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Emissions failed with Catalytic Converter and Dipetane

  • 04-05-2017 8:44am
    #1
    FuzzyFrog
    Registered Users, Registered Users 2 Posts: 90 ✭✭


    Failed NCT emissions a year ago, put a catalytic converter in and it passed.

    Roll on this year's NCT and the car failed. I tried the Dipetane approach and it still failed.

    The car is 12 years old, in good working order except for the emissions. Is this the end of the road for the car as I already have the cat converter in?

    If I had to sell who would buy a car with no NCT? Garages?


Comments

  • #2
    Cee-Jay-Cee
    Registered Users, Registered Users 2 Posts: 12,235 ✭✭✭✭Cee-Jay-Cee


    What car is it? I'm assuming you serviced it with new oil, oil filter, spark plugs and air filter just before the NCT? If so then perhaps a new O2 sensor would cure the problem. How far out were the emission levels? A good hard/high revving drive right before the NCT gets the car good and hot and working to its optimum also.


  • #3
    cruizer101
    Registered Users, Registered Users 2 Posts: 3,205 ✭✭✭cruizer101


    What exactly did you fail on, put up the details, also whats the car.

    There could be something that is causing the cat to go. So with the new one last year it passed but whatever has caused it to go has done it again, another new one might get you through the test, or could pick one up cheap in the scrappy.

    Same happened me on my last car, I regret not just putting the new cat on for the test and sticking old one back on to keep the new one good.


  • #4
    mullingar
    Registered Users, Registered Users 2 Posts: 5,340 ✭✭✭mullingar


    post up the results, all CO & HC levels


  • #5
    FuzzyFrog
    Registered Users, Registered Users 2 Posts: 90 ✭✭FuzzyFrog


    Audi A4

    Engine/Oil Temperature 110C

    Low Idle
    CO 0.30 vol%
    HC 34 ppm

    High Idle
    Lambda 1.00
    CO 0.31 vol%
    HC 47 ppm


  • #6
    Cee-Jay-Cee
    Registered Users, Registered Users 2 Posts: 12,235 ✭✭✭✭Cee-Jay-Cee


    FuzzyFrog wrote: »
    Audi A4

    Engine/Oil Temperature 110C

    Low Idle
    CO 0.30 vol%
    HC 34 ppm

    High Idle
    Lambda 1.00
    CO 0.31 vol%
    HC 47 ppm

    Did you change oil, filter and spark plugs before the NCT? Your just above the level in the high idle by 0.01 so it shouldn't b too hard to get it to drop under 0.30. A roasting before the NCT (drive 5kms in 3rd gear at high revs) should do it.


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  • #7
    mullingar
    Registered Users, Registered Users 2 Posts: 5,340 ✭✭✭mullingar


    Was it a new or second hand cat?

    With CO level marginally high, I'd check for exhaust leaks and make sure you have a fresh air filter in with no leaks on the ducting as it will affect the maf reading


  • #8
    cletus
    Registered Users, Registered Users 2 Posts: 8,186 ✭✭✭cletus


    To go along with the above post, was it a spurious cat? They dont seem to last as long as oem


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