband sensor at the top of the downpipe

    Logging AFR on a dyno using a separate lambda (normally inserted into the exhaust) and logging via VCDS would confirm if the ECU is seeing a different AFR to what it actually is...

    <tuffty/>
     
  10. JoeeS3

    JoeeS3 Active Member

    464
    105
    43
    Is there something cheap that i can get myself to read codes?
     
  11. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    20,873
    3,698
    113
    Look in the stickies... there is a link to a thread I wrote detailing this (the 'read first before posting' one)

    <tuffty/>
     
  12. JoeeS3

    JoeeS3 Active Member

    464
    105
    43
    Thanks tufty
     
  13. JoeeS3

    JoeeS3 Active Member

    464
    105
    43
    i also have a 1.8 se facelift would this have the same pre cat lambda sensor as an s3 bam?
     

Share This Page