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failed nct on emissions.... advice on dipthane.

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    #32
    120_Minutes
    Registered Users Posts: 4,706 ✭✭✭120_Minutes


    GRRRR IT FAILED AGAIN!!!!

    I dont understand this, here are the full figures for the first failure:

    Engine/Oil temp: 85 C

    Low Idle (960 rpm) CO .18 % HC 148 ppm - PASS
    High Idle (3050 rpm) lambda: 1.02 CO .39% HC 84 ppm - FAIL

    and today:

    Engine/Oil temp 110 C (notice its higher)

    Low Idle (810 rpm, notice its lower) CO .29% (notice its higher???) 136ppm - PASS

    High Idle(2870 rpm, again lower) Lambda: 1.02 (the same) CO .36% HC 68ppm - FAIL

    This is with half a bottle of Dipthane in it since the last test. what the hell do i do?


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    #33
    Senna
    Registered Users Posts: 8,800 ✭✭✭Senna


    Did you add the Dipthane to a full tank, use it all up and refil it again or would there have been Dipthane in the tank at the time of the test?


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    #34
    120_Minutes
    Registered Users Posts: 4,706 ✭✭✭120_Minutes


    Senna wrote: »
    Did you add the Dipthane to a full tank, use it all up and refil it again or would there have been Dipthane in the tank at the time of the test?

    added a quarter bottle last week after a fill up. and same again this week.


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    #35
    Cosmo K
    Registered Users Posts: 985 ✭✭✭Cosmo K


    So you used Dipetane and your car still failed?! Surprise, surprise.....not!


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    #36
    120_Minutes
    Registered Users Posts: 4,706 ✭✭✭120_Minutes


    Cosmo K wrote: »
    So you used Dipetane and your car still failed?! Surprise, surprise.....not!

    what would you recommend then oh wise one?


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    #37
    ongarite
    Registered Users Posts: 8,241 ✭✭✭ongarite


    120_Minutes wrote: »
    what would you recommend then oh wise one?
    I think he would recommend bringing the car to a competent mechanic and get a proper assessment and diagnostics of the NCT fail rather than just throwing in dipthane and "sure that'll fix it right up"


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    #38
    Organic Cavity
    Registered Users Posts: 70 ✭✭Organic Cavity


    Or putting diptane in a half tank.


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    #39
    Nissan doctor
    Closed Accounts Posts: 8,223 ✭✭✭Nissan doctor


    120_Minutes wrote: »
    what would you recommend then oh wise one?


    Diptane does not repair faults.

    If your car has still failed then you need to have the problem diagnosed and repaired.


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    #40
    Leonard Hofstadter
    Registered Users Posts: 5,541 ✭✭✭Leonard Hofstadter


    Dipthane is not really that useful for petrol engines to be honest. The engine is still running lean (lambda is 1.02 instead of 1) - that needs to be corrected. That's why it's failing, and will continue to fail until that is addressed. Since it's not really out all that much, it suggests that it could be a very slight air leak of some description, perhaps a hole in the exhaust, but I'm no expert. This could be the one case where changing the cat might be enough to get it through, since everything else is more or less in spec, but again others would know better than me on that score.


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    #41
    C4Kid
    Registered Users Posts: 479 ✭✭C4Kid


    How do they gauge the Engine Oil temperature ?


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