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  1. #1
    Fast,not furious's Avatar
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    MOT Failure - Emissions



    My S3 failed the MOT yesterday on the emissions test at slow and fast idle: the CO (carbon monoxide0) is reading 0.20%

    It's been serviced recently too.

    Audi say they tried everything,but couldn't get the figure down.

    The car's Custom Code mapped,with sport CAT and C.A.I

    Any ideas??
    Last edited by Fast,not furious; 18th January 2011 at 11:59.


    S3 Brilliant Red - 340bhp

    Custom Code Phase 2 + PSS, Autotech pump, Hybrid Forge/ITG Maxogen CAI /Reflactagold, Sprint Booster, Forge Quickshift, Forge DV, Denso Iridium sparks, PCV mod/oil catch can, R8 oil filler cap, Sachs performance clutch,Exhausts UK custom stainless TBE, Braille no-weight battery,PIAA mirror white DRL's,exterior + interior leds, AndyMac's Sub upgrade, H&R springs, VMR VB3 18x8.5 gunmetal alloys wearing BF Goodrich G-force 235/40

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  3. #2
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    If it's passed an MOT before I would probably be looking at the exhaust, either the CAT itself or an exhaust leak post CAT.

  4. #3
    Fast,not furious's Avatar
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    Quote Originally Posted by Cyrix View Post
    If it's passed an MOT before I would probably be looking at the exhaust, either the CAT itself or an exhaust leak post CAT.
    It passed no prob last year,hoping it's not the CAT!


    S3 Brilliant Red - 340bhp

    Custom Code Phase 2 + PSS, Autotech pump, Hybrid Forge/ITG Maxogen CAI /Reflactagold, Sprint Booster, Forge Quickshift, Forge DV, Denso Iridium sparks, PCV mod/oil catch can, R8 oil filler cap, Sachs performance clutch,Exhausts UK custom stainless TBE, Braille no-weight battery,PIAA mirror white DRL's,exterior + interior leds, AndyMac's Sub upgrade, H&R springs, VMR VB3 18x8.5 gunmetal alloys wearing BF Goodrich G-force 235/40

  5. #4
    jungleman's Avatar
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    iffy set of plugs maybe?
    Factory: Phantom Black S3, BOSE, RNS-E, Adaptive Lights, Interior Lights, Auto Lights

    Added: Evolve Stage 2 Map, Evoms CAI, Milltek TBE Non-res With Special Tips Now At 360bhp & 385lb/ft, VWR 4 pots, H&R Springs, H&R Spacers, Sachs Clutch, '09 Rear Clusters, Pressed Metal Plates, TT Air Vents

    To Do list: Now that would be telling




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  6. #5
    Fast,not furious's Avatar
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    Quote Originally Posted by jungleman View Post
    iffy set of plugs maybe?
    Maybe,worth a try!


    S3 Brilliant Red - 340bhp

    Custom Code Phase 2 + PSS, Autotech pump, Hybrid Forge/ITG Maxogen CAI /Reflactagold, Sprint Booster, Forge Quickshift, Forge DV, Denso Iridium sparks, PCV mod/oil catch can, R8 oil filler cap, Sachs performance clutch,Exhausts UK custom stainless TBE, Braille no-weight battery,PIAA mirror white DRL's,exterior + interior leds, AndyMac's Sub upgrade, H&R springs, VMR VB3 18x8.5 gunmetal alloys wearing BF Goodrich G-force 235/40

  7. #6
    jungleman's Avatar
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    be the cheapest thing to try, they been in the car long?
    Factory: Phantom Black S3, BOSE, RNS-E, Adaptive Lights, Interior Lights, Auto Lights

    Added: Evolve Stage 2 Map, Evoms CAI, Milltek TBE Non-res With Special Tips Now At 360bhp & 385lb/ft, VWR 4 pots, H&R Springs, H&R Spacers, Sachs Clutch, '09 Rear Clusters, Pressed Metal Plates, TT Air Vents

    To Do list: Now that would be telling




    PM me for Weitec & KW coilovers

  8. #7
    Fast,not furious's Avatar
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    About 25000 miles i guess?


    S3 Brilliant Red - 340bhp

    Custom Code Phase 2 + PSS, Autotech pump, Hybrid Forge/ITG Maxogen CAI /Reflactagold, Sprint Booster, Forge Quickshift, Forge DV, Denso Iridium sparks, PCV mod/oil catch can, R8 oil filler cap, Sachs performance clutch,Exhausts UK custom stainless TBE, Braille no-weight battery,PIAA mirror white DRL's,exterior + interior leds, AndyMac's Sub upgrade, H&R springs, VMR VB3 18x8.5 gunmetal alloys wearing BF Goodrich G-force 235/40

  9. #8
    jungleman's Avatar
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    thats loads!!!!
    they must be knackered by now!!
    Factory: Phantom Black S3, BOSE, RNS-E, Adaptive Lights, Interior Lights, Auto Lights

    Added: Evolve Stage 2 Map, Evoms CAI, Milltek TBE Non-res With Special Tips Now At 360bhp & 385lb/ft, VWR 4 pots, H&R Springs, H&R Spacers, Sachs Clutch, '09 Rear Clusters, Pressed Metal Plates, TT Air Vents

    To Do list: Now that would be telling




    PM me for Weitec & KW coilovers

  10. #9
    Fast,not furious's Avatar
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    Quote Originally Posted by jungleman View Post
    thats loads!!!!
    they must be knackered by now!!
    Is it? I thought they were good for 40k?...might be worth a shot then?


    S3 Brilliant Red - 340bhp

    Custom Code Phase 2 + PSS, Autotech pump, Hybrid Forge/ITG Maxogen CAI /Reflactagold, Sprint Booster, Forge Quickshift, Forge DV, Denso Iridium sparks, PCV mod/oil catch can, R8 oil filler cap, Sachs performance clutch,Exhausts UK custom stainless TBE, Braille no-weight battery,PIAA mirror white DRL's,exterior + interior leds, AndyMac's Sub upgrade, H&R springs, VMR VB3 18x8.5 gunmetal alloys wearing BF Goodrich G-force 235/40

  11. #10
    jungleman's Avatar
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    maybe on a stock car, but yours is pretty heavily modified!! bet thats where your problem is!
    Factory: Phantom Black S3, BOSE, RNS-E, Adaptive Lights, Interior Lights, Auto Lights

    Added: Evolve Stage 2 Map, Evoms CAI, Milltek TBE Non-res With Special Tips Now At 360bhp & 385lb/ft, VWR 4 pots, H&R Springs, H&R Spacers, Sachs Clutch, '09 Rear Clusters, Pressed Metal Plates, TT Air Vents

    To Do list: Now that would be telling




    PM me for Weitec & KW coilovers

  12. #11
    Fast,not furious's Avatar
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    Just having a look at the readout:

    Fast idle test
    Speed Not checked
    CO 0.51%vol
    HC 146ppm
    Lambda 1.01

    2nd fast idle test
    Speed Not checked
    CO 0.47%vol
    HC 167ppm

    Natural Idle test
    CO 0.39%vol

    Summary results

    Oil temp 60
    Fast idle test Fail
    CO(0.20) fail
    HC (200) pass
    Lamb(0.97 - 1.03) pass

    2nd fast idle test
    CO(0.20) fail
    HC(200) pass
    Lamb(0.97 - 1.03) pass

    Idle speed Fail
    CO (0.30) Fail


    Oil temp looks low to me,surely a better result would be obtained wit a hot engine?
    __________


    S3 Brilliant Red - 340bhp

    Custom Code Phase 2 + PSS, Autotech pump, Hybrid Forge/ITG Maxogen CAI /Reflactagold, Sprint Booster, Forge Quickshift, Forge DV, Denso Iridium sparks, PCV mod/oil catch can, R8 oil filler cap, Sachs performance clutch,Exhausts UK custom stainless TBE, Braille no-weight battery,PIAA mirror white DRL's,exterior + interior leds, AndyMac's Sub upgrade, H&R springs, VMR VB3 18x8.5 gunmetal alloys wearing BF Goodrich G-force 235/40

  13. #12
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    TBH, we find that high lambda reading needs new lambda/oxygen sensor & high CO2 needs cat (or two in your case!!). The issue could then be the sport cat and how the map is written for it :-(

    The oil temp isnt as crucial to that side of the test, more for the hydrocarbons. Its more important that the lambda sensor & cat are warmed up though usually a warm engine will mean a warm lambda & Cat.
    2003-2008 1998 Red A3 8L 1.8 Sport
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  14. #13
    Fast,not furious's Avatar
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    Quote Originally Posted by Khufu View Post
    TBH, we find that high lambda reading needs new lambda/oxygen sensor & high CO2 needs cat (or two in your case!!). The issue could then be the sport cat and how the map is written for it :-(

    The oil temp isnt as crucial to that side of the test, more for the hydrocarbons. Its more important that the lambda sensor & cat are warmed up though usually a warm engine will mean a warm lambda & Cat.
    The exhaust's only about 2 years old :-(


    S3 Brilliant Red - 340bhp

    Custom Code Phase 2 + PSS, Autotech pump, Hybrid Forge/ITG Maxogen CAI /Reflactagold, Sprint Booster, Forge Quickshift, Forge DV, Denso Iridium sparks, PCV mod/oil catch can, R8 oil filler cap, Sachs performance clutch,Exhausts UK custom stainless TBE, Braille no-weight battery,PIAA mirror white DRL's,exterior + interior leds, AndyMac's Sub upgrade, H&R springs, VMR VB3 18x8.5 gunmetal alloys wearing BF Goodrich G-force 235/40

  15. #14
    Fast,not furious's Avatar
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    Sorted!!

    I ran some Wynns Gold fuel cleaner through her,gave it the beans so she was nice and hot and had it MOT'd at my local Citroen dealership,very helpful! One set of new plugs on standby,just in case though.
    Ok,so i couldn't take advantage of the free MOT at audi,but at least it passed!


    S3 Brilliant Red - 340bhp

    Custom Code Phase 2 + PSS, Autotech pump, Hybrid Forge/ITG Maxogen CAI /Reflactagold, Sprint Booster, Forge Quickshift, Forge DV, Denso Iridium sparks, PCV mod/oil catch can, R8 oil filler cap, Sachs performance clutch,Exhausts UK custom stainless TBE, Braille no-weight battery,PIAA mirror white DRL's,exterior + interior leds, AndyMac's Sub upgrade, H&R springs, VMR VB3 18x8.5 gunmetal alloys wearing BF Goodrich G-force 235/40

  16. #15
    paddy's Avatar
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    How much better were the readings ?

    My car failed the MOT 2 years ago at Audi's because of worn disc's....took it somewhere else and its been fine ever since. this year i asked them to check the disc's just in case and they said about 70% worn but fine for another year.
    Ibis white Revo S3 and now matching Vivaro LWB HR 2900 :-)

    Many people are alive because its illegal to shoot them.

  17. #16
    FranA3's Avatar
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    i would be tempted to put a new set of plugs in there anyway as they have done alot of miles and are prob nackered by now
    ​She is back on the road yay!!

 

 

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