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Car failed NCT today due to high idle

  • 27-04-2018 09:55AM
    #1
    Nestoya
    Registered Users, Registered Users 2 Posts: 1 ✭


    Hi Folks,
    Car failed NCT today due to high idle. (It barely failed). CO reading was 1.07% where above 0.20% is a fail. HC was 70ppm where above 200ppm is a fail.
    low idle passed CO reading was 0.15% where above 0.30% is a fail
    lambda reading was 0.97Passed
    engine/oil temperature was 88 degrees . Is there a fuel additive that somebody can recommend to lower emissions how much it cost to be fixed thanks


Comments

  • #2
    biko
    Registered Users, Registered Users 2 Posts: 81,219 ✭✭✭✭biko


    What car and year?
    When was car service last?

    Check and change air filter.
    Clean EGR
    Toss in a whole bottle of Dipetane into tank and drive it hard for a day or two.


  • #3
    case_sensitive
    Registered Users, Registered Users 2 Posts: 853 ✭✭✭case_sensitive


    Nestoya wrote: »
    Hi Folks,
    Car failed NCT today due to high idle. (It barely failed). CO reading was 1.07% where above 0.20% is a fail. HC was 70ppm where above 200ppm is a fail.
    low idle passed CO reading was 0.15% where above 0.30% is a fail
    lambda reading was 0.97Passed
    engine/oil temperature was 88 degrees . Is there a fuel additive that somebody can recommend to lower emissions how much it cost to be fixed thanks

    Fuel additives will help, but if your CO score was 5+ times the allowed value, you'll struggle. I put my old Puma through 3 times with every additive under the sun driven for 80km at 4000rpm, there's only so much that'll help.
    A new catalytic converter sorted it though. Depending on the age and value of the car, you could probably get a few years out of a cheap Ebay special, or if the car owes you 5 figures, spring for a proper off-the-shelf one.
    I went ebay + exhaust-fitter install, less than €200 for the fix AFAIR.


  • #4
    peter barrins
    Closed Accounts Posts: 361 ✭✭peter barrins


    This post has been deleted.


  • #5
    Bmw123d
    Registered Users, Registered Users 2 Posts: 352 ✭✭Bmw123d


    peter barrins wrote: »
    Get the underlying cause fixed.

    Sounds to me like a vacuum leak. Fairly simple to trace and fix


  • #6
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    peter barrins wrote: »
    This post has been deleted.




    +1. Get the car properly diagnosed to see why the lambda value is not 1.00(00000...) which is a sign that it's overfuelling for some reason. The other values will probably fall back to normal when this is done. Don not buy a new cat as it won't fix the main issue.


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