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

2001 Mazda MX5 - failed NCT emissions

  • 02-07-2020 1:16pm
    #1
    Wilde_37
    Registered Users, Registered Users 2 Posts: 102 ✭✭


    Hi. My Mazda MX5 - mk 2.5 failed the NCT a while back and I am trying to get it sorted. I had a new aftersale catalytic converter installed recently but the guy who installed it said it still will not pass the test.

    Here are the results of the last test:

    Low Idle (860rpm)
    CO 0.21 vol% - PASS
    HC 448 ppm - N/A

    High Idle (2650 rpm)
    Lambda 0.99 - PASS
    CO 0.52 vol% - MAJOR (must be below 0.30%)
    HC 41 ppm - PASS

    I've tried all the usual stuff like an additive and a long hard drive in 3rd gear before the test, but no joy. Any suggestions.


Comments

  • #2
    Tr_18
    Registered Users, Registered Users 2 Posts: 51 ✭✭Tr_18


    Check that you don't have any exhaust leaks, they can cause a spike in emissions.
    What additives did you use? Diptane is highly regarded


  • #3
    Wilde_37
    Registered Users, Registered Users 2 Posts: 102 ✭✭Wilde_37


    Yes, used Diptane.

    There are no obvious leaks in the exhaust. If I knew it was that, then I could at least have a whole new exhaust fitted.


  • #4
    bop1977
    Registered Users, Registered Users 2 Posts: 1,066 ✭✭✭bop1977


    Try changing the engine oil and filters.


  • #5
    mk7r
    Registered Users, Registered Users 2 Posts: 839 ✭✭✭mk7r


    The cat you put in is no good


  • #6
    mgbgt1978
    Registered Users, Registered Users 2 Posts: 4,261 ✭✭✭mgbgt1978


    Wilde_37 wrote: »
    Hi. My Mazda MX5 - mk 2.5 failed the NCT a while back and I am trying to get it sorted. I had a new aftersale catalytic converter installed recently but the guy who installed it said it still will not pass the test.

    Here are the results of the last test:

    Low Idle (860rpm)
    CO 0.21 vol% - PASS
    HC 448 ppm - N/A

    High Idle (2650 rpm)
    Lambda 0.99 - PASS
    CO 0.52 vol% - MAJOR (must be below 0.30%)
    HC 41 ppm - PASS

    I've tried all the usual stuff like an additive and a long hard drive in 3rd gear before the test, but no joy. Any suggestions.


    He was correct, apparently.;)


  • Advertisement
Advertisement