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Smog Check Question and High HC

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  • #467763
    kzkevinkzkevin
    Participant

      Hi Eric,

      Can you do a video about like Emission Testing. Like High HC, High CO, or High NO?

      I tune up my 98 camry v6 before I took it to smog. Like genuine toyota parts. Spark plugs, Spark plugs wire, air filter, oil change, etc. It has high HC still but it passed smog. I dont think it will pass next year 2013. How can I bring down the HC numbers. I know it is unburnt fuel but Can Coil pack or the Ignition Coil go bad over time. I have no CEL. It has 129k on it.

      It wont let me attach the pdf.

      15mph Hc max ave meas 52 9 51 CO 0.49 0.02 0.04 NO 424 57 173
      25 MPHH MAX AVE MEAS 36 7 17 CO 0.46 0.03 0.06 NO 711 50 197

      15 mph % C02 is 15.1 %02 0
      25 mph % c02 15.1 %o2 0

      But like my sienna and 91 accord has the Co at 14.6 % and measured at 0.3 o2%

      If you like I can email u the report directly.

      I think a lot of people have this question.

      Attached is the smog check report. I also attached two other car they passed but how come the accord and sienna have o2% reading. Is that bad? What causes it?

      Thank you

    Viewing 5 replies - 1 through 5 (of 5 total)
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    • #467792
      college mancollege man
      Moderator

        yes a ignition coil can go bad.it may still work but
        may be putting out a weak spark. do you have a cel on?
        does the car run rough?

        #467824
        EricTheCarGuy 1EricTheCarGuy
        Keymaster

          I sort of have done a video on emissions testing with my friend ScannerDanner.

          #467941
          kzkevinkzkevin
          Participant

            No CEl. Car runs normal. Can I test the ignition coils. It is not those distributor ones its distributorless.
            Thanks

            #468029
            college mancollege man
            Moderator

              try doing a power balance test.

              #468091
              EricTheCarGuy 1EricTheCarGuy
              Keymaster

                If the car runs normal I wouldn’t worry about the ignition coils, if one of them was having an issue it would likely cause a misfire so lets put that on the shelf for now.

                The car and engine are old and worn out. As a result the HC emissions will be higher and there is little you can do about it other than replace or rebuild the engine. You might check the O2 sensor readings with a scan tool. With those older cars it allowed for a ‘slow’ sensor to stay in play whereas later models did not have such loose tolerances in their programming. If you watch the O2 sensor readings and you don’t see much fluctuation then perhaps it’s getting ‘slow’ and replacing it can improve HC emissions. If it’s got a rapid fluctuation then that would indicate it’s normal and doing it’s job and if that’s the case then as I stated your engine is probably worn and causing the higher than normal HC readings.

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