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  1. #1
    Welly's Avatar
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    Bad misfire under boost

    I'm getting a bad misfire under boost in the S3.

    It only started yesterday on the way back from crimbo shopping, went to over take something and she had a bit of a stutter. Put it down to one of those things and carried on home. Worse today, was bad on the way to work, and has now developed into a bad misfire as soon as you get anywhere close to full boost.

    VAG COM has thrown a 16514 DTC, which is Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit - intermittent.

    This code has been there for a little while now, and i thought it strange that it would start causing problems all of a sudden...

    Any ideas good people, before I am forced to burn it?
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  3. #2
    s3gav's Avatar
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    mine did the same awhile back turned out to be coil pack though i never checked for a fault so may be something else on yours

  4. #3
    S3 HODGE's Avatar
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    Most likey a Coilpack as there very well known for failing after having the remap on the S3's.... or ive heard of the MAF giving these problems?

    If it is the coilpacks it maybe a better idea to bite the bullet and get all four or you may find you will be "chasing your tail". Also buy the Genuine Coilpacks there around 30 each from TPS,GSF etc....
    Hope this helps.

    The One And Only Brown Bora

    Current: 2007 S3, Solar Orange - Revo Stage1 + all the toys
    Sold: 2000 S3, Black
    Sold: 2003 BAM Nogaro Blue S3, Revo Stage2, 19" Rial Daytona's, AP Coilovers
    Sold: 2001 A3 1.8T
    Sold: 2002 A3 1.8T, Custurd Code, BBS CH, AP Coilovers
    Sold: 1999 A3 1.6, Jewish Racing Gold, S4 Wheels

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  5. #4
    Dani_B19's Avatar
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    Mate you aint having no luck are you. Hope you get it sorted. Said there wasnt sumet dodgy about it though.

  6. #5
    <tuffty/>'s Avatar
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    Does it happen on part throttle?

    Have you logged for misfires?

    Is the misfire always there during idle, part throttle and under full load?

    If the lambda is playing up then fuelling could be all over the place... could be dumping fuel under boost and giving you the misfire...

    Try logging blocks:
    001 - will tell you how much fueling the ECU is adding/taking away
    031 - will tell you AFR
    115 - requested boost v actual

    and check 032 after a run to see what the adaption values are...

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  7. #6
    Welly's Avatar
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    Quote Originally Posted by Dani_B19 View Post
    Mate you aint having no luck are you. Hope you get it sorted. Said there wasnt sumet dodgy about it though.
    Think it's a coil to be fair, and if it is, it's just one of those things!
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  8. #7
    Welly's Avatar
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    Quote Originally Posted by tufftybloke View Post
    Does it happen on part throttle?

    Have you logged for misfires?

    Is the misfire always there during idle, part throttle and under full load?

    If the lambda is playing up then fuelling could be all over the place... could be dumping fuel under boost and giving you the misfire...

    Try logging blocks:
    001 - will tell you how much fueling the ECU is adding/taking away
    031 - will tell you AFR
    115 - requested boost v actual

    and check 032 after a run to see what the adaption values are...

    <tuffty/>
    No miss under idle, good as gold... I'm going to take it out in a bit and see whats what. Watch this space.

    Also, no misfires logged earlier in the engine fault codes.

    Got a copy of VAG COM 409 handy, are the measuring blocks the same?
    Last edited by Welly; 2nd December 2009 at 21:25.
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    "Marriage is like a coffin and each kid is another nail."
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  9. #8
    Dani_B19's Avatar
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    Well i hope it is mate.

  10. #9
    Sandip's Avatar
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    Sorry to sound a little basic, you might just need a new set of plugs, when mine was missing under boost last year i ended up changing loads and in the end all it wanted was plugs
    3.2 V6 with Custom Code VVT Attack Software


  11. #10
    <tuffty/>'s Avatar
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    Quote Originally Posted by Welly View Post
    No miss under idle, good as gold... I'm going to take it out in a bit and see whats what. Watch this space.

    Also, no misfires logged earlier in the engine fault codes.

    Got a copy of VAG COM 409 handy, are the measuring blocks the same?

    Yeah, should all be the same... coil packs usually misfire or lumpy idle...

    Private road, third gear from 2k rpm to redline... usual story

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  12. #11
    Welly's Avatar
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    All sorted

    Took each pack out in turn and gave it a bit of love. A bit of corrosion on the electrical connector on cyl 3 I believe was the cause (must of been - wet fuel still on the spark plug), still, all good now. WD40 and a bit of 800 grade wet and dry. Did all of them for good measure. Problem gone.

    *Big Sigh*
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    "Marriage is like a coffin and each kid is another nail."
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  13. #12
    S3 HODGE's Avatar
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    Ahh good man. Car must of been sat around for a bit before you bought it?

    The One And Only Brown Bora

    Current: 2007 S3, Solar Orange - Revo Stage1 + all the toys
    Sold: 2000 S3, Black
    Sold: 2003 BAM Nogaro Blue S3, Revo Stage2, 19" Rial Daytona's, AP Coilovers
    Sold: 2001 A3 1.8T
    Sold: 2002 A3 1.8T, Custurd Code, BBS CH, AP Coilovers
    Sold: 1999 A3 1.6, Jewish Racing Gold, S4 Wheels

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  14. #13
    Welly's Avatar
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    Quote Originally Posted by S3 HODGE View Post
    Ahh good man. Car must of been sat around for a bit before you bought it?
    Yes, I believe it has been for a substantial period of time. Poor old girl
    ------------------------------------------------------------------------------------------
    "Marriage is like a coffin and each kid is another nail."
    Homer Simpson





  15. #14
    S3 HODGE's Avatar
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    Just give her a good service and a nice fresh tank of fuel and she will treat you well
    Godd buy tho mate, I heard how much you payed for it!

    The One And Only Brown Bora

    Current: 2007 S3, Solar Orange - Revo Stage1 + all the toys
    Sold: 2000 S3, Black
    Sold: 2003 BAM Nogaro Blue S3, Revo Stage2, 19" Rial Daytona's, AP Coilovers
    Sold: 2001 A3 1.8T
    Sold: 2002 A3 1.8T, Custurd Code, BBS CH, AP Coilovers
    Sold: 1999 A3 1.6, Jewish Racing Gold, S4 Wheels

    Xbox live ID: o_HODGE_o
    PS3 live ID: Hodge_09

  16. #15
    Welly's Avatar
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    Cheers dude, thats exactly what I plan to do. I only run my cars on V Power or Tesco 99 because it makes such a difference I think. Plus much cleaner burn.

    Just ordered all servicing kit for her as well - so that will be a job for just before Xmas!!
    ------------------------------------------------------------------------------------------
    "Marriage is like a coffin and each kid is another nail."
    Homer Simpson





  17. #16
    S3 HODGE's Avatar
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    Good stuff, Yea ive always run mine on V-power! Seems to burn quicker but well worth the few extra pence

    The One And Only Brown Bora

    Current: 2007 S3, Solar Orange - Revo Stage1 + all the toys
    Sold: 2000 S3, Black
    Sold: 2003 BAM Nogaro Blue S3, Revo Stage2, 19" Rial Daytona's, AP Coilovers
    Sold: 2001 A3 1.8T
    Sold: 2002 A3 1.8T, Custurd Code, BBS CH, AP Coilovers
    Sold: 1999 A3 1.6, Jewish Racing Gold, S4 Wheels

    Xbox live ID: o_HODGE_o
    PS3 live ID: Hodge_09

  18. #17
    Welly's Avatar
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    To be fair, when I tickle it around, I get better MPG on V Power. Problem being I never tickle it anywhere
    ------------------------------------------------------------------------------------------
    "Marriage is like a coffin and each kid is another nail."
    Homer Simpson





 

 

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