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NCT Emissions fail high idle lamba

  • 18-04-2015 3:27pm
    #1
    Curry Addict
    Registered Users, Registered Users 2 Posts: 1,274 ✭✭✭


    My 2.2 liter petrol car failed NCT Emissions for high idle lamba at 1.34. All the other readings are spot on.

    The tester suggested maybe a hole in the exhaust. So I checked that out today and no sign of any holes etc. It was hard to keep a rag in the tailpipe as the exhaust was so strong it kept blowing it out so that's a good sign.

    Also while checking it out i found a cable disconnect (see attached pic) Maybe the NCT tester forgot to reconnect it?? not sure they even disconnect cables?

    So I spent a couple of hours trying to find where it connects up to no avail. Any ideas appreciated!!! The car is a 2002 BMW E39.

    Also any ideas on the emissions fail and what can cause it?


Comments

  • #2
    cletus
    Registered Users, Registered Users 2 Posts: 8,190 ✭✭✭cletus


    Are you talking about the cable with the red and black plug in the picture?


  • #3
    Curry Addict
    Registered Users, Registered Users 2 Posts: 1,274 ✭✭✭Curry Addict


    cletus wrote: »
    Are you talking about the cable with the red and black plug in the picture?

    No its the one pointed out by the red lines. here is another pic that shows it better.


  • #4
    blackbox
    Registered Users, Registered Users 2 Posts: 4,709 ✭✭✭blackbox


    I'm not familiar with that particular car, but high lambda means too much oxygen in exhaust.

    If mixture was as lean as that reading suggests, car would be running badly with poor throttle response and low power.

    I used to have a Porsche that gave high lambda readings when running perfectly because of an air pump that was part of the emissions control - it pumped in air between the engine and cat to assist the cat. I think it was only supposed to pump when the engine was cold.


  • #5
    Curry Addict
    Registered Users, Registered Users 2 Posts: 1,274 ✭✭✭Curry Addict


    blackbox wrote: »
    I'm not familiar with that particular car, but high lambda means too much oxygen in exhaust.

    If mixture was as lean as that reading suggests, car would be running badly with poor throttle response and low power.

    I used to have a Porsche that gave high lambda readings when running perfectly because of an air pump that was part of the emissions control - it pumped in air between the engine and cat to assist the cat. I think it was only supposed to pump when the engine was cold.


    thanks for the insight


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