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  • emission testing

    I took my truck in to have it tested and it failed the hydrocarbon part. it tested 4.73 and the limit is 2.20. I know the
    o2 sensor is bad so I got a new one, the problem is I broke the old one trying to get it out. I'll try and get that later. After a little research though, that might not have been the issue anyway.
    Eventhough it passed the visual inspection of presence of a catalytic converter, it doesn't have one. The previous owner probably removed it because I didn't. So, my question is, is 4.73 HC a lot? Would some new spark plugs and a cap & rotor clean it up, or am I going to have to put a converter on it?
    On the CO test it had 13.50 and the limit is 55.00 and the NOx it had 2.10 with a limit of 3.50
    Thanks
    also boost will make the cam act smaller

  • #2

    Re: emission testing

    Yeah, I used to do a lot of smog work and yes, your HC is on the high side and could be for a variety of reasons. While a tune up wouldn't hurt, a missing converter is really going to drag you down, in terms of HC content. Another thing, believe it or not, a fresh oil change could help slightly as well.
    sigpic"Take most people, they're crazy about cars† I'd rather have a goddam horse. A horse is at least human, for God's sake."

    Jerome David Salinger

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    • #3

      Re: emission testing

      The O2 might clean it up enough to pass, but the missing cat is hurting across the board.
      Escaped on a technicality.

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      • #4

        Re: emission testing

        I'm finding that a converter can reduce HC by up to 90% but regulations only require it to operate at 70% efficiency. So I think a converter would really help. I just don't feel like doing that if there is an easier way. I just changed the oil not that long ago, maybe 900 miles. Does anyone have any idea what percentage a tune-up could account for?
        also boost will make the cam act smaller

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        • #5

          Re: emission testing

          Just get a few gallons of alcohol and pour it in the tank.....

          To bad it's fuel injected, if it had a carb and you could adjust the timing I could tell you a few things to do........My '71 Camaro when I used to drive it passed Emissions with 2% on the CO, and 61 HC and I didn't have cats............ And that was a 10.5:1 350 with a 300 duration cam.........

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          • #6

            Re: emission testing

            I've heard about people adding stuff to their tank, but a couple of gallons?
            For some reason I'd like to be in full compliance......but my goal is really to get my license plate re-newed.
            also boost will make the cam act smaller

            Comment


            • #7

              Re: emission testing

              CH3NO2 maybe?
              Last edited by BBR; April 13th, 2012, 11:59 AM.

              1973 F-250 460/C6 -Camper Special 1983 Mustang GT 545/C6 - 10.46 @ 130 - Drag Week 2012 - Street Race BB N/A runner-up

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              • #8

                Re: emission testing

                LOL, I didn't see on my sheet where they tested for nitric acid.
                also boost will make the cam act smaller

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                • #9

                  Re: emission testing

                  I've heard about people adding stuff to their tank, but a couple of gallons?
                  For some reason I'd like to be in full compliance......but my goal is really to get my license plate re-newed.
                  My friend had an 80's S10 the thing failed every year, he would put 3 gallons of Methanol or Ethanol in his tank with 10 gallons of gas and he'd go throw with flying colors.......... And I mean flying colors, it barely registered any readings.............

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                  • #10

                    Re: emission testing

                    I just got a new set of spark plugs, cap & rotor, and an air filter... I have a new set of wires that I'll use too. I might try to put something in the tank too, but 3 gallons per 10 gallons? I'm leaving next week and the place is closed on Mondays so it might be a little while until I can get back there.
                    also boost will make the cam act smaller

                    Comment


                    • #11

                      Re: emission testing

                      HC is usually the result of a misfire, high CO is running rich.

                      Put a converter on it and you'll probably fix it. But the tune up stuff is a good idea if it's been a long time. A flaky wire, half fouled or excessively worn spark plug, etc can make HC go up a bit like you're experiencing.

                      In the old days, it was fun to watch the needles on my 1970s Sun machine drop when the cat warmed up. 90% reduction in HC and CO is typical, sometimes more.
                      Last edited by squirrel; April 13th, 2012, 03:14 PM.
                      My fabulous web page

                      "If it don't go, chrome it!" --Stroker McGurk

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                      • #12

                        Re: emission testing

                        I just got a new set of spark plugs, cap & rotor, and an air filter... I have a new set of wires that I'll use too. I might try to put something in the tank too, but 3 gallons per 10 gallons? I'm leaving next week and the place is closed on Mondays so it might be a little while until I can get back there.
                        You might get away with using less, but that is how we did it...........Made lots of old Benz's pass that way......

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                        • #13

                          Re: emission testing

                          unplug an injector
                          go back.
                          without a cat it sounds raspy obnoxious anyway. what is a skip going to do?

                          Atomization is excitement, not temperature.

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                          • #14

                            Re: emission testing

                            HC is usually the result of a misfire, high CO is running rich.

                            Put a converter on it and you'll probably fix it. But the tune up stuff is a good idea if it's been a long time. A flaky wire, half fouled or excessively worn spark plug, etc can make HC go up a bit like you're experiencing.

                            In the old days, it was fun to watch the needles on my 1970s Sun machine drop when the cat warmed up. 90% reduction in HC and CO is typical, sometimes more.
                            I changed the plugs and they all came out with a white chalk on them, the cap and rotor where a different story though. The rotor was so worn that it was noticably shorter than the new one and the termanials in the cap had a lot of build up on them.
                            also boost will make the cam act smaller

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                            • #15

                              Re: emission testing

                              I changed the plugs and they all came out with a white chalk on them, the cap and rotor where a different story though. The rotor was so worn that it was noticably shorter than the new one and the termanials in the cap had a lot of build up on them.
                              white chalk..
                              how is the intake gasket.
                              Atomization is excitement, not temperature.

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