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plegmatik
New User
Sep 16, 2020, 2:05 AM
Post #1 of 6
(1509 views)
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Vehicle inspection
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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?
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 16, 2020, 3:33 AM
Post #2 of 6
(1498 views)
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Re: Vehicle inspection
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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.
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plegmatik
New User
Sep 16, 2020, 3:57 AM
Post #3 of 6
(1487 views)
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Re: Vehicle inspection
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Thank you sir. I will search problem where you point .
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 16, 2020, 4:13 AM
Post #5 of 6
(1479 views)
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Re: Vehicle inspection
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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.
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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.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 16, 2020, 6:29 AM
Post #6 of 6
(1466 views)
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Re: Vehicle inspection
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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,
T
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