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misfire under boost, flashing CEL

Discussion in 'A3/S3 Forum (8L Chassis)' started by JoeeS3, Nov 14, 2013.

  1. JoeeS3
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    JoeeS3 Active Member

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    [Nov 14, 2013]
    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?
    #1
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Nov 14, 2013]
    Any fault codes?

    <tuffty/>
    #2
  4. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Nov 14, 2013]
    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
    #3
  5. JoeeS3
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    JoeeS3 Active Member

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    [Nov 14, 2013]
    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
    #4
  6. panderoo
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    panderoo New Member

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    [Nov 14, 2013]
    I had multiple miss-fires recently under load, replaced all coils and plugs with TFSi ones and it was gone.
    #5
  7. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Nov 14, 2013]
    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/>
    #6
  8. JoeeS3
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    JoeeS3 Active Member

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    [Nov 14, 2013]
    Which lambda sensor would I get then?
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  9. MIGGZ
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    MIGGZ nanananananananan BATMAN

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    [Nov 14, 2013]
    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
    #8
  10. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Nov 14, 2013]
    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/>
    #9
  11. JoeeS3
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    JoeeS3 Active Member

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    [Nov 15, 2013]
    Is there something cheap that i can get myself to read codes?
    #10
  12. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Nov 15, 2013]
    Look in the stickies... there is a link to a thread I wrote detailing this (the 'read first before posting' one)

    <tuffty/>
    #11
  13. JoeeS3
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    JoeeS3 Active Member

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    [Nov 15, 2013]
    Thanks tufty
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  14. JoeeS3
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    JoeeS3 Active Member

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    [Nov 15, 2013]
    i also have a 1.8 se facelift would this have the same pre cat lambda sensor as an s3 bam?
    #13

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