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Toyota Corolla emissions fail

  • 10-11-2015 10:21PM
    #1
    Chirps92
    Registered Users, Registered Users 2 Posts: 4 ✭


    I have a 98 Toyota Corolla. It's a 1.3 vvti with just over 120,000 miles. It failed the nct on emissions (by .2) which is nothing. The guy on the nct suggested a new standard exhaust (I had a jap style one on) and a new cat converter. I had a new standard exhaust box and cat converter fitted and it still failed the nct again (worse this time). I then had a new lamda fitted and I also used dipetane a week before another nct and drive the hell out of it but it still failed again. The latest readings seem worse than the initial fail and they suggest the cat converter is too high and the lamda is too low...any ideas what's my next step?


Comments

  • #2
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,196 ✭✭✭✭jimgoose


    What exactly are the readings?


  • #3
    Chirps92
    Registered Users, Registered Users 2 Posts: 4 ✭Chirps92


    jimgoose wrote: »
    What exactly are the readings?

    Don't have the exact piece of paper to hand but the Lamda was .79 and cat was 4.2 at high idle..


  • #4
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,196 ✭✭✭✭jimgoose


    Chirps92 wrote: »
    Don't have the exact piece of paper to hand but the Lamda was .79 and cat was 4.2 at high idle..

    By "cat" do you mean CO or HC?


  • #5
    Chirps92
    Registered Users, Registered Users 2 Posts: 4 ✭Chirps92


    jimgoose wrote: »
    By "cat" do you mean CO or HC?

    I mean CO

    Just found the exact readings:

    Low idle was 4.68...high was 7.72 and lamda was .79

    the hc was 547 ppm at low idle and 494 at high idle


  • #6
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,196 ✭✭✭✭jimgoose


    Chirps92 wrote: »
    I mean CO

    Just found the exact readings:

    Low idle was 4.68...high was 7.72 and lamda was .79

    the hc was 547 ppm at low idle and 494 at high idle

    That's running apesh1t rich. Check for vacuum leaks around the intake, as well as the MAP/MAF and coolant temperature sensor.


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