Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Please note that it is not permitted to have referral links posted in your signature. Keep these links contained in the appropriate forum. Thank you.

https://www.boards.ie/discussion/2055940817/signature-rules
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

2007 Yaris failed NCT for emissions

  • 04-11-2018 10:10pm
    #1
    Jim79
    Registered Users, Registered Users 2 Posts: 221 ✭✭


    Hi,
    Yaris 1.0i failed for emissions please see report attached. the car is not smokey although i have noticed that the oil level has dropped since the oil change in july.My Question is does this report point to the 'cat' only?


Comments

  • #2
    toyotafan
    Users Awaiting Email Confirmation Posts: 137 ✭✭toyotafan


    Please see attached for HC/CO inspection extracted from the Toyota Technical Document so that you could have some information for your problem. I hope you will solve it soon.


  • #3
    rex-x
    Registered Users, Registered Users 2 Posts: 1,893 ✭✭✭rex-x


    Your HC are very high which means there is alot of unburnt fuel(or oil) going down the exhaust, combustion is poor. This is upping your CO level but if its been happening for a while now your cat may also be dead


  • #4
    Leonard Hofstadter
    Registered Users, Registered Users 2 Posts: 5,541 ✭✭✭Leonard Hofstadter


    CO and HC look OK at idle, surely if it was a problem with unburnt fuel or oil burning it would happen at all revs? It sounds like the cat may be going in this car.

    Oil burning would not cause a car to fail an NCT unless it's using so much you can see blue smoke coming out of the exhaust. Many modern cars burn oil and it's within the spec of most engines to use as much as a litre every 1000 km.


  • #5
    rex-x
    Registered Users, Registered Users 2 Posts: 1,893 ✭✭✭rex-x


    Leonard Hofstadter wrote: »
    CO and HC look OK at idle, surely if it was a problem with unburnt fuel or oil burning it would happen at all revs? It sounds like the cat may be going in this car.

    Oil burning would not cause a car to fail an NCT unless it's using so much you can see blue smoke coming out of the exhaust. Many modern cars burn oil and it's within the spec of most engines to use as much as a litre every 1000 km.

    The cat does not reduce HC, it may be the case it's gone now but a dead cat is not to route cause


  • #6
    mullingar
    Registered Users, Registered Users 2 Posts: 5,340 ✭✭✭mullingar


    High Co + High HC = running too rich, far too much fuel trying to burn in not enough oxygen = incomplete burn so loads of HC (hydrocarbons) and CO (Carbon monoxide)

    Its either not getting enough oxygen (air filter blocked), not a good enough spark, or ECU is over fuelling because of a faulty sensor.

    The 2 most important sensors for fuel control are the Lambda sensors (which monitors the remaining oxygen in the exhaust) and the MAF/MAP (measures the quantity of air going into the engine).


  • Advertisement
Advertisement