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

Diesel emissions NCT

  • 18-01-2016 9:46am
    #1
    _Brian
    Registered Users, Registered Users 2 Posts: 18,721 ✭✭✭✭


    This has been discussed a fair bit on and off.

    My jeep failed the smoke test on the NCT, 5.9 limit is 2.5. Everything else was good.
    XTrail 2.2DCi with 210k km's

    It was close to a service so I popped into the garage to get it sorted. Mechanic said pulling in service in early would have little effect as it's regularly serviced anyway and he was confident everything was within normal.

    He recommended dipathe , book the retest. Use the dipathe until the test. Then for the test , half tank of diesel, add the dipathe , and add 5 litres of petrol. That's 5 litres of petrol to ~ 25 litres of diesel.

    Redid the test and smoke was 0.9

    Immediately filled out the tank with diesel as was a bit nervous with so much petrol in diesel.

    Seems the smoke test is a bit fickle. I know it was said on a thread by an NCT tester that this type of additive and petrol doesn't work, well it worked for me.

    I think for anyone who has a smoke fail on the NCT it's worth a try if everything else is good.


Comments

  • #2
    biko
    Registered Users, Registered Users 2 Posts: 81,220 ✭✭✭✭biko


    Yes, it's not unknown to add petrol to get more burn.
    However, when you're adding petrol you're not fixing what's wrong with the engine, you're merely masking it for the tester.


  • #3
    Atlantic Dawn
    Registered Users, Registered Users 2 Posts: 84,761 ✭✭✭✭Atlantic Dawn
    M


    It's insane that such a lax diesel NCT test exists with no measurement of what is actually emitted.


  • #4
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,195 ✭✭✭✭jimgoose


    Atlantic Dawn wrote: »
    It's insane that such a lax diesel NCT test exists with no measurement of what is actually emitted.

    Isn't it amazing, though?? :pac:


  • #5
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,195 ✭✭✭✭jimgoose


    jimgoose wrote: »
    Isn't it amazing, though?? :pac:

    <rummage> Ah yes, the Vehicle Standards Department at the RSA told me this last October:

    "The procedures outlined in the NCT manual for the emissions test as carried out by National Car Testing Service (NCTS) are derived from and compliant with Directive 2009/40/EC of the European Parliament and of the Council of 6 May 2009 (as amended by Commission Directive 2010/48/EU). The directive explicitly includes instructions as to how the emissions test is to be carried out. You are correct in that Hydrocarbons and Carbon Monoxides (as well as Lamda) are measured from Positive Ignition engine vehicles (petrol) and that Opacity is measured from Compression Ignition (diesel) vehicles. However, the rules and limits regarding emissions testing at periodic inspection are governed by the aforementioned EU legislation."

    TL;DR: 'S the fungin' EU, innit?!? :pac:


Advertisement