EM TuningChris Nott
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  1. #1
    Dubstep's Avatar
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    Failed MOT on emissions, need advice please

    Hi, so my car went for its mot today and failed on its emissions. Ive had the car sorn'd for the past year while ive done some work on it.
    here are my Emission results:

    Fast Idle:
    CO = 1.24 - fail
    HC = 759 - fail
    Lambda = 0.988 -pass

    Second Fast Idle:
    CO = 1.17 -fail
    HC = 296 -fail
    Lambda = 1.146 - fail

    Natural Idle:
    CO = 1.50 - fail


    The car is modded with SS mani, 3" dp, 200 cell cat and jetex exhaust. Ive connected to a VC and no faults are coming up.

    How can i reduce these figures?
    Audi S3 APY.

    Man needs god like a fish needs a bicyle.

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  3. #2
    "Stick a V8 in it!"

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    The figures are higher than you would expect with no cat at all on a healthy engine, so i'd suggest you need to be looking at fuelling/sensors.

    Might be lambda or MAF, or a air leak throwing out adaption?

    Have a look at the fuel trims with VCDS.

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  4. #3
    RIP S3dave

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    ecu can only control its lambda....
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  5. #4
    Dubstep's Avatar
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    Ok, so ive got a brought some things to try and fix my issue:
    Plugs
    Fuel filter
    Wynns Clean burn

    Should i be looking at getting a new lambda sensor (apy so only have 1 sensor)?
    Also ive noticed that it might be running rich as the mpg is bad and there is a faint smell of fuel in the engine bay when engine running, would putting the original airbox back on then restrict the amount of air therefore lowering the ratio?
    Audi S3 APY.

    Man needs god like a fish needs a bicyle.

  6. #5
    RIP S3dave

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    do you have vagcom to check lambda readings
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  7. #6
    Dubstep's Avatar
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    no :-( only a cheap vc to read/wipe codes
    Audi S3 APY.

    Man needs god like a fish needs a bicyle.

  8. #7
    AJC
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    I've had exactly the same problem with the MOT last week. I'm about to connect up VCDS to check for fault codes but think I might need a new lambda sensor. Any way to check Bill if this needs to be replaced?

 

 

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