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plegmatik
New User

Sep 16, 2020, 2:05 AM

Post #1 of 6 (270 views)
  post locked   Vehicle inspection  

Hello everyone
cannot pass MOT due to the high level of CO (exhaust). Hyundai Sonata 2013 2.0 turbo.
Changed candles (New, by wine code)
I cleaned the throttle and tank.
Filled in new oil.
Installed a new catalyst ...
3 different diagnostics with computer - no errors at all.
MPG went from 22-23 to 18-19
After all these manipulations, the measurement is still above the permissible norm. I measured the CO several times, and each time the values ​​are very different - from slightly above the norm, to - significantly above the norm. I changed the lambda (first o2 sensor) twice (put both times used ones). On the tablet, during the lambda diagnostics, the values rapidly ​​changed from minus 2-3 to 5. Is this still a lambda?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 16, 2020, 3:33 AM

Post #2 of 6 (259 views)
  post locked   Re: Vehicle inspection  

CO is burned fuel so what you are looking for is an over rich mixture but not related to the ignition system.

First look at the mechanical condition of the engine. Do a complete compression test. Make sure the turbo isn't dumping excessive oil.
After that start looking for ways it can be getting over fueled or over oiled.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



plegmatik
New User

Sep 16, 2020, 3:57 AM

Post #3 of 6 (248 views)
  post locked   Re: Vehicle inspection  

Thank you sir. I will search problem where you point .


plegmatik
New User

Sep 16, 2020, 3:59 AM

Post #4 of 6 (246 views)
  post locked   Re: Vehicle inspection  


In Reply To
CO is burned fuel so what you are looking for is an over rich mixture but not related to the ignition system.

First look at the mechanical condition of the engine. Do a complete compression test. Make sure the turbo isn't dumping excessive oil.
After that start looking for ways it can be getting over fueled or over oiled.

There is one thing, oil pours out of the motor cover. Could it be the reason?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 16, 2020, 4:13 AM

Post #5 of 6 (240 views)
  post locked   Re: Vehicle inspection  

No, external leaks would not cause that but I would look a little deeper at the PCV system to determine if crankcase pressure could be causing both issues.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 16, 2020, 6:29 AM

Post #6 of 6 (227 views)
  post locked   Re: Vehicle inspection  

PCV would do it usually a reason hope not plain worn engine? There's supposed to be a vacuum however slight, in "crankcase" if pressure it pushes oils out weak spots like "valve covers" you didn't specify but up top says enough.
Clogged PCV or too much blow-by for it to handle a famous cause and bummer if so,


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