Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Please note that it is not permitted to have referral links posted in your signature. Keep these links contained in the appropriate forum. Thank you.

https://www.boards.ie/discussion/2055940817/signature-rules
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

NCT Emission Fail! Need urgent attention please

  • 29-09-2017 8:04am
    #1
    nakuloven
    Registered Users, Registered Users 2 Posts: 4 ✭


    Hi All,

    After rebuilding/changing engine and replacing parts and spending a fortune on fixing my Audi A4 1.6L Petrol, the car failed the emission again.
    following were the readings at NCT test:

    Low Idle
    CO 1.82%
    HC 83ppm


    High Idle
    lamdba 0.90
    CO 3.82vol%
    HC 132ppm


    Please suggest! This reading was way better then last time but still need more fix i imagine. Any suggestions or feedbacks?

    Thanks.


Comments

  • #2
    rex-x
    Registered Users, Registered Users 2 Posts: 1,893 ✭✭✭rex-x


    Your car is running far far too rich


  • #3
    grogi
    Registered Users, Registered Users 2 Posts: 8,616 ✭✭✭grogi


    rex-x wrote: »
    Your car is running far far too rich

    Air filter? MAP sensor?


  • #4
    boardsuser1
    Closed Accounts Posts: 6,196 ✭✭✭boardsuser1


    The 1.6 VAG petrol engines were fairly good i thought?

    Would a full service,dipetane and an italian tune up sort it?


  • #5
    rex-x
    Registered Users, Registered Users 2 Posts: 1,893 ✭✭✭rex-x


    Cork Truck Driver wrote: »
    The 1.6 VAG petrol engines were fairly good i thought?

    Would a full service,dipetane and an italian tune up sort it?

    Dipetane and an Italian tune-up can only help when the Co or Hc readings are marginal and lambda is correct. In this case the car is massively overfuelling due to one or more faulty components, injector, lambda sensor, map etc it needs proper diagnosis


  • #6
    boardsuser1
    Closed Accounts Posts: 6,196 ✭✭✭boardsuser1


    rex-x wrote: »
    Dipetane and an Italian tune-up can only help when the Co or Hc readings are marginal and lambda is correct. In this case the car is massively overfuelling due to one or more faulty components, injector, lambda sensor, map etc it needs proper diagnosis

    I had this issue on a 1.4 VW engine previously, you might well be right.


  • Advertisement
  • #7
    rex-x
    Registered Users, Registered Users 2 Posts: 1,893 ✭✭✭rex-x


    Cork Truck Driver wrote: »
    I had this issue on a 1.4 VW engine previously, you might well be right.

    Many things can cause the issue, it's impossible to say without seeing the car and some live data :)


  • #8
    grogi
    Registered Users, Registered Users 2 Posts: 8,616 ✭✭✭grogi


    Is the Lambda value shown by NCT coming from OBD diagnostics or directly from the exhaust analysis?


  • #9
    rex-x
    Registered Users, Registered Users 2 Posts: 1,893 ✭✭✭rex-x


    grogi wrote: »
    Is the Lambda value shown by NCT coming from OBD diagnostics or directly from the exhaust analysis?

    Coming out of the exhaust, only cars with a wideband lambda could show it through obd port and there aren't that many of them :)


  • #10
    barneygumble99
    Registered Users, Registered Users 2 Posts: 4,326 ✭✭✭barneygumble99


    Cork Truck Driver wrote: »
    The 1.6 VAG petrol engines were fairly good i thought?

    Would a full service,dipetane and an italian tune up sort it?

    1.6 vag engine is up there with the 3 cylinder 1.2 engine as one of the worst engines for failing emissions.


  • #11
    boardsuser1
    Closed Accounts Posts: 6,196 ✭✭✭boardsuser1


    barneygumble99 wrote: »
    1.6 vag engine is up there with the 3 cylinder 1.2 engine as one of the worst engines for failing emissions.

    I had 2 of them, a 00 Golf and a 06 Leon, both flew through the NCT without any engine related issues.

    I know the 1.4 is a notorious engine.


  • Advertisement
  • #12
    nakuloven
    Registered Users, Registered Users 2 Posts: 4 ✭nakuloven


    Hi Guys! so got he NCT today .. i went to a garage today in afternoon.. he fixed the emission!
    to wht he told me was that there was wiring issue and the fuse was not plugged in correctly; the engine managemnt light went off and said emission passed!
    just before NCT took the car for a drive n popped in a petrol injector ... and hurrayyyyy!!! it fckn passsed!!
    so happy! ... at the end i'de say its hard to find good mechanic but when u do , things get pretty easy!!

    Thanks for all the suggestions guys!


Advertisement